Increasing Triplet Subsequence

class Solution {
public:
    bool increasingTriplet(vector<int>& nums) {
        int first_s=INT_MAX;
        int second_s=INT_MAX;
        for(int i=0;i<nums.size();i++)
        {
            if(nums[i]<=first_s)
            {
                first_s=nums[i];
            }
            else if(nums[i]<=second_s)
            {
                second_s=nums[i];
            }
            else
            {
                return true;
            }
        }
        return false;

    }
};