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.
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Roman to Integer: Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M.
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Move Zeroes: Given an integer array nums, move all 0's to the end of it while maintaining the relative order of the non-zero elements.
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First Missing Positive: Given an unsorted integer array nums, return the smallest missing positive integer.
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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: You are given an integer array nums and an integer target.
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