求助

不知道为什么这个居然编译不了

//
//  main.cpp
//  2
//
//  Created by Shellpicker on 2019/11/12.
//  Copyright © 2019 XZY. All rights reserved.
//

#include <iostream>
#include <algorithm>
#include <string>
using namespace std;
const int sim=1000;
const int lim=2000;
int n,q;
int len[sim+1];
string book[lim+1],code[sim+1];
bool cmp(int i,int j);
int main(int argc, const char * argv[]) {
    // insert code here...
    cin>>n>>q;
    for(int i=1;i<=n;i++)
        cin>>book[i];
    sort(book+1,book+n+1,cmp);
    for(int i=1;i<=q;i++){
        cin>>len[i];
        cin>>code[i];
    }
    for(int i=1;i<=q;i++){
        bool f=false;
        for(int j=1;j<=n;j++){
            bool sec=true;
            int l=len[i];
            for(int k=1;k<=l;k++)
                if(book[i][book[i].length()-l+k]!=code[i][k]){
                    sec=false;
                    break;
                }
            if(sec==true){
                f=true;
                cout<<i<<endl;
                break;
            }
        }
        if(f==false)
            cout<<"-1"<<endl;
    }
    //std::cout << "Hello, World!\n";
    return 0;
}
bool cmp(int i,int j){
    return i>j;
}