fork download
copy 
  1. // author : anphung
  2. #include<bits/stdc++.h>
  3. using namespace std;
  4. #define file "SOCHAN"
  5. #define int64 long long
  6. #define f0(i,a,b) for(int (i) = (a); (i) <= (b); ++i)
  7. #define TIME (1.0*clock()/CLOCKS_PER_SEC)
  8.  
  9. int64 n;
  10.  
  11. int64 s(int64 n){
  12.     int64 sum = 0;
  13.     while(n){
  14.         sum += n%10;
  15.         n/=10;
  16.     }
  17.     return sum;
  18. }
  19.  
  20. void trau(){
  21.     int64 cnt = 0;
  22.     f0(i,1,n){
  23.         if(s(i)%2==0){
  24.             cnt++;
  25.         }
  26.         cout<<i<<" "<<cnt<<'\n';
  27.     }
  28.     cout<<cnt;
  29. }
  30.  
  31. void sub(){
  32.     if(s(n)%2==0){
  33.         if(n%2==0){
  34.             cout<<n/2;
  35.         }else if(n%2!=0){
  36.             cout<<n/2;
  37.         }
  38.     }else if(s(n)%2!=0){
  39.         if(n%2==0){
  40.             cout<<n/2-1;
  41.         }else if(n%2!=0){
  42.             cout<<n/2;
  43.         }
  44.     }
  45. }
  46.  
  47. int32_t main(){
  48.     ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
  49.     freopen(file".inp","r",stdin);
  50.     freopen(file".out","w",stdout);
  51.  
  52.     cin>>n;
  53.     sub();
  54.  
  55.     //cerr<<"\ntime elapsed: "<<TIME <<"s.\n";
  56. }
  57.  
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Standard output is empty
https://ideone.com/rSmxiW
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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!