fork download
copy 
  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4. ll n,x,y,ans,res,d,k,sum,testcase=1,a[100005],i,j,b[100005],c[100005];
  5. void stake13007(){
  6.     cin>>n>>k;
  7.     b[0]=0;
  8.     c[0]=0;
  9.     for (i=1; i<=n; i++) {
  10.         cin>>a[i];
  11.         b[i]=b[i-1]+a[i];
  12.         c[i]=c[i-1]+a[i]*a[i];
  13.     }
  14.     while (k--) {
  15.         ans=0; res=0;
  16.         cin>>x>>y;
  17.         res=b[y]-b[x-1];
  18.         ans=(res*res+c[x-1]-c[y])/2;
  19.         cout<<ans<<endl;
  20.     }
  21. }
  22. int main() {
  23.     //cin>>testcase;
  24.     while (testcase--){
  25.         stake13007();
  26.     }
  27. }
  28.  
Success #stdin #stdout 0s 5304KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Standard output is empty
https://ideone.com/D5QswW
language:
C++14 (gcc 8.3)
created:
140 days ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!