A5.分数线划定 普及- 题解

#include<iostream>
#include<cmath>
#include<vector>
#include<algorithm>

struct Employee
{
	int id, score;
};


int main()
{
	int n, m;	std::cin >> n >> m;
	std::vector<Employee> a(n);
	for (int i = 0; i < n; i++){
		std::cin >> a[i].id >> a[i].score;
	}
	std::sort(a.begin(), a.end(), [&](Employee a, Employee b) -> bool
	{
		if (a.score != b.score) return a.score > b.score;
        return a.id < b.id;
	});
	int scoreline = a[std::floor(m*1.5)-1].score;

	std::cout << scoreline << ' ';
	int admissions = 0;
	for (int i = 0; i < n; i++)
	{
		if (a[i].score >= scoreline){
			admissions ++;
		}
		else break;
	}
    std::cout << admissions << '\n';
	for (int i = 0; i < admissions; i++){
		std::cout << a[i].id << ' ' << a[i].score << '\n';
	}
	return 0;
}