请问一下，这个为什么CE了？
```c++
#include<bits/stdc++.h>
using namespace std;
#define ull unsigned long long
const int N = 1e4 + 5;
const int inf = 1e9 + 2024;
int n;
ull a[N];
char s[N];
ull BKDRHash(char* s) {
ull p = 31, h = 0;
int n = strlen(s);
for (int i = 0; i < n; i++) {
h = h * p + s[i] - 'a' + 1;
}
return h;
}
int main(void) {
ios::sync_with_stdio(false), cin.tie(0);
cin >> n;
for (int i = 1; i <= n; i++) {
gets_s(s);
a[i] = BKDRHash(s);
}
int ans = 0;
sort(a + 1, a + n + 1);
for (int i = 1; i <= n; i++) {
if (a[i] != a[i + 1]) {
ans++;
}
}
cout << ans;
return 0;
}
```
by phrym @ 2024-03-02 15:28:24
@[phrym](/user/93965) gets_s(s); 26行gets_s(s)未定义。
by mlemtion @ 2024-03-07 13:47:09
@[mlemtion](/user/946696) 啊？还是失败的哭了……
by phrym @ 2024-03-10 19:49:19