class Solution {
public:
    bool increasingTriplet(vector<int>& nums) {
        int a=INT_MAX,b=INT_MAX;
        for(auto num:nums)
        {
            if(num<=a)
            {
                a=num;
            }
            else if(num<=b)
            {
                b=num;
            }
            else
            {
                return true;
            }
        }
        return false;
    }
};