UVAoj11991

<pre name="code" class="cpp">#include<iostream>
#include<vector>
#include<map>
using namespace std;
map<int, vector<int> >a;
int main()
{
	int n,m,i,x,y;
 	while(cin>>n>>m)
 	{
	  	a.clear();
	  	for(i=0;i<n;i++)
	  	{
		  	cin>>x;
	   		if(!a.count(x))
	   		{
	    		a[x]=vector<int>();
	  		}
			a[x].push_back(i+1);
  		}
	  	while(m--)
	  	{
	   		cin>>x>>y;
	   		if(!a.count(y)||a[y].size()<x)
	    		cout<<0<<endl;
	   		else
	    		cout<<a[y][x-1]<<endl;
	  	}
	}
	return 0;
}