// 参考了:https://discuss.leetcode.com/topic/51893/two-solutions-one-is-dp-the-other-is-greedy-8-lines
// 另有:https://discuss.leetcode.com/topic/51946/very-simple-java-solution-with-detail-explanation class Solution {
public:
int wiggleMaxLength(vector<int>& nums) {
int up = , down = ;
if (nums.size() <= ) {
return nums.size();
}
for (int i=; i<nums.size(); ++i) {
if (nums[i] < nums[i-]) {
down = up + ;
}
else if (nums[i] > nums[i-]) {
up = down + ;
}
}
return max(up, down);
}
};

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