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class Solution { public int numIslands(char[][] grid) { int ans = 0; for(int r = 0; r < grid.length; r++) { for(int c = 0; c < grid[0].length; c++) { if(grid[r][c] == '1') { ans++; dfs(grid, r, c); } } } return ans; } public void dfs(char[][] grid, int r, int c) { if(!(0 <= r && r < grid.length && 0 <= c && c < grid[0].length)) { return; } if(grid[r][c] == '0') { return; } if(grid[r][c] == '2') { return; } grid[r][c] = '2'; dfs(grid, r + 1, c); dfs(grid, r - 1, c); dfs(grid, r, c + 1); dfs(grid, r, c - 1); }}
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