here is my code / Valences submitted by Arjun Mishra /

include<iostream>

include<string.h>

include<math.h>

using namespace std; long long int A; long long int compare[21]; void function() {long long int i; compare[0]=1; for(i=1;i<=20;i++) compare[i]=(long long int)pow(2,i); } int main() {long long int N,i,a,sum=0; function(); //for(i=0;i<=20;i++) //cout<<compare[i]<<endl; while(1)="" {sum="0;" cin="">>N; if(N==0) return 0; for(i=0;i<=20;i++) { if(N>=compare[i]&&N<compare[i+1]) {a="compare[i];" cout<<i<<endl;="" break;}="" <br=""/> } //cout<<a<<endl; for(i="1;i&lt;=a-1;i++)" cin="">>A; for(i=a;i<=N;i++) {cin>>A; sum+=A; //cout<<sum<<endl; } cout<<sum<<endl; } }

i don't know why it is producing WA after 50s of execution