PAT 1080. Graduate Admission (平行志愿模拟题)

学生总分高的排名在前；

总分相同，GE得分高的排名在前；

GE相同，则排名相同。

注意到，编写<algorithm>里的sort函数所调用的比较函数不能在前两个条件相等时，直接返回true.

知道原理的告诉我声... 我是改成了a.m_number < b.m_number, 即比较学生的id.

	friend bool operator< (const Applicant& a, const Applicant& b)
	{
		int aa = a.m_ge + a.m_gi;
		int bb = b.m_ge + b.m_gi;
		if (aa != bb)
		{
			return aa > bb;
		} else if (a.m_ge != b.m_ge)
		{
			return a.m_ge > b.m_ge; 
		} else
		{
			return a.m_number < b.m_number; ////// true
		}
	}

代码：

#include <cstdio>
#include <vector>
#include <algorithm>
#include <list>

using namespace std;

struct Applicant
{
	int m_number;
	int m_ge;
	int m_gi;
	list<int> m_choice;
	friend bool operator== (const Applicant& a, const Applicant& b)
	{
		return a.m_ge == b.m_ge && a.m_gi == b.m_gi;
	}
	friend bool operator< (const Applicant& a, const Applicant& b)
	{
		int aa = a.m_ge + a.m_gi;
		int bb = b.m_ge + b.m_gi;
		if (aa != bb)
		{
			return aa > bb;
		} else if (a.m_ge != b.m_ge)
		{
			return a.m_ge > b.m_ge; 
		} else
		{
			return a.m_number < b.m_number; ////// true
		}
	}
};

Applicant applicant[40010];
vector<int> school[110];
int n, m, k, quota[110];
int capacity, ge, gi, choice;

void choose_school(int begin, int end)
{
	bool full[110];
	for (int i = 0; i < m; ++ i)
	{
		full[i] = school[i].size() >= quota[i];
	}
	for (int i = begin; i < end; ++ i)
	{
		for (auto it = applicant[i].m_choice.begin(); it != applicant[i].m_choice.end(); ++ it)
		{
			if (full[*it] == false)
			{
				school[*it].push_back( applicant[i].m_number );
				break;
			}
		}
	}
}

int main()
{
	scanf("%d%d%d", &n, &m, &k);
	for (int i = 0; i < m; ++ i)
	{
		scanf("%d", quota + i);
	}
	for (int i = 0; i < n; ++ i)
	{
		applicant[i].m_number = i;
		scanf("%d%d", &applicant[i].m_ge, &applicant[i].m_gi);
		for (int j = 0; j < k; ++ j)
		{
			scanf("%d", &choice);
			applicant[i].m_choice.push_back(choice);
		}
	}
	sort(applicant, applicant+n);

	for (int i = 0; i < n; )
	{
		int begin = i;
		++ i;
		while (i < n && applicant[i] == applicant[begin])
		{
			++ i;
		}
		choose_school(begin, i);
	}

	for (int i = 0; i < m; ++ i)
	{
		sort (school[i].begin(), school[i].end());
		bool first = true;
		for (size_t j = 0; j < school[i].size(); ++ j)
		{
			if (first)
			{
				printf("%d", school[i][j]);
				first = false;
			} else
			{
				printf(" %d", school[i][j]);
			}
		}
		printf("\n");
	}

	return 0;
}