Arrays — Practice Problems

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36%

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Easy

Medium

Hard

All problems →← Back to Arrays

easy · 8

#1Two Sum○
easyhashingarrays
#88Merge Sorted Array✓
easysearching sortingarraystwo pointers
Solution
#121Best Time to Buy and Sell Stock✓
easyarrayssliding window
#125Valid Palindrome✓
easyarraystwo pointersstrings
#169Majority Element✓
easysearching sortingarrays
Solution
#268Missing Number○
easyhashingarraysbit manipulation
#1426Counting Elements○
easyhashingarrays
#2389Longest Subsequence With Limited Sum○
easybinary searcharrays

medium · 30

#3Longest Substring Without Repeating Characters✓
mediumarrayssliding windowstrings
Solution
#11Container With Most Water✓
mediumarraystwo pointers
#153Sum✓
mediumarraystwo pointers
#63Unique Paths II○
mediumdynamic programmingarrays
#74Search a 2D Matrix✓
mediumsearching sortingarrays
#75Sort Colors✓
mediumsearching sortingarraystwo pointers
Solution
#79Word Search○
mediumbacktrackingarrays
#167Two Sum II - Input Array Is Sorted✓
mediumarraystwo pointers
#179Largest Number✓
mediumsearching sortingarrays
Solution
#200Number of Islands○
mediumgraphsarrays
#209Minimum Size Subarray Sum○
mediumarrayssliding window
#215Kth Largest Element in an Array○
mediumheapsarrays
#309Best Time to Buy and Sell Stock with Cooldown○
mediumdynamic programmingarrays
#347Top K Frequent Elements○
mediumhashingarrays
#424Longest Repeating Character Replacement✓
mediumarrayssliding windowstrings
#560Subarray Sum Equals K○
mediumarrayssliding windowhashing
#567Permutation in String✓
mediumarrayssliding windowstrings
#695Max Area of Island○
mediumgraphsarrays
#714Best Time to Buy and Sell Stock with Transaction Fee○
mediumdynamic programmingarrays
#904Fruit Into Baskets○
mediumarrayssliding window
#930Binary Subarrays With Sum○
mediumarrayssliding window
#931Minimum Falling Path Sum○
mediumdynamic programmingarrays
#973K Closest Points to Origin○
mediumheapsarrays
#1306Jump Game III○
mediumgraphsarrays
#1631Path With Minimum Effort○
mediumgraphsarrays
#1926Nearest Exit from Entrance in Maze○
mediumgraphsarrays
#1962Remove Stones to Minimize the Total○
mediumheapsarrays
#2101Detonate the Maximum Bombs○
mediumgraphsarrays
#2225Find Players With Zero or One Losses○
mediumhashingarrays
#gfg-search-matrixSearch in Row-Column Sorted Matrix✓
mediumsearching sortingarrays

hard · 7

#42Trapping Rain Water✓
hardarraystwo pointers
#76Minimum Window Substring✓
hardarrayssliding windowstrings
#239Sliding Window Maximum○
hardqueuesarrayssliding window
#340Longest Substring with At Most K Distinct Characters○
hardarrayssliding windowstrings
#992Subarrays with K Different Integers○
hardarrayssliding window
#1004Max Consecutive Ones III○
hardarrayssliding window
#1248Count Number of Nice Subarrays○
hardarrayssliding window