My code give wrong answer; i am not find what is problem in code

#1

my code:
#include
using namespace std;

int main()
{
long long int n,a,b,i;
cin>>n>>a>>b;

long long int s[n];
for(i=0;i<n;i++) cin>>s[i];

long long int sum=0,j,count=0,k;

for(i=0;i<((1<<n));i++)
{

    sum=0;
    k=0;
    j=i;
    while(j)
    {
        if(j&1) {sum += s[k];}
        k++;
        j=j>>1;
    }
    if(sum >= a  &&  sum <= b) count++;
}

cout<<count<<endl;

}

#2

Refer this, your doubt will be resolved.

#3

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