Strings — Practice Problems

Total

Solved

48%

Complete

Easy

Medium

Hard

easy · 9

#3Longest Substring Without Repeating Characters✓
mediumarrayssliding windowstrings
Solution
#5Longest Palindromic Substring✓
mediumstringstwo pointers
#17Letter Combinations of a Phone Number○
mediumbacktrackingstrings
#22Generate Parentheses○
mediumbacktrackingstrings
#49Group Anagrams✓
mediumstringshashing
#72Edit Distance○
mediumdynamic programmingstrings
#139Word Break○
mediumdynamic programmingstrings
#271Encode and Decode Strings✓
mediumstrings
Editorial Approach
#424Longest Repeating Character Replacement✓
mediumarrayssliding windowstrings
#567Permutation in String✓
mediumarrayssliding windowstrings
#647Palindromic Substrings○
mediumstringstwo pointers
#1143Longest Common Subsequence○
mediumdynamic programmingstrings

#68Text Justification✓
hardstrings
Approach
#76Minimum Window Substring✓
hardarrayssliding windowstrings
#127Word Ladder○
hardgraphsstrings
#340Longest Substring with At Most K Distinct Characters○
hardarrayssliding windowstrings