C++ | Leetcode C++题解之第376题摆动序列

题目：

题解：

class Solution {
public:int wiggleMaxLength(vector<int>& nums) {int n = nums.size();if (n < 2) {return n;}int prevdiff = nums[1] - nums[0];int ret = prevdiff != 0 ? 2 : 1;for (int i = 2; i < n; i++) {int diff = nums[i] - nums[i - 1];if ((diff > 0 && prevdiff <= 0) || (diff < 0 && prevdiff >= 0)) {ret++;prevdiff = diff;}}return ret;}
};