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Codeforces Team Olympiad(暴力)

2024-08-04 11:19:21   218人阅读

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A. Team Olympiad
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output

The School №0 of the capital of Berland has n children studying in it. All the children in this school are gifted: some of them are good at programming, some are good at maths, others are good at PE (Physical Education). Hence, for each child we know value ti:

  • ti?=?1, if thei-th child is good at programming,
  • ti?=?2, if thei-th child is good at maths,
  • ti?=?3, if thei-th child is good at PE

Each child happens to be good at exactly one of these three subjects.

The Team Scientific Decathlon Olympias requires teams of three students. The school teachers decided that the teams will be composed of three children that are good at different subjects. That is, each team must have one mathematician, one programmer and one sportsman. Of course, each child can be a member of no more than one team.

What is the maximum number of teams that the school will be able to present at the Olympiad? How should the teams be formed for that?

Input

The first line contains integer n (1?≤?n?≤?5000) — the number of children in the school. The second line containsn integers t1,?t2,?...,?tn (1?≤?ti?≤?3), where ti describes the skill of thei-th child.

Output

In the first line output integer w — the largest possible number of teams.

Then print w lines, containing three numbers in each line. Each triple represents the indexes of the children forming the team. You can print both the teams, and the numbers in the triplets in any order. The children are numbered from 1 to n in the order of their appearance in the input. Each child must participate in no more than one team. If there are several solutions, print any of them.

If no teams can be compiled, print the only line with value w equal to 0.

Sample test(s)
Input
7
1 3 1 3 2 1 2
Output
2
3 5 2
6 7 4
Input
4
2 1 1 2
Output
0

题解：

       本题要求把1,2,3尽可能的平均分配到3个容器中，保证每一个都包含1、2、3，求这样的最大组合数以及输出一种可能的组合。可以暴力枚举！时间复杂度O(n)，空间复杂度也为O(n)。

源代码：

#include<iostream>
#include<cstdio>
using namespace std;

const int MAXN=5000+100;
int per[3][MAXN];

int min(int a,int b)
{
	return a<b?a:b;
}

int main()
{
	int n,cnt1,cnt2,cnt3,tmp,count,i;
	while(~scanf("%d",&n))
	{
		cnt1=0,cnt2=0,cnt3=0;
		i=1;
		while(i<=n)
		{
			scanf("%d",&tmp);
			switch(tmp)
			{
			case 1:per[0][cnt1++]=i;break;
			case 2:per[1][cnt2++]=i;break;
			case 3:per[2][cnt3++]=i;break;
			}
			++i;
		}	
		count=min(min(cnt1,cnt2),cnt3);	
		printf("%d\n",count);
		for(int i=0;i<count;i++)
		{
			printf("%d %d %d\n",per[0][i],per[1][i],per[2][i]);
		}
	}
	return 0;
}





Codeforces Team Olympiad(暴力)


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