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Microsoft
String

String

Overall Progress0/103(0%)

Easy

0/22

Medium

0/57

Hard

0/24

Longest Substring Without Repeating Characters

Medium

Longest Palindromic Substring

Medium

Valid Parentheses

Easy

Generate Parentheses

Medium

Medium

Letter Combinations of a Phone Number

Medium

Longest Common Prefix

Easy

Minimum Window Substring

Hard

Medium

Medium

Medium

Roman to Integer

Easy

Longest Common Subsequence

Medium

Easy

Find All Anagrams in a String

Medium

Regular Expression Matching

Hard

Hard

Medium

Permutation in String

Medium

Implement Trie (Prefix Tree)

Medium

Palindromic Substrings

Medium

Serialize and Deserialize Binary Tree

Hard

Valid Palindrome

Easy

Remove K Digits

Medium

Hard

Evaluate Division

Medium

First Unique Character in a String

Easy

Medium

Reverse Words in a String

Medium

Easy

Reorganize String

Medium

Wildcard Matching

Hard

Valid Palindrome II

Easy

Interleaving String

Medium

Zigzag Conversion

Medium

Top K Frequent Words

Medium

Integer to Roman

Medium

Hard

Multiply Strings

Medium

Medium

Remove All Adjacent Duplicates In String

Easy

Basic Calculator

Hard

Basic Calculator II

Medium

Hard

Different Ways to Add Parentheses

Medium

Remove All Adjacent Duplicates in String II

Medium

Medium

Excel Sheet Column Title

Easy

String Compression

Medium

Restore IP Addresses

Medium

Easy

Easy

Shortest Common Supersequence

Hard

Minimum Deletions to Make Character Frequencies Unique

Medium

String to Integer (atoi)

Medium

Time Based Key-Value Store

Medium

Alien Dictionary

Hard

Maximum Length of a Concatenated String with Unique Characters

Medium

Shortest Palindrome

Hard

Easy

Medium

Find and Replace Pattern

Medium

Text Justification

Hard

Integer to English Words

Hard

Serialize and Deserialize BST

Medium

Number of Substrings Containing All Three Characters

Medium

Easy

Longest Substring with At Most K Distinct Characters

Medium

Minimum Number of Steps to Make Two Strings Anagram

Medium

Compare Version Numbers

Medium

Letter Tile Possibilities

Medium

Find the Longest Substring Containing Vowels in Even Counts

Medium

Count Unique Characters of All Substrings of a Given String

Hard

Design Search Autocomplete System

Hard

Minimum Deletions to Make String Balanced

Medium

Encode and Decode TinyURL

Medium

Number of Atoms

Hard

Consecutive Characters

Easy

Maximum Number of Balloons

Easy

Design In-Memory File System

Hard

Encode and Decode Strings

Medium

Longest Nice Substring

Easy

Shortest Word Distance

Easy

Find the Closest Palindrome

Hard

Count Substrings That Differ by One Character

Medium

Reverse Words in a String II

Medium

Palindrome Permutation

Easy

Serialize and Deserialize N-ary Tree

Hard

Validate IP Address

Medium

The k-th Lexicographical String of All Happy Strings of Length n

Medium

Rearrange String k Distance Apart

Hard

Strong Password Checker

Hard

Palindrome Permutation II

Medium

Number of Ways to Split a String

Medium

Largest Time for Given Digits

Medium

Remove Comments

Medium

Strobogrammatic Number

Easy

Replace All ?'s to Avoid Consecutive Repeating Characters

Easy

Generate a String With Characters That Have Odd Counts

Easy

Making File Names Unique

Medium

Hard

Minimize Rounding Error to Meet Target

Medium

Equal Rational Numbers

Hard

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