双哈希编译错误求帮助

//
//  main.cpp
//  【模板】双哈希
//
//  Created by winstar919 on 2018/9/1.
//  Copyright © 2018年 tatsumaki. All rights reserved.
//

#include <iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
int base=131;
using namespace std;
struct data{
    long long x,y;
}a[10010];
char s[10010];
int n;
bool cmp(data a,data b ){
    return a.x<b.x;
}
long long mod1=19260817,mod2=19660813;
long long hash1(char s[ ]){
    long long ans = 0;
    int len=strlen(s);
    for(int i = 0; i < n; i ++){
        ans = (ans*base+(long long )s[i]) % mod1;
    }
    return ans;
}
long long hash2(char s[ ]){
    long long ans = 0;
    int len = strlen(s);
    for(int i = 0; i < n; i ++)
        ans = (ans * base + (long long )s[i])*mod2;
    return ans;
}
int main() {
    int ans=0;
    scanf("%d",&n);
    for(int i = 0; i < n; i ++){
        scanf("%s",&s[i]);
        a[i].x=hash1(s[i]);
        a[i].y=hash2(s[i]);
    }
    sort(a,a+n,cmp);
    for(int i = 1; i < n; i ++){
        if(a[i].x != a[i - 1].x || a[i].y != a[i - 1].y)
           ans++;
    }
    printf("%d",ans);
    return 0;
}