Set matrix zeroes

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62.5% acceptance

Jan 12, 2026

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Given an m x n integer matrix matrix, if an element is 0, set its entire row and column to 0's. You must do it in place.

Solution

Rust

Time O(n²)

Space O(1)

LeetCode

solution.rs

impl Solution {
  pub fn set_zeroes(matrix: &mut Vec<Vec<i32>>) {
    let m = matrix.len();
    let n = matrix[0].len();
    let mut first_row_zero = false;
    let mut first_col_zero = false;
    
    // Check if first row has zero
    for j in 0..n {
      if matrix[0][j] == 0 {
        first_row_zero = true;
        break;
      }
    }
    
    // Check if first column has zero
    for i in 0..m {
      if matrix[i][0] == 0 {
        first_col_zero = true;
        break;
      }
    }
    
    // Use first row and column as markers
    for i in 1..m {
      for j in 1..n {
        if matrix[i][j] == 0 {
          matrix[i][0] = 0;
          matrix[0][j] = 0;
        }
      }
    }
    
    // Set zeros based on markers
    for i in 1..m {
      for j in 1..n {
        if matrix[i][0] == 0 || matrix[0][j] == 0 {
          matrix[i][j] = 0;
        }
      }
    }
    
    // Set first row
    if first_row_zero {
      for j in 0..n {
        matrix[0][j] = 0;
      }
    }
    
    // Set first column
    if first_col_zero {
      for i in 0..m {
        matrix[i][0] = 0;
      }
    }
  }
}