題目

https://leetcode.com/problems/max-area-of-island/

題解

class Solution {int M, N;public int maxAreaOfIsland(int[][] grid) {M = grid.length;N = grid[0].length;boolean[][] visited = new boolean[M][N];int result = 0;for (int i = 0; i < M; i++) {for (int j = 0; j < N; j++) {if (!visited[i][j]) {result = Math.max(result, dfs(grid, i, j, visited));}}}return result;}public int dfs(int[][] board, int i, int j, boolean[][] visited) {if (i < 0 || i == M || j < 0 || j == N || visited[i][j]) return 0;visited[i][j] = true;int result = 0;if (board[i][j] == 1) {result += 1;result += dfs(board, i - 1, j, visited);result += dfs(board, i + 1, j, visited);result += dfs(board, i, j - 1, visited);result += dfs(board, i, j + 1, visited);}return result;} }

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