[NOIP2017]图书管理员 (nowcoder.com)
cpp
#include<bits/stdc++.h>
#define endl '\n'
#define int long long
using namespace std;
const int N =2e5+10,M=1e3+10;
int a[N];
int n,q;
int check(int l,int x)
{
int tmp=pow(10,l);
for(int i=1;i<=n;i++)
{
if(a[i]%tmp==x)
{
cout<<a[i]<<endl;
return 0;
}
}
cout<<-1<<endl;
return 0;
}
signed main()
{
std::ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
cin>>n>>q;
for(int i=1;i<=n;i++)cin>>a[i];//book bianma
sort(a+1,a+1+n);
while(q--)
{
int l,x;cin>>l>>x;
check(l,x);
}
return 0;
}