函数名有问题，hash改成myhash即可
by Lunar_Hjj @ 2023-07-20 16:41:03
@[lcy12](/user/615490) hash是关键字，不能用来做函数名
by Creeper_l @ 2023-07-20 16:41:17
[评测记录](https://www.luogu.com.cn/record/116612079)
```cpp
#include<bits/stdc++.h>
#define int long long
#define base 131
#define PRIME 233317
using namespace std;
unsigned long long mod=212370440130137957;
int n,a[100005],ans=1;
string s;
int myhash(string s)
{
int y=s.size();
int sum=0;
for(int i=0;i<y;i++)
sum=(sum*base+(int)s[i])%mod+PRIME;
return sum;
}
signed main()
{
cin>>n;
for(int i=1;i<=n;i++)
{
cin>>s;
a[i]=myhash(s);
}
sort(a+1,a+n+1);
for(int i=2;i<=n;i++)
if(a[i]!=a[i-1])
ans++;
cout<<ans;
}
```
by Lunar_Hjj @ 2023-07-20 16:41:49
懂力，谢谢s组dalao们
by lcy_123 @ 2023-07-20 16:43:36