盛大游戏游戏服务端C++笔试第二题岛屿个数题请教
在本机能成功运行，但为啥一直提交错误呢，下面代码有啥错误啊，请大佬指教
#include <iostream>
#include <vector>
using namespace std;
int l[4] = { -1, 0, 1, 0 };
int r[4] = { 0, -1, 0, 1 };
void dfs(vector<vector<int>> &v, const int a, const int b) {
v[a][b] = 0;
for (int k = 0; k < 4; ++k) {
int i = l[k] + a, j = r[k] + b;
if (i >= 0 && i < v.size() && j >= 0 && j < v[0].size()) {
if (v[i][j] == 1)
dfs(v, i, j);
}
}
}
int main() {
int n, m;
cin >> n >> m;
vector<vector<int>> v(n, vector<int>(m));
int val;
for (int i = 0; i < n; ++i)
for (int j = 0; j < m; ++j)
cin >> v[i][j];
int count = 0;
for (int i = 0; i < n; ++i) {
for (int j = 0; j < m; ++j)
if (v[i][j] == 1) {
dfs(v, i, j);
++count;
}
}
cout << count << endl;
return 0;
} 
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