题解

#include<bits/stdc++.h>
using namespace std;
bool cmp(pair<int,int> x,pair<int,int> y){
	if(x.second==y.second){
		return x.first<y.first;
	}
	return x.second>y.second;
}
int main(){
	int n,m;
	cin >> n >> m;
	vector<pair<int,int>>v(n+9);
	for(int i=1;i<=n;i++){
		int x,y;
		cin >> x >> y;
		v.push_back({x,y});
	}
	sort(v.begin(),v.end(),cmp);
	int a=v[m*1.5-1].second,a1=m*1.5-1,a2=m*1.5-1;
	for(int i=a1;i<n;i++)
		if(v[i].second>=a) a2++; 
	cout << a << " " << a2 << '\n';
	for(int i=0;i<a2;i++)
		cout << v[i].first << " " << v[i].second << '\n';
	return 0;
}