Triangle

class Solution {
public:
    int minimumTotal(vector<vector<int>>& triangle) {
        int n = triangle.size();
        vector<int> sums(triangle[n -1]);
        for(int i = n - 2; i >= 0; i--) {
            for(int j = 0; j <= i; j++) {
                sums[j] = min(sums[j], sums[j + 1]) + triangle[i][j];                
            }
        }
        return sums[0];
    }
};