Two Sum
Find two numbers in an array that add up to a given target.
ArraysHashing
Acceptance 49.2%Solve
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Problems
Easy
Valid Parentheses
Determine whether a string of brackets is correctly balanced.
StackStrings
Acceptance 42.8%Solve
Binary Search
Find the target value in a sorted array using binary search.
Binary SearchArrays
Acceptance 58.1%Solve
Best Time to Buy and Sell Stock
Find the maximum profit possible from buying and selling a stock.
ArraysGreedy
Acceptance 55.4%Solve
Valid Anagram
Determine whether two strings contain the same characters with the same frequencies.
HashingStrings
Acceptance 64.7%Solve
Longest Substring Without Repeating Characters
Find the length of the longest substring containing no repeated characters.
Sliding WindowHashing
Acceptance 36.8%Solve
Search in Rotated Sorted Array
Search for a target inside a rotated sorted array in logarithmic time.
Binary SearchArrays
Acceptance 41.3%Solve
Subarray Sum Equals K
Count the number of continuous subarrays whose sum equals a given value.
Prefix SumHashing
Acceptance 44.1%Solve