leetcode 334. Increasing Triplet Subsequence

class Solution {public:    bool increasingTriplet(vector<int>& nums)     {        if (nums.size() <= 2)        {            return false;        }        auto num1 = std::numeric_limits<int>::max();        auto num2 = num1;        for(auto num  : nums)        {            if(num <= num1)            {                num1 = num;            }            else if(num <= num2)            {                num2 = num;            }            else            {                return true;            }        }        return false;    }};