# Status Problem video Level Completes Likes 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 % 0 296 Replace all vowels with next consonant in a given string Medium % 0 290 Reverse a String using Recursion Beginner % 0 288 Print maximum occurring character in a String Beginner % 0 263 Minimum Copy Paste Operations Medium % 0 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 Replace all vowels with next consonant in a given string Reverse a String using Recursion Print maximum occurring character in a String Minimum Copy Paste Operations 1 2 3
