20240620 Finished
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@ -153,4 +153,5 @@ mod p199_binary_tree_right_side_view;
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mod p637_average_of_levels_in_binary_tree;
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mod p530_minimum_absolute_difference_in_bst;
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mod p230_kth_smallest_element_in_a_bst;
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mod p98_validate_binary_search_tree;
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mod p98_validate_binary_search_tree;
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mod p200_number_of_islands;
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61
src/problem/p200_number_of_islands.rs
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61
src/problem/p200_number_of_islands.rs
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@ -0,0 +1,61 @@
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/**
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* [200] Number of Islands
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*/
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pub struct Solution {}
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// submission codes start here
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impl Solution {
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fn is_in_grid(x: i32, y: i32, grid: &Vec<Vec<char>>) -> bool {
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let m = grid.len() as i32;
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let n = grid[0].len() as i32;
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x >= 0 && x < m && y >= 0 && y < n
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}
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fn dfs(grid: &mut Vec<Vec<char>>, x: i32, y: i32) {
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if !Self::is_in_grid(x, y, grid) {
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return;
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}
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if grid[x as usize][y as usize] != '1' {
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return;
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}
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grid[x as usize][y as usize] = '2';
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Self::dfs(grid, x - 1, y);
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Self::dfs(grid, x + 1, y);
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Self::dfs(grid, x, y + 1);
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Self::dfs(grid, x, y - 1);
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}
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pub fn num_islands(grid: Vec<Vec<char>>) -> i32 {
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let m = grid.len();
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let n = grid[0].len();
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let mut result = 0;
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let mut grid = grid;
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for i in 0..m {
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for j in 0..n {
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if grid[i][j] == '1' {
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result += 1;
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Self::dfs(&mut grid, i as i32, j as i32);
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}
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}
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}
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result
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}
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}
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// submission codes end
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_200() {
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}
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}
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