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mistake in the code

itsme007 (1)
i am expecting to get correct answer for every value of x, n and a[i] where
-10^9 <= a[i] <= 10^9
1 <= x <= 10^18
and 1 <= n <= 10000
every value here is an integer value
but i am wrong somewhere but dont know where

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 #include<cstdio>
#include<iostream>
#include<cmath>
#include <float.h>

#define sBig long long int
 
using namespace std;
sBig CONS = 1000000007;
 
inline sBig mod(sBig a)
{ return (a%CONS+CONS)%CONS; }
 

sBig a[10010], rem[10010];
int n;
sBig solve(sBig x)
{
    sBig temp = x;
    sBig num = 0;
    int s = 0;
    sBig z, tmp;
    bool sign;
 
    num = 0;
   num = mod(mod(x)*a[1]);
    int j = 2;
    for(;  j <= n ; j++)
    {
 
        int nrt = floor(pow(x,1.0/(double)j));
        if(nrt < 2)
            break;
 

        tmp = mod((nrt)*a[j]);
        num = mod(num +  tmp);
    }
    sBig res = mod(num);
    if(n > 1)
        res = mod(num + rem[j]);
 
    return res;
}
main()
{
    int  q;
    sBig x;
        scanf("%d%d",&n,&q);
 
        rem[n+1] = 0;
        sBig z;
        for(int i = 1; i <= n; i++)
          {
                scanf("%lld",&a[i]);
          }
 

        for(int i = n; i > 0; i--)
            rem[i] = mod(rem[i+1] + a[i]);
 
        for(int i = 0; i < q  ; i++)
        {
            scanf("%lld",&x);
            printf("%lld ",solve(x));
        }
return 0;
}
flony1 (27)
on line 45, should be
int main()
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