我爬了，应该是读入的问题

#include <cstdio>
int n, m;
int mapp[1002][1002];
int ans[1002][1002];
bool vis[1002][1002];
bool vis2[1002][1002];
int dfs(int x, int y)
{
    if (x <= 0 || x >= n + 1 || y <= 0 || y >= n + 1)
        return 0;
    if (vis[x][y])
        return 0;
    vis[x][y] = true;
    int ans = 1;
    if (mapp[x + 1][y] == mapp[x][y] ^ 1)
        ans += dfs(x + 1, y);
    if (mapp[x - 1][y] == mapp[x][y] ^ 1)
        ans += dfs(x - 1, y);
    if (mapp[x][y + 1] == mapp[x][y] ^ 1)
        ans += dfs(x, y + 1);
    if (mapp[x][y - 1] == mapp[x][y] ^ 1)
        ans += dfs(x, y - 1);
    return ans;
}
void print(int x, int y, int k)
{
    if (x <= 0 || x >= n + 1 || y <= 0 || y >= n + 1)
        return;
    if (vis2[x][y])
        return;
    vis2[x][y] = true;
    ans[x][y] = k;
    if (mapp[x + 1][y] == mapp[x][y] ^ 1)
        print(x + 1, y, k);
    if (mapp[x - 1][y] == mapp[x][y] ^ 1)
        print(x - 1, y, k);
    if (mapp[x][y + 1] == mapp[x][y] ^ 1)
        print(x, y + 1, k);
    if (mapp[x][y - 1] == mapp[x][y] ^ 1)
        print(x, y - 1, k);
}
int main()
{
    scanf("%d%d", &n, &m);
    int i, j;
    int x, y;
    char ch;
    for (i = 0; i <= n + 1; i++)
        for (j = 0; j <= n + 1; j++)
            mapp[i][j] = -1;
    getchar();
    for (i = 1; i <= n; i++)
    {
        for (j = 1; j <= n; j++)
        {
            ch = getchar();
            mapp[i][j] = ch == '0' ? 0 : 1;
        }
        getchar();
    }
    for (i = 1; i <= n; i++)
        for (j = 1; j <= n; j++)
            if (!vis[i][j])
                print(i, j, dfs(i, j));
    for (i = 1; i <= m; i++)
    {
        scanf("%d%d", &x, &y);
        printf("%d\n", ans[x][y]);
    }
    return 0;
}