A Cubic number and A Cubic Number 两数立方差

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Problem Description
A cubic number is the result of using a whole number in a multiplication three times. For example, 3×3×3=27 so 27 is a cubic number. The first few cubic numbers are 1,8,27,64 and 125. Given an prime number p. Check that if p is a difference of two cubic numbers.
 

Input
The first of input contains an integer T (1T100) which is the total number of test cases.
For each test case, a line contains a prime number p (2p1012).
 

Output
For each test case, output 'YES' if given p is a difference of two cubic numbers, or 'NO' if not.
Sample Input
102357111317192329
 

Sample Output
NONONOYESNONONOYESNONO


#include <iostream>

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


int main()
{
    int T,p,flag,i;
    scanf("%d",&T);
    while(T--)
    {
        flag=0;
        scanf("%d",&p);
        for(i=1;i<=1e6+10;i++)
        {
            if(3*i*i+3*i+1==p)   //(x-y)(x^2+xy+y^2)=p(p是质数)——> x-y=1以及x^2+xy+y^2=p,    将(x-y=1)带入后得到p=3x^2+3x+1。 
            {
                flag=1;
                break;
            }
        }
        if(flag) 
 printf("YES\n");
        else
 printf("NO\n");
    }
    return 0;
}