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// 73. Set Matrix Zeroes
// given an 'm x n' integer matrix 'matrix', if an element is 0,
// set its entire row and column to 0's. must be done in place
// (https://en.wikipedia.org/wiki/In-place_algorithm)
impl Solution {
pub fn set_zeroes(matrix: &mut Vec<Vec<i32>>) {
let n_rows = matrix.len();
let n_cols = matrix[0].len();
let mut first_row = false;
let mut first_col = false;
for row in 0..n_rows {
for col in 0..n_cols {
if matrix[row][col] == 0 {
if row == 0 {
first_row = true;
}
if col == 0 {
first_col = true;
}
matrix[0][col] = 0;
matrix[row][0] = 0;
}
}
}
for row in 1..n_rows {
for col in 1..n_cols {
if matrix[row][0] == 0 || matrix[0][col] == 0 {
matrix[row][col] = 0
}
}
}
if first_row {
for col in 0..n_cols {
matrix[0][col] = 0;
}
}
if first_col {
for row in 0..n_rows {
matrix[row][0] = 0;
}
}
}
}
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