样例对的，结果上传后只对了八个（吐血

if(WA * 8 + AC * 2) 血压++;

代码如下：

#include <iostream>
#include <algorithm>
using namespace std;
const int MAXN = 5001;
struct player{
	public:
		int score;
		int id;
};
bool cmp(player a, player b){
	return a.score > b.score;
}
bool cmp2(player a, player b){
	return a.id < b.id;
}
struct player players[MAXN];
int n, m;
int main(){
	cin >> n >> m;
	for(int i = 1; i <= n; i++){
		cin >> players[i].id >> players[i].score;
	}
	sort(players + 1, players + n + 1, cmp2);
	sort(players + 1, players + n + 1, cmp);
	int t = m * 1.5, ans = 0;
	for(int i = 1; i <= n; i++){
		if(players[i].score >= players[t].score){
			ans++;
		}
	}
	cout << players[t].score << " " << ans << endl;
	for(int i = 1; i <= ans; i++){
		cout << players[i].id << " " << players[i].score << endl;
	}
	return 0;
}