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