HDU-4277(暴力プラス+hash)

#include <cstring>
#include <algorithm>
#include <cstdio>
#include <iostream>
#include <cmath>
#include <vector>
#include <map>
#include <queue>
using namespace std;
#define lson l,m,rt<<1
#define rson m+1,r,rt<<1|1
#define rep(i,n) for(int i=0;i<int(n);i++)
#define rep1(i,x,y) for(int i=x;i<=(int)y;i++)
typedef long long ll;
typedef pair<int,int> pii;

const int N = 16;
const int mm = 1e5+7;
int vis[N],n,cnt,a[N],sum;
int cmp(int a,int b){
    return a>b;
}
struct hashtable
{
    int size,ans[mm][3],next[mm],h[mm];
    int hash(int a,int b,int c){
        return ((((a*131+b)*131+c)*131)&0x7FFFFFFF)%mm;
    }
    void insert(int a,int b,int c){
       int ha = hash(a,b,c);
       for(int i=h[ha]; i!=-1; i=next[i])
          if(ans[i][0]==a && ans[i][1]== b && ans[i][2]== c) return;
       ans[size][0]=a; ans[size][1]=b; ans[size][2]=c;
       next[size]=h[ha];
       h[ha]=size++;
    }
    void clear()
    {
        memset(h,-1,sizeof(h));
        size=0;
    }
} g;
void dfs2(int p,int fir,int val)
{
    if(fir < val) return ;
    if(p == n+1)
    {
        if(val < sum - val - fir) return ;
        g.insert(fir,val,sum-val-fir);
        return ;
    }
    if(!vis[p])
    {
        vis[p] = 1;
        dfs2(p+1,fir,val+a[p]);
        vis[p] = 0;
    }
    dfs2(p+1,fir,val);
}
void dfs(int p,int val)
{
    if(p == n+1)
    {
        if(val < sum - val) dfs2(1,val,0);
        return ;
    }
    vis[p] = 1;
    dfs(p+1, val+a[p]);
    vis[p] = 0;
    dfs(p+1, val);
}
int main()
{
    int T;
    scanf("%d",&T);
    while(T--)
    {
        scanf("%d",&n);
        g.clear();
        memset(vis,0,sizeof(vis));
        sum = 0;
        for(int i=1; i<=n; i++)
        {
            scanf("%d",&a[i]),sum+=a[i];
        }
        sort(a+1,a+1+n,cmp);
        cnt=0;
        dfs(1,0);
        cout<<g.size<<endl;
    }
    return 0;
}