Check if matrix is x matrix

Array Matrix

66.4% acceptance

Feb 25, 2026

546

A square matrix is said to be an X-Matrix if: All the elements in the diagonals of the matrix are non-zero. All other elements are 0. Given a 2D integer array grid of size n x n, return true if grid is an X-Matrix. Otherwise, return false.

Solution

Rust

Time O(n²)

Space O(1)

LeetCode

solution.rs

impl Solution {
  pub fn check_x_matrix(grid: Vec<Vec<i32>>) -> bool {
    let n = grid.len();
    for i in 0..n {
      for j in 0..n {
        let on_diag = i == j || i + j == n - 1;
        if on_diag {
          if grid[i][j] == 0 {
            return false;
          }
        } else if grid[i][j] != 0 {
          return false;
        }
      }
    }
    true
  }
}