Python3解leetcode Reach a Number
问题描述： You are standing at position 0 on an infinite number line. There is a goal at position target . On each move, you can either go left or right. During the n -th move (starting from 1), you take n steps. Return the minimum number of steps required to reach the destination. Example 1: Input: target = 3 Output: 2 Explanation: On the first move we step from 0 to 1. On the second step we step from 1 to 3. Example 2: Input: target = 2 Output: 3 Explanation: On the first move we step from 0 to 1. On the second move we step from 1 to -1. On the third move we step from -1 to 2. Note: target will