2018hdu个人排位赛：Team Match

给n个数，n%3==0，求如何组队能有最多队伍拿奖。。。算是暴力枚举吧。。

#include<bits/stdc++.h>
using namespace std;
#define mem(a,b) memset(a,b,sizeof(a))
int n,m,a[35],vis[35];

bool check(int x)
{
    int l = (n/3-x)*3 + 1,r = n;
    mem(vis,0);
    while (l<r)
    {
        int flag = 1;
        for ( int i=l+1 ; i<r ; i++ )
        {
            if ( !vis[i] && 3*a[r]+2*a[i]+a[l]>=m )
            {
                vis[i] = 1;
                flag = 0;
                break;
            }
        }
        if (flag)
            return false;
        vis[l] = 1,vis[r] = 1;
        while (vis[l])
            l++;
        while (vis[r])
            r--;
    }
    return true;
}

int main()
{
    int T;
    scanf ("%d",&T);
    while(T--)
    {
        scanf ("%d%d",&n,&m);
        for (int i=1; i<=n; i++ )
            scanf ("%d",&a[i]);
        sort(a+1,a+n+1);
        int ans = n/3;
        while(ans)
        {
            if(check(ans))
                break;
            else
                ans--;
        }
        printf ( "%d\n", ans );
    }
    return 0;
}