Answer Happy

Suppose we have a square matrix: int matrix[n][n], where n>0.
Can you briefly describe what the code below does (word limit:
100)? You may use an example and draw a figure to illustrate your
idea if you want.
for (int x = n-1; x > -1; x--) { for (int y = 0; y <n; y++) { if (x < n-1 && y > 0) { matrix [x][y] += std::min (matrix [x+1] [y], matrix [x] [y-1]); } else if (x < n-1) { matrix [x][y] += matrix [x+1] [y]; } else if (y > 0) { matrix [x][y] += matrix [x] [y-1]; } std::cout << matrix [0] [n-1] << std::endl;