有没有办法解决描述中提到的问题，以便在Intellij IDEA上运行代码

Question

它说，"从未使用"练习"类；以及"；从未使用方法"maxAreaOfIsland(int[][]("；加上"；Typo：在单词"trav"中；。输出应该是数字6，但由于上述问题，它永远不会到达数字6。我正试图解决这个问题，以便生成一个输出。这段代码是从leetcode.com上借来的。它在该网站的java编译器中工作，但在int Intellij IDEA中不工作。

class Practice {
private int n, m;
public int maxAreaOfIsland(int[][] grid) {
int ans = 0;
n = grid.length;
m = grid[0].length;
for (int i = 0; i < n; i++)
for (int j = 0; j < m; j++)
if (grid[i][j] > 0) ans = Math.max(ans, trav(i, j, grid));
return ans;
}
private int trav(int i, int j, int[][] grid) {
if (i < 0 || j < 0 || i >= n || j >= m || grid[i][j] < 1) return 0;
grid[i][j] = 0;
return 1 + trav(i-1, j, grid) + trav(i, j-1, grid) + trav(i+1, j, grid) + trav(i, j+1, grid);
}
public static void main(String[] args){
int value;
Practice example = new Practice();
int[][] yourGrid = {{0,0,1,0,0,0,0,1,0,0,0,0,0},{0,0,0,0,0,0,0,1,1,1,0,0,0},{0,1,1,0,1,0,0,0,0,0,0,0,0},{0,1,0,0,1,1,0,0,1,0,1,0,0},{0,1,0,0,1,1,0,0,1,1,1,0,0},{0,0,0,0,0,0,0,0,0,0,1,0,0},{0,0,0,0,0,0,0,1,1,1,0,0,0},{0,0,0,0,0,0,0,1,1,0,0,0,0}};
value = example.maxAreaOfIsland(yourGrid);
System.out.println(value);
}

}

Answer 1

基于更新/和注释：

工作示例如下：

class Practice {
private int n, m;
public int maxAreaOfIsland(int[][] grid) {
int ans = 0;
n = grid.length;
m = grid[0].length;
for (int i = 0; i < n; i++)
for (int j = 0; j < m; j++)
if (grid[i][j] > 0) ans = Math.max(ans, trav(i, j, grid));
return ans;
}
private int trav(int i, int j, int[][] grid) {
if (i < 0 || j < 0 || i >= n || j >= m || grid[i][j] < 1) return 0;
grid[i][j] = 0;
return 1 + trav(i-1, j, grid) + trav(i, j-1, grid) + trav(i+1, j, grid) + trav(i, j+1, grid);
}

public static void main(String[] args){
Practice example = new Practice();
int[][] yourGrid = {{0,0,1,0,0,0,0,1,0,0,0,0,0},{0,0,0,0,0,0,0,1,1,1,0,0,0},{0,1,1,0,1,0,0,0,0,0,0,0,0},{0,1,0,0,1,1,0,0,1,0,1,0,0},{0,1,0,0,1,1,0,0,1,1,1,0,0},{0,0,0,0,0,0,0,0,0,0,1,0,0},{0,0,0,0,0,0,0,1,1,1,0,0,0},{0,0,0,0,0,0,0,1,1,0,0,0,0}};
example.maxAreaOfIsland(yourGrid);
}
}

(注：注释/更新中已经提到了解释(