# Status Problem video Level Completes Likes 522 Check If Student is eligible for an Attendance Reward Beginner % 0 519 Random character in a given string - Java Beginner % 0 503 Minimum Deletions to make the occurrence of each character unique. Hard % 1 499 Compare two version numbers of a software Medium % 1 496 Minimum number of times String A is repeated to such that B is substring of A Beginner % 1 483 Find Lexicographically smallest or largest substring of size k Beginner % 0 482 Largest word in dictionary by removing a few characters from the given string Beginner % 0 480 Check if one string is a subsequence of another string. Beginner % 0 467 Print all steps to convert one string to another string Medium % 0 437 Lexicographically previous permutation With One swap Medium % 1 415 Hamming Distance between two given strings Beginner % 0 394 Find the maximum number present in a String Beginner % 0 390 Convert Prefix to Postfix Expression Medium % 0 387 Convert Postfix to Prefix Expression Medium % 0 386 Convert Integer to Roman Medium % 0 385 String to Integer (AtoI - ASCII to Integer) - Recursive Solution Medium % 0 378 Longest contiguous character in a given String - O(N) Solution Beginner % 0 377 Convert Postfix to Infix Expression Medium % 0 375 String to Integer (AtoI - ASCII to Integer) Beginner % 1 373 Longest substring with at most two unique characters Medium % 0 371 Convert Infix to Prefix Expression Medium % 0 369 Find duplicates Characters in the given String Beginner % 0 365 Convert Infix to Postfix Expression Medium % 0 363 Evaluation of Infix expressions Medium % 0 361 Convert Prefix to Infix Expression Medium % 0 358 Infix, Postfix and Prefix Notations/Expressions Beginner % 0 354 Valid Multiple Parentheses Medium % 1 346 Valid Brackets – Part 2 | Stack Method Beginner % 0 344 Given two strings validate the output string Beginner % 0 343 Generate all the strings of length n from 0 to k-1 Medium % 0 331 Find Largest and Smallest word in a given String Beginner % 0 323 How to Reverse Text: Stack Method for String Reversal Beginner % 0 313 Check if two Strings are equal without using built-in function Beginner % 0 312 Remove Vowels from a given String Beginner % 0 305 Find number of Distinct Permutations of a String Medium % 0 Check If Student is eligible for an Attendance Reward Random character in a given string - Java Minimum Deletions to make the occurrence of each character unique. Compare two version numbers of a software Minimum number of times String A is repeated to such that B is substring of A Find Lexicographically smallest or largest substring of size k Largest word in dictionary by removing a few characters from the given string Check if one string is a subsequence of another string. Print all steps to convert one string to another string Lexicographically previous permutation With One swap Hamming Distance between two given strings Find the maximum number present in a String Convert Prefix to Postfix Expression Convert Postfix to Prefix Expression Convert Integer to Roman String to Integer (AtoI - ASCII to Integer) - Recursive Solution Longest contiguous character in a given String - O(N) Solution Convert Postfix to Infix Expression String to Integer (AtoI - ASCII to Integer) Longest substring with at most two unique characters Convert Infix to Prefix Expression Find duplicates Characters in the given String Convert Infix to Postfix Expression Evaluation of Infix expressions Convert Prefix to Infix Expression Infix, Postfix and Prefix Notations/Expressions Valid Multiple Parentheses Valid Brackets – Part 2 | Stack Method Given two strings validate the output string Generate all the strings of length n from 0 to k-1 Find Largest and Smallest word in a given String How to Reverse Text: Stack Method for String Reversal Check if two Strings are equal without using built-in function Remove Vowels from a given String Find number of Distinct Permutations of a String 1 2