【PAT】1025. PAT Ranking (25)

题目链接：http://pat.zju.edu.cn/contests/pat-a-practise/1025

题目描述：

Programming Ability Test (PAT) is organized by the College of Computer Science and Technology of Zhejiang University. Each test is supposed to run simultaneously in several places, and the ranklists will be merged immediately after the test. Now it is your job to write a program to correctly merge all the ranklists and generate the final rank.

Input Specification:

Each input file contains one test case. For each case, the first line contains a positive number N (<=100), the number of test locations. Then N ranklists follow, each starts with a line containing a positive integer K (<=300), the number of testees, and then K lines containing the registration number (a 13-digit number) and the total score of each testee. All the numbers in a line are separated by a space.

Output Specification:

For each test case, first print in one line the total number of testees. Then print the final ranklist in the following format:

registration_number final_rank location_number local_rank

The locations are numbered from 1 to N. The output must be sorted in nondecreasing order of the final ranks. The testees with the same score must have the same rank, and the output must be sorted in nondecreasing order of their registration numbers.

Sample Input:

2
5
1234567890001 95
1234567890005 100
1234567890003 95
1234567890002 77
1234567890004 85
4
1234567890013 65
1234567890011 25
1234567890014 100
1234567890012 85

Sample Output:

9
1234567890005 1 1 1
1234567890014 1 2 1
1234567890001 3 1 2
1234567890003 3 1 2
1234567890004 5 1 4
1234567890012 5 2 2
1234567890002 7 1 5
1234567890013 8 2 3
1234567890011 9 2 4

---

分析：

（1）对结构体排序并且合并。

（2）注意grade一样的情况下的处理。

（3）可以参考这篇：http://blog.csdn.net/realxuejin/article/details/10382159

参考代码：

#include<iostream>
#include<string>
#include<algorithm>
#include<vector>
#include<functional>
using namespace std;
typedef struct student
{
	string num;
	int grade;
	int final_rank;
	int location_num;
	int local_rank;
	//注意以下这段的写法
	bool operator > (const student& s)const
	{
		if(grade != s.grade)
			return grade > s.grade;
		else return num < s.num;
	}
}student;

#define max 30000
#define INF 0x6FFFFFFF
vector<student> v;

int main()
{
	int n,m;
	int i,j;
	cin>>n;
	for(i=0; i<n; i++)
	{
		cin>>m;
		vector<student> temp(m);
		for(j=0; j<m; j++)
		{
			cin>>temp[j].num>>temp[j].grade;
			temp[j].location_num = i+1;
		}
		sort(temp.begin(),temp.end(),greater<student>());
		int nowGrade = INF;
		int nowRank = 0;
		for(j=0; j<m; j++)
		{
			////
			//cout<<temp[j].num<<"   "<<temp[j].location_num<<endl;
			if(temp[j].grade == nowGrade)
				temp[j].local_rank = nowRank;
			else
			{
				temp[j].local_rank = j+1;
				nowRank = j + 1;
				nowGrade = temp[j].grade;
			}
			v.push_back(temp[j]);
		}
	}
	// 处理global_rank
	sort(v.begin(),v.end(),greater<student>());   //此处用到greater，头文件应该有#include<functional>
	int nowGrade = INF;
	int nowRank = 0;
	cout<<v.size()<<endl;
	for(i=0; i<v.size(); i++)
	{
		if(v[i].grade == nowGrade)
			v[i].final_rank = nowRank;
		else
		{
			nowRank = i+1;
			v[i].final_rank = i+1;
			nowGrade = v[i].grade;
		}
		cout<<v[i].num<<" "<<v[i].final_rank<<" "<<v[i].location_num<<" "<<v[i].local_rank<<endl;
	}

	return 0;
}