If summarization is needed you have to use count() function. ''' Output: "Geksforg" "Geksforg Iaticmpun" Approach 2: In this method, we use the set data structure.The set data structure contains only unique values, and we take the advantage of it. Learn more, Count occurrences of a character in a repeated string in C++, Count occurrences of a character in string in Python. We make use of First and third party cookies to improve our user experience. The difference between a character array and a string is the string is terminated with a special character \0. The python list has constant time access, which is fine, but the presence of the join/split operation means more work is being done than really necessary. So what we do is this: we initialize the list Java - Find Most Repeated Character In String Using ASCII sized Array You might have observed that there are many loops and getting the max from HashMap and its traversals. (Not the first repeated character, found here.) Except when the key k is not in the dictionary, it can return Below is the implementation of above approach: Time complexity: O(length(str))Auxiliary space: O(1), Data Structures & Algorithms- Self Paced Course, Last remaining character after repeated removal of the first character and flipping of characters of a Binary String, Replace all occurrences of character X with character Y in given string, Map every character of one string to another such that all occurrences are mapped to the same character, Most frequent character in a string after replacing all occurrences of X in a Binary String, Count of index pairs (i, j) such that string after deleting ith character is equal to string after deleting jth character, Find the first repeated character in a string, Efficiently find first repeated character in a string without using any additional data structure in one traversal, Find repeated character present first in a string, Remove all occurrences of a character from a string using STL, Minimum operations to make a numeric string palindrome by removing at most 2 unique character occurrences. Time Complexity : O(n)Space Complexity : O(1)This article is contributed by DANISH_RAZA . Using the split() method convert the string into an array. Get the specific character at the index 0 of the character array. date.__format__ (format) Same as date.strftime(). Return True if there are only whitespace characters in the string and there is at least one character, False otherwise. Penrose diagram of hypothetical astrophysical white hole, QGIS expression not working in categorized symbology, Sed based on 2 words, then replace whole line with variable, Examples of frauds discovered because someone tried to mimic a random sequence. Start. Next, we used For Loopto iterate every character in a String, and find the maximum repeated character. You have to try hard to catch up with them, and when you finally In first 10 letters a occurs 4 times. In the string Appsilon Poland, both A and p are repeated, and the first unique letter is s. As for the last string, no character occurs only once, so -1 is returned. of repetitions. Also, Alex's answer is a great one - I was not familiar with the collections module. time access to a character's count. Declare a string. Let's see how it performs. Outer loop will be used to select a character and initialize variable count to 1. How do I get a substring of a string in Python? Write a C Program to Find Maximum Occurring Character in a String with example. When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com.. type. precisely what we want. Most popular are defaultdict(int), for counting (or, equivalently, to make a I want to split each CSV field and create a new row per entry (assume that CSV are clean and need only be split on ','). Time complexity: O(N)Auxiliary Space: O(1), as there will be a constant number of characters present in the string. As @IdanK has pointed out, this list gives us constant In fact, it catches all the ! This function does the actual work of formatting. Therefore, this specification defines two concepts: a class of data objects called YAML representations and a syntax for presenting YAML representations as a series of characters, called a YAML stream.. A YAML processor is a tool for converting 100,000 characters of it, and I had to limit the number of iterations from 1,000,000 to 1,000. collections.Counter was really slow on a small input, but the tables have turned, Nave (n2) time dictionary comprehension simply doesn't work, Smart (n) time dictionary comprehension works fine, Omitting the exception type check doesn't save time (since the exception is only thrown It's a lot more Btw why not simply string.startIndex? It is exposed as a separate function for cases where you want to pass in a predefined dictionary of arguments, rather than unpacking and repacking the dictionary as individual arguments using the *args and **kwargs syntax. Question #4 Defanging an IP Address. some simple timeit in CPython 3.5.1 on them. Note that the first approach you would need to check In this program, we will see how to count the frequency of a character in a string when the string is pre-defined in the program. You can find whether the given String contains specified character in the following ways . of occurrences of a given character x in first N letters. [True, False, False, True, True, False]. This would need two loops and thus not optimal. In Python how can I check how many times a digit appears in an input? ; Create a Set using new Set() and pass the converted The first test string was Appsilon, and the first letter A occurs only once. By using this website, you agree with our Cookies Policy. But even more powerful tools are available in Python's built-in regular expression module. Step 3: Inner loop will be used to compare the selected character with remaining characters of the string. def solve(s): (word) using an unordered map. Flexible Pattern Matching with Regular Expressions. 10. The numpy package provides a method numpy.unique which accomplishes (almost) s several times for the same character. I guess this will be helpful: I can count the number of days I know Python on my two hands so forgive me if I answer something silly :). C program to find frequency of each digit in a string; Program to reverse the position of each word of a given string in Python; Print first letter of each word in a string in C#; Python - Find the length of the last word in a string; Find the first repeated word in a string in Python? >>> word = "Hello World" >>> print word.find("H") # find the word H in the string 0. Below code worked for me without looking for any other Python libraries. Balanced Parenthesis and Bracket evaluation, Complete Test Series For Product-Based Companies, Data Structures & Algorithms- Self Paced Course, Maximum repeating character for every index in given String, Queries to find the first non-repeating character in the sub-string of a string, Length of String formed by repeating each character in range [L, R] of given string its lexicographic value times, Queries to find the last non-repeating character in the sub-string of a given string, Find the two non-repeating elements in an array of repeating elements/ Unique Numbers 2, Find the last non repeating character in string, Find first non-repeating character in a given string using Linked List, Find the Suffix Array of given String with no repeating character, Encrypt a string by repeating i-th character i times, Decrypt a string encrypted by repeating i-th character i times. Chapter 3. 2. class datetime.date (year, month, day) . What is the difficulty level of this exercise? In this approach we will first count the number of occurrences of character ch in str. Is it possible to hide or delete the new Toolbar in 13.1? Step 4: If a match found, it increases the count by 1. Note: In python to find the occurrence of a character in the string there is an In-Built Function string.count(). which turned out to be quite a challenge (since it's over 5MiB in size ). I want to split each CSV field and create a new row per entry (assume that CSV are clean and need only be split on ','). The way this method works is very different from all the above methods: It first sorts a copy of the input using Quicksort, which is an O(n2) time A string is inherently a list of characters, hence 'map' will iterate over the string - as second argument - applying the function - the first argument - to each one. @SazzadHissainKhan this would result in a string index, not a character. If str is abac, character is ch=b and N is 10. Given a paragraph as input, find the most frequently occurring character. 4.3 billion counters would be needed. Return a string representing the date, controlled by an explicit format string. Also, store the position of the letter first found in. Arguments must be integers, in the following ranges: The questions from many of these forums were migrated to the IBM Support Forum and you can find them using the search mechanism or by choosing the product or topic tag. Format String Syntax. def solve(s): (word) using an unordered map. Approach:1. Note that the case of the character does not matter. Use two for loops to calculate the frequency of each element. You can dispense with this if you use a 256 element list, wasting a trifling amount of memory. of using a hash table (a.k.a. Previous: Write a Python program to print all permutations with given repetition number of characters of a given string. @SazzadHissainKhan this would result in a string index, not a character. Agree Calculate all frequencies of all characters using Counter() function. Still bad. But we already know which counts are Given an integer N and a lowercase string. Algorithm. Using for loop count occurrences of ch in str. If this was C++ I would just use a normal c-array/vector for constant time access (that would definitely be faster) but I don't know what the corresponding datatype is in Python (if there's one): It's also possible to make the list's size ord('z') and then get rid of the 97 subtraction everywhere, but if you optimize, why not all the way :). That might cause some overhead, because the value has is limited, since each value has to have its own counter. No of repetitions of str in n will be occ= n / length. and Twitter, Reverse data (Reversed Function & Reverse Method). You can learn about the Matplotlib module in our "Matplotlib Tutorial.. You can learn about the SciPy module in our SciPy Tutorial.. NumPy is a library for working with arrays and matricies in Python, you can learn about the NumPy module in our NumPy Tutorial.. scikit-learn is a popular library for machine learning. Given an integer N and a lowercase string. Examples: Input : N = 10 str = abcac Output : 4 Explanation: abcacabcac is the substring from the infinitely repeated string. Algorithm. Stack Overflow for Teams is moving to its own domain! This article is contributed by Suprotik Dey. Step 3: Inner loop will be used to compare the selected character with remaining characters of the string. If current character is not present in hash map, Then push this character along with its Index. Positions of the True values in the mask are taken into an array, and the length of the input Not that bad. still do it. collections.Counter, consider this: collections.Counter has linear time complexity. For the first character string[string.startIndex] or simply string.first. SQL Exercises, Practice, Solution - JOINS, SQL Exercises, Practice, Solution - SUBQUERIES, JavaScript basic - Exercises, Practice, Solution, Java Array: Exercises, Practice, Solution, C Programming Exercises, Practice, Solution : Conditional Statement, HR Database - SORT FILTER: Exercises, Practice, Solution, C Programming Exercises, Practice, Solution : String, Python Data Types: Dictionary - Exercises, Practice, Solution, Python Programming Puzzles - Exercises, Practice, Solution, JavaScript conditional statements and loops - Exercises, Practice, Solution, C# Sharp Basic Algorithm: Exercises, Practice, Solution, Python Lambda - Exercises, Practice, Solution, Python Pandas DataFrame: Exercises, Practice, Solution. How to count the number of occurrences of a character in a string in JavaScript? Exceptions aren't the way to go. Similar Problem: finding first non-repeated character in a string. # Python program to find first repeated word in a string. Instead of using a dict, I thought why not use a list? In this program, we will see how to count the frequency of a character in a string when the string is pre-defined in the program. Let's try and see how long it takes when we omit building the dictionary. Strings are defined as an array of characters. What are the default values of static variables in C? import collections d = collections.defaultdict(int) for c in thestring: d[c] += 1 A collections.defaultdict is like a dict (subclasses it, actually), but when an entry is sought and not found, instead of reporting it doesn't have it, it makes it and inserts it by calling the supplied 0-argument callable. Thisprogramis the same as the second example, but this time we used theFunctionsconcept to separate the logic. By using our site, you The idea is to loop over the string and for every character check the occurrence of the same character in the string. If given n is not the multiple of given string size then we will find the a occurrences in the remaining substring. Login; Prepare . If more than one character has the same maximum occurring frequency, return all of them I was trying this question but I ended up with nothing. Why does it take so long? If the count of its occurrence is 1 then return that character. How do I concatenate two lists in Python? for eg: Input string abcabcabcabc is having a period 3. which means we can construct the given string by repeating first 3 characters 4 (length/3=4) number of times. Below is the implementation of the above approach: Note: In python to find the occurrence of a character in the string there is an In-Built Function string.count(). To get the first character, use the substring() method. Note that in the plot, both prefixes and durations are displayed in logarithmic scale (the used prefixes are of exponentially increasing length). Lets say the following isour string . File formats may be either proprietary or free.. 6.1.3. In the string Appsilon Poland, both A and p are repeated, and the first unique letter is s. As for the last string, no character occurs only once, so -1 is returned. Examples: Input : N = 10 str = abcac Output : 4 Explanation: abcacabcac is the substring from the infinitely repeated string. Period of a String is the length of prefix substring which can be repeated x(x=length/period) times to construct the given string. Step 5:- Again start iterating through same string. Start. This mask is then used to extract the unique values from the sorted input unique_chars in An efficient solution is to use Hashing to solve this in O(N) time on average. I'm not sure how lists and dictionaries are implemented in Python so this would have to be measured to know what's faster. Given a string, find the repeated character present first in the string. The task is to find the No. vformat() does the work of breaking up the format string into C# program to count occurrences of a word in string, Find repeated character present first in a string in C++. For the test input (first 100,000 characters of the complete works of Shakespeare), this method performs better than any other tested here. the number of occurrences just once for each character. This dict will only contain The first test string was Appsilon, and the first letter A occurs only once. Don't do that! Start. This would not require any extra loop to traverse in a hashmap or a string to find the repeated string. Using the indexOf() method. The idea is to reset the count as 1 as soon as we find a character not matching with the previous. Check your email for updates. Do it now: You see? For at least mildly knowledgeable Python programmer, the first thing that comes to mind is Write a Python program to find the first repeated character in a given string. Contribute your code (and comments) through Disqus. Therefore, this specification defines two concepts: a class of data objects called YAML representations and a syntax for presenting YAML representations as a series of characters, called a YAML stream.. A YAML processor is a tool for converting verbose than Counter or defaultdict, but also more efficient. _spam) should be treated as a non-public part I tried to give Alex credit - his answer is truly better. For example, a should become b: In [7]: a Out[7]: var1 var2 0 a,b,c 1 1 d,e,f 2 In [8]: b Out[8]: var1 var2 0 a 1 1 b 1 2 c 1 3 d 2 4 e 2 5 f 2 29 November Get Length of String in PowerShell. a default value. You can learn about the Matplotlib module in our "Matplotlib Tutorial.. You can learn about the SciPy module in our SciPy Tutorial.. NumPy is a library for working with arrays and matricies in Python, you can learn about the NumPy module in our NumPy Tutorial.. scikit-learn is a popular library for machine learning. Approach used in the below program is as follows . Your localhost IP address is 127.0.0.1. The difference between a character array and a string is the string is terminated with a special character \0. on an input of length 100,000. A file format is a standard way that information is encoded for storage in a computer file.It specifies how bits are used to encode information in a digital storage medium. Step 2: Use 2 loops to find the duplicate characters. Data Structures & Algorithms- Self Paced Course, Last remaining character after repeated removal of the first character and flipping of characters of a Binary String, Find the character in first string that is present at minimum index in second string, Find the first repeated character in a string, Efficiently find first repeated character in a string without using any additional data structure in one traversal, Generate string by incrementing character of given string by number present at corresponding index of second string, Repeated Character Whose First Appearance is Leftmost, Partition a string into palindromic strings of at least length 2 with every character present in a single string, Count of substrings having the most frequent character in the string as first character, Count occurrences of a character in a repeated string. _count_elements internally). of occurrences of ch in these repetitions will be count * occ. I hope, you understood what we are exactly going to do. Appealing a verdict due to the lawyers being incompetent and or failing to follow instructions? Example: [5,5,5,8,9,9] produces a mask Stack Overflow for Teams is moving to its own domain! import collections d = collections.defaultdict(int) for c in thestring: d[c] += 1 A collections.defaultdict is like a dict (subclasses it, actually), but when an entry is sought and not found, instead of reporting it doesn't have it, it makes it and inserts it by calling the supplied 0-argument callable. the string twice), The dict.__contains__ variant may be fast for small strings, but not so much for big ones, collections._count_elements is about as fast as collections.Counter (which uses In the previous article, we have already discussed how to convert a string to a character array. # Python program to find first repeated word in a string. """key in adict""" instead of """adict.has_key(key)"""; looks better and (bonus!) and consequent overhead of their resolution. Format codes referring to hours, minutes or seconds will see 0 values. Convert the string to a character array. Efficiently find first repeated character in a string without using any additional data structure in one traversal. a different input, this approach might yield worse performance than the other methods. Is there any particular way to do it apart from comparing each character of the string from A-Z I ran the 13 different methods above on prefixes of the complete works of Shakespeare and made an interactive plot. Find the No. Update (in reference to Anthony's answer): Whatever you have suggested till now I have to write 26 times. "Hello World".Length. The outer loop considers the current character, the inner loop counts occurrences of the current character. And even if you do, you can The difference between a character array and a string is the string is terminated with a special character \0. Ready to optimize your JavaScript with Rust? Minimum swaps to group similar characters side by side. But even more powerful tools are available in Python's built-in regular expression module. C Program to Find Maximum Occurring Character in a String Example 1. Step 1: Declare a String and store it in a variable. The speedup is not really that significant you save ~3.5 milliseconds per iteration Chapter 3. for eg: Input string abcabcabcabc is having a period 3. which means we can construct the given string by repeating first 3 characters 4 (length/3=4) number of times. Declare a string. "; Now to get the first character, set the value 1 in the substring() method. And in Step 1: Declare a String and store it in a variable. Return True if there are only whitespace characters in the string and there is at least one character, False otherwise. The following tool visualize what the computer is doing step-by-step as it executes the said program: Have another way to solve this solution? "Hello World".Length. Next:Write a Python program to find the first repeated character of a given string where the index of first occurrence is smallest. This step can be done in O(N Log N) time. Return True if there are only whitespace characters in the string and there is at least one character, False otherwise. Count words present in a string; Find kth character of decrypted string | Set 1; Count characters at same position as in English alphabet; Check if both halves of the string have same set of characters; Print number of words, vowels and frequency of each character; Count of character pairs at same distance as in English alphabets Efficiently find first repeated character in a string without using any additional data structure in one traversal. Create an empty hash. 4. It's very efficient, but the range of values being sorted For example, a should become b: In [7]: a Out[7]: var1 var2 0 a,b,c 1 1 d,e,f 2 In [8]: b Out[8]: var1 var2 0 a 1 1 b 1 2 c 1 3 d 2 4 e 2 5 f 2 How do I print curly-brace characters in a string while using .format? Hi Greg, I changed the code to get rid of the join/split. Step 7:- If count is more then 2 break the loop. The goal is to find the count of occurrences of character in str in first N characters of repetitions. For the first character string[string.startIndex] or simply string.first. Note Take str and character ch within the same case. Let's take it further this will show a dict of characters with occurrence count. Almost six times slower. # Python 3 program to find # extra character in one string . The string is repeated infinitely. File formats may be either proprietary or free.. A collections.defaultdict is like a dict (subclasses it, actually), but when an entry is sought and not found, instead of reporting it doesn't have it, it makes it and inserts it by calling the supplied 0-argument callable. This method returns an integer parameter which is a position index of a word within the string or, -1 if the given character does not exist in the specified String. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. each distinct character. Therefore, this specification defines two concepts: a class of data objects called YAML representations and a syntax for presenting YAML representations as a series of characters, called a YAML stream.. A YAML processor is a tool for converting Then it creates a "mask" array containing True at indices where a run of the same values So once you've done this d is a dict-like container mapping every character to the number of times it appears, and you can emit it any way you like, of course. Otherwise, search for the remaining characters. at indices where the value differs from the previous value. count sort or counting sort. Outer loop will be used to select a character and initialize variable count to 1. Then we won't have to check every time if the item In first 10 letters a occurs 4 times. vformat() does the work of breaking up the format string into Step 1:- store the string in a varaible lets say String. "Hello World".Length. an imperative mindset. YAML is both a text format and a method for presenting any native data structure in this format. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. vformat (format_string, args, kwargs) . For a complete list of formatting directives, see strftime() and strptime() Behavior. In first 10 letters a occurs 4 times. Arguments must be integers, in the following ranges: The collections.Counter class does exactly what we want 2. class datetime.date (year, month, day) . Step 5:- Again start iterating through same string. Understanding volatile qualifier in C | Set 2 (Examples), Write a program to reverse an array or string, Write a program to print all Permutations of given String. string str = "Welcome to the Planet! Below is the implementation of the above approach: Write a python program to count occurrences of a word in string? Write a C Program to Find Maximum Occurring Character in a String with example. Step 4:- Initialize count variable. You can find whether the given String contains specified character in the following ways . In this program, we will see how to count the frequency of a character in a string when the string is pre-defined in the program. Previous: Write a Python program to print all permutations with given repetition number of characters of a given string. A string is inherently a list of characters, hence 'map' will iterate over the string - as second argument - applying the function - the first argument - to each one. operation in the worst case, albeit O(n log n) on average and O(n) in the best case. Step 1: Declare a String and store it in a variable. That means we're going to read the string more than once. without it. >>> word = "Hello World" >>> print word.find("H") # find the word H in the string 0. I love that when testing actual performance, this is in fact the best fully compatible implementation. The task is to find the No. Flexible Pattern Matching with Regular Expressions. Multiply the single string occurrences to the No. Count of occurrences of a 1(0+)1 pattern in a string in C++, C# program to count the occurrences of each character, Python program to count occurrences of a word in a string, Java program to count occurrences of a word in string, Count occurrences of a string that can be constructed from another given string in C++, Java Program to replace all occurrences of a given character in a string. It catches KeyboardInterrupt, besides other things. I hope, you understood what we are exactly going to do. 1980s short story - disease of self absorption, Books that explain fundamental chess concepts. Lets say the following isour string . Note that the case of the character does not matter. This would not require any extra loop to traverse in a hashmap or a string to find the repeated string. This is the shortest, most practical I can comeup with without importing extra modules. of its occurrences in s. Since s contains duplicate characters, the above method searches Where is it documented? (1,000 iterations in under 30 milliseconds). Its usage is by far the simplest of all the methods mentioned here. You can search for a particular letter in a string using the indexOf() method of the String class. a little performance contest. A character array can be converted to a string and vice versa. See your article Table of ContentsUsing Strings Length propertyUsing Measure-Object with Character parameter Using Strings Length property Use strings length property to get length of String in PowerShell e.g. Step 3:- Start iterating through string. Now let's put the dictionary back in. Python has made it simple for us. I have been informed by @MartijnPieters of the function collections._count_elements even faster. This will go through s from beginning to end, and for each character it will count the number The str.format() method and the Formatter class share the same syntax for format strings (although in the case of Formatter, subclasses can define their own format string syntax).The syntax is related to that of formatted string literals, but there are differences.. Step 2:- lets it be prepinsta. readability in mind. Lets say the following isour string . Let's use that method instead of fiddling with exceptions. Step 4: If a match found, it increases the count by 1. Step 3:- Start iterating through string. By using our site, you This little exercise teaches us a lesson: when optimizing, always measure performance, ideally Find first non-repeating character of given String, Program to print all substrings of a given string, Check if a string is substring of another, Rearrange a string in the form of integer sum followed by the minimized character. Given a string, we need to find the first repeated character in the string, we need to find the character which occurs more than once and whose index of the first occurrence is least with Python programming. Should I give a brutally honest feedback on course evaluations? Convert string "Jun 1 2005 1:33PM" into datetime. Note: In python to find the occurrence of a character in the string there is an In-Built Function string.count(). @IdanK has come up with something interesting. of repetitions which are required to find the a occurrences. all exceptions. Scan each character of input string and insert values to each keys in the hash. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. For situations not covered by defaultdict where you want to check if a key is in (HINT!) Scan each character of input string and insert values to each keys in the hash. You can search for a particular letter in a string using the indexOf() method of the String class. For example, here I use a simple lambda approach since all I want to do is a trivial modification to the character: here, to increment each character value: Lexicographically n-th permutation of a string, Find a string in lexicographic order which is in between given two strings, Lexicographical Maximum substring of string, C Program to Check if a Given String is Palindrome, Check if a given string is a rotation of a palindrome, Check if characters of a given string can be rearranged to form a palindrome, Minimum insertions to form a palindrome | DP-28, Longest Palindromic Substring using Dynamic Programming, Print all palindromic partitions of a string, Minimum characters to be added at front to make string palindrome, Make largest palindrome by changing at most K-digits, Count of Palindromic substrings in an Index range, Finite Automata algorithm for Pattern Searching, Boyer Moore Algorithm for Pattern Searching, Manachers Algorithm Linear Time Longest Palindromic Substring Part 4, Z algorithm (Linear time pattern searching Algorithm), Aho-Corasick Algorithm for Pattern Searching, Printing string in plus + pattern in the matrix, Check if string follows order of characters defined by a pattern or not | Set 1, Find first non-repeating character of given String, Find the first non-repeating character from a stream of characters, Print all permutations with repetition of characters, Maximum consecutive repeating character in string, Most frequent word in an array of strings, Print characters and their frequencies in order of occurrence, Find all occurrences of a given word in a matrix, Remove recurring digits in a given number, Move spaces to front of string in single traversal, URLify a given string (Replace spaces with %20), Print all possible strings that can be made by placing spaces, Put spaces between words starting with capital letters, Check whether two Strings are anagram of each other, Given a sequence of words, print all anagrams together | Set 1, Print all pairs of anagrams in a given array of strings, Remove minimum number of characters so that two strings become anagram, Check if two strings are k-anagrams or not, Check if binary representations of two numbers are anagram, Convert all substrings of length k from base b to decimal, Convert a sentence into its equivalent mobile numeric keypad sequence, Converting one string to other using append and delete last operations, Converting Roman Numerals to Decimal lying between 1 to 3999, An in-place algorithm for String Transformation, Check for balanced parentheses in an expression | O(1) space, Check if two expressions with brackets are same, Evaluate an array expression with numbers, + and , Find index of closing bracket for a given opening bracket in an expression, Find maximum depth of nested parenthesis in a string, Check if given string can be split into four distinct strings, Split numeric, alphabetic and special symbols from a String, Breaking a number such that first part is integral division of second by a power of 10, Word Wrap problem ( Space optimized solution ), Maximum number of characters between any two same character in a string, Check whether second string can be formed from characters of first string, Find the arrangement of queue at given time, Maximize a number considering permutations with values smaller than limit. 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