leet-code/transpose-matrix/sol.rs

impl Solution {
    pub fn transpose(matrix: Vec<Vec<i32>>) -> Vec<Vec<i32>> {
        let n = matrix[0].len();
        (0..n).into_iter()
            .map(|i| matrix
                .iter()
                .map(|row| row[i])
                .collect()
            )
            .collect()
    }
}