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折半枚举大水题

Posted by 13408100238 at 2015-05-10 20:42:07 on Problem 1840
#include <iostream>
#include <cstdio>
#include <cstring>
#include <cmath>
#include <algorithm>
#include <map>
using namespace std;
typedef long long LL;
const int MS=50;
const int SIZE=10000;

int hash[SIZE];
int cnt;

int main()
{
    int a1,a2,a3,a4,a5;
    while(scanf("%d%d%d%d%d",&a1,&a2,&a3,&a4,&a5)!=EOF)
    {
        cnt=0;
        for(int i=-MS;i<=MS;i++)
            for(int j=-MS;j<=MS;j++)
        {
            if(i==0||j==0)
                continue;
            int t=a1*i*i*i+a2*j*j*j;
            hash[cnt++]=t;
        }
        sort(hash,hash+cnt);
        int ans=0;
        for(int i=-MS;i<=MS;i++)
            for(int j=-MS;j<=MS;j++)
                for(int k=-MS;k<=MS;k++)
        {
            if(i==0||j==0||k==0)
                continue;
            int t=a3*i*i*i+a4*j*j*j+a5*k*k*k;
            ans+=upper_bound(hash,hash+cnt,-t)-lower_bound(hash,hash+cnt,-t);
        }
        printf("%d\n",ans);
    }
    return 0;
}




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