二進制轉十進制 然後按位比較

傳送門 http://codeforces.com/gym/101063

#include <cstdio>
#include <cmath>
#include <cstring>
#include <cstdlib>
#include <iostream>
#include <sstream>
#include <algorithm>
#include <string>
#include <queue>
#include <vector>
using
 
 namespace std;
const int maxn= 100005;
const double eps= 1e-6;
const int inf = 0x3f3f3f3f;
const int mod =3;
typedef long long ll;
typedef long double ld;
int n,m;
int a[maxn][15];
int b[maxn];
ll c[maxn];
ll d[maxn];
int main()
{
    while(scanf("%d %d",&n,&m)!=EOF)
    {
        memset(b,0,sizeof
 
(b));
        memset(c,0,sizeof(c));
        for(int i=1;i<=n;i++)
        {
            int t;
            scanf("%d",&t);
            for(int j=1;j<=t;j++)
            {
                scanf("%d",&a[i][j]);
                b[i]+=(1<<(a[i][j]-1));
            }
            c[b[i]]
 
++;
        }
        for(int i=1;i<=1023;i++)
        {
            int k=i;
            d[i]=0;
            while(k>0)
            {
                if(k%2)
                    d[i]++;        //i轉換成二進制有多少個1
                k/=2;
            }
            //printf("%d %d\n",i,d[i]);
        }
        ll ans=0;
        ld r;
        cin>>r;
        for(int i=1;i<=1023;i++)
        {
            for(int j=i;j<=1023;j++)
            {
                int q=i&j,p=i|j;
                ld k=(ld)d[q]/(ld)d[p];
                if(k>=r)
                {
                    if(i!=j)
                        ans+=c[i]*c[j];
                    else
                        ans+=c[i]*(c[i]-1)/2;
                }
            }
        }
        printf("%I64d\n",ans);
    }
}

codeforces Gym 101063 C