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  1. #include <iostream>
  2. #include <algorithm>
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7.    long long int n1,n2,ans,flag;
  8.  
  9.     while(cin>>n1)
  10.     {
  11.         cin>>n2;
  12.         flag=0;
  13.         if(n1==n2)
  14.         {
  15.             cout<<n1<<endl;
  16.             continue;
  17.         }
  18.     if(n1>n2)
  19.         {
  20.             swap(n1,n2);
  21.         }
  22.     if((n1<=0&&n2<=0))
  23.         {
  24.             flag=1;
  25.             n1=abs(n1);
  26.             n2=abs(n2);
  27.             ans = ((n2*n2-n1*n1)+(n2-n1))/2;
  28.             ans-=n2;
  29.             cout<<ans<<endl;
  30.         }
  31.         else if((n1>=0&&n2>=0))
  32.         {
  33.              flag=0;
  34.              n1=abs(n1);
  35.              n2=abs(n2);
  36.              ans = ((n2*n2-n1*n1)+(n2-n1))/2;
  37.              ans+=n1;
  38.              cout<<ans<<endl;
  39.         }
  40.         else
  41.         {
  42.             n1=abs(n1);
  43.             n2=abs(n2);
  44.             n1=(n1*(n1+1))/2;
  45.             n2=(n2*(n2+1))/2;
  46.             n1=-n1;
  47.             ans=n1+n2;
  48.             cout<<ans<<endl;
  49.         }   
  50.     }
  51. return 0;
  52. }
Success #stdin #stdout 0s 4328KB
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https://ideone.com/msYkuJ
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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