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#217. 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: nums = [1,2,3,1] Output: trueExample 2: Input: nums = [1,2,3,4] Output: fals

【代码】D01- leetcode 121. Best Time to Buy and Sell Stock。

1-Two number sum(两数之和) write a function that takes in a non-empty array of distinct integers and an integer representing a target sum. if any two numbers in the input array sum up to the target sum, the function should return them in an array in any order.