面试题：Rust 中如何高效构建二维数组并初始化特定值

Question

在Rust中，要求构建一个5x5的二维数组，并且数组中的每个元素初始值都为该元素所在行号与列号的乘积。请写出相应代码实现。

Answer 1

fn main() {
    let mut matrix: [[i32; 5]; 5] = [[0; 5]; 5];
    for i in 0..5 {
        for j in 0..5 {
            matrix[i][j] = i as i32 * j as i32;
        }
    }
    for row in matrix.iter() {
        for &element in row.iter() {
            print!("{} ", element);
        }
        println!();
    }
}