Function diagonal_sum

1572-matrix-diagonal-sum.rs:33–44

(mat: Vec<Vec<i32>>)

}

pub fn diagonal_sum(mat: Vec<Vec<i32>>) -> i32 {
    let mut sum = 0;
    let length = mat.len();
    for (i, v) in mat.iter().enumerate() {
        sum += v[i];
        sum += v[length-i-1];
    }
    if length % 2 != 0 {
        sum -= mat[length/2][length/2];
    }
    sum
}