LeetCode Medium - 島嶼數量
LeetCode
程式碼
class Solution {
public int numIslands(char[][] grid) {
int count = 0;
for (int i = 0; i < grid.length; i++) {
for (int j = 0; j < grid[i].length; j++) {
if (grid[i][j] == '1') {
count++;
clearIsland(grid, i, j);
}
}
}
return count;
}
private void clearIsland(char[][] grid, int i, int j) {
if (i < 0 || j < 0 || i >= grid.length || j >= grid[i].length || grid[i][j] == '0') return;
grid[i][j] = '0';
clearIsland(grid, i, j-1); // up
clearIsland(grid, i, j+1); // down
clearIsland(grid, i-1, j); // left
clearIsland(grid, i+1, j); // right
}
}