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