OR subarrays problem

#1

why the code is not working

#include
using namespace std;
int main () {
int n; cin>>n;
int p = (1<<n)-1;
int sum = 0;

int a[n];
for(int i = 1; i<=n;i++){
	cin>>a[i];
}
for(int i = 1; i<=p;i++){
	int x = i;
	int xr = 0;
	while(x>0){
		xr ^= a[x];
		x = x>>1;
	}
	sum += xr;

}
cout<<sum<<endl;
return 0;

}

#2

your approach for solving this question is wrong. Please refer to this article for correct approach

#3

NOW please check my approach

#include

using namespace std;

int main () {

int n; cin>>n;

int p = (1<<n)-1;

int sum = 0;

int a[n];

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

cin>>a[i];

}

for(int i = 0; i<p;i++){

int x = i;

int xr = 0;

int ans = 0;

while(x>0){

  

  if(x&1){

    xr |= a[ans];

  }

  ans++;

  x = x>>1;

}

sum += xr;

}

cout<<sum<<endl;

return 0;

}

#4

please share your code through ide.codingblocks.com

#5

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