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  1. #include <bits/stdc++.h>
  2. // v.erase( unique(all(v)) , v.end() )    ----->   removes duplicates and resizes the vector as so
  3. using namespace std;
  4. #define ll long long
  5. #define lld long double
  6. const lld pi = 3.14159265358979323846;
  7. #define pb push_back
  8. #define pf push_front
  9. #define all(a) a.begin(),a.end()
  10. #define rall(a) a.rbegin(),a.rend()
  11. #define getunique(v) {sort(v.begin(), v.end()); v.erase(unique(v.begin(), v.end()), v.end());}
  12. constexpr int mod = (int)(1e9+7);
  13. #define log(x) (31^__builtin_clz(x)) // Easily calculate log2 on GNU G++ compilers
  14.  
  15. int main()
  16. {ios_base::sync_with_stdio(0),cin.tie(0);
  17. ll w,h,n;cin>>w>>h>>n;
  18. ll en=n,st=1;ll ans=max(w,h)*n;
  19. while(en>=st){
  20.   ll mid=en-(en-st)/2;
  21.   if(mid*w>=(n+mid-1)/mid*h){
  22.     ans=min(ans,mid*w);
  23.     en=mid-1; continue;
  24.   }
  25.   st=mid+1;
  26. }
  27. swap(w,h);
  28. en=n;st=1;
  29. while(en>=st){
  30.   ll mid=en-(en-st)/2;
  31.   if(mid*w>=(n+mid-1)/mid*h){
  32.     ans=min(ans,mid*w);
  33.     en=mid-1; continue;
  34.   }
  35.   st=mid+1;
  36. }
  37. cout<<ans<<'\n';
  38.  
  39.  
  40.  
  41.  
  42.  
  43.     return 0;
  44. }
  45. /*
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  62.  
  63. */
Success #stdin #stdout 0.01s 5516KB
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234806042350944
https://ideone.com/k0CxRW
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
public

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