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  1. #include <bits/stdc++.h>
  2. #define ll long long
  3. using namespace std;
  4. ll n,k,s=0;
  5. ll check(ll x)
  6. {
  7.     ll p=n,t1=0,t2=0,res=n/2;
  8.     while(p!=0)
  9.     {
  10.         if (p>=x)
  11.         {
  12.             t1+=x;
  13.             p-=x;
  14.             if (p>9) {t2+=p/10;p-=p/10;}
  15.         }
  16.         else {t1+=p;p-=p;}
  17.     }
  18.     if (t1>=res) return 1;
  19.     else return 0;
  20. }
  21. ll tknp(ll l,ll r)
  22. {ll ans=10e8;
  23.     while(l<=r)
  24.     {
  25.         ll g=(l+r)/2;
  26.         if (check(g)!=0)
  27.         {
  28.             r=g-1;
  29.             ans=g;
  30.         }
  31.         else l=g+1;
  32.     }
  33.     return ans;
  34. }
  35. int main()
  36. {
  37.   cin>>n;
  38.   s=tknp(0,10e18);
  39.   cout<<s;
  40.     return 0;
  41. }
  42.  
Success #stdin #stdout 0s 5284KB
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https://ideone.com/3hhJYA
language:
C++ (gcc 8.3)
created:
11 days ago
visibility:
public

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