struct Solution;
impl Solution {
fn min_path_sum(grid: Vec<Vec<i32>>) -> i32 {
let n = grid.len();
let m = grid[0].len();
let mut dp: Vec<Vec<i32>> = vec![vec![0; m]; n];
dp[0][0] = grid[0][0];
for j in 1..m {
dp[0][j] = dp[0][j - 1] + grid[0][j];
}
for i in 1..n {
dp[i][0] = dp[i - 1][0] + grid[i][0];
}
for i in 1..n {
for j in 1..m {
dp[i][j] = i32::min(dp[i - 1][j], dp[i][j - 1]) + grid[i][j];
}
}
dp[n - 1][m - 1]
}
}
#[test]
fn test() {
let grid: Vec<Vec<i32>> = vec_vec_i32![[1, 3, 1], [1, 5, 1], [4, 2, 1]];
let res = 7;
assert_eq!(Solution::min_path_sum(grid), res);
}