Contains Duplicate
Contains Duplicate: Given an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct. Example 1: Input:…
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First Missing Positive
First Missing Positive: Given an unsorted integer array nums, return the smallest missing positive integer.
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Backspace String Compare
Backspace String Compare: Given two strings s and t, return true if they are equal when both are typed into empty text editors.
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Target Sum
Target Sum: You are given an integer array nums and an integer target.