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#include <iostream>
#include <map>
#include <vector>
#include <string>
#include <algorithm>
using namespace std;
 
int main() 
{
	map<string,vector<int>> countriesAndYears;
 
	int n;
	string country;
	int year,visit;
	cin >> n;
	for(int i=0;i<n;++i)
	{
		cin >> country >> year;
		countriesAndYears[country].push_back(year);
	}
	for (const auto& elem : countriesAndYears)
	{
		sort(elem.begin(),elem.end());
	}
	cin >> n;
	for(int i=0;i<n;++i)
	{
		cin >> country >> visit;
		cout << countriesAndYears[country][visit-1] << "\n";
	}
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:23:13: error: ‘const struct std::pair<const std::__cxx11::basic_string<char>, std::vector<int> >’ has no member named ‘begin’
   sort(elem.begin(),elem.end());
             ^~~~~
prog.cpp:23:26: error: ‘const struct std::pair<const std::__cxx11::basic_string<char>, std::vector<int> >’ has no member named ‘end’; did you mean ‘second’?
   sort(elem.begin(),elem.end());
                          ^~~

Standard output is empty