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  1. // ORZVANH14
  2. //⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣠⣤⣤⣤⣤⣤⣶⣦⣤⣄⡀⠀⠀⠀⠀⠀⠀⠀⠀
  3. //⠀⠀⠀⠀⠀⠀⠀⠀⢀⣴⣿⡿⠛⠉⠙⠛⠛⠛⠛⠻⢿⣿⣷⣤⡀⠀⠀⠀⠀⠀
  4. //⠀⠀⠀⠀⠀⠀⠀⠀⣼⣿⠋⠀⠀⠀⠀⠀⠀⠀⢀⣀⣀⠈⢻⣿⣿⡄⠀⠀⠀⠀
  5. //⠀⠀⠀⠀⠀⠀⠀⣸⣿⡏⠀⠀⠀⣠⣶⣾⣿⣿⣿⠿⠿⠿⢿⣿⣿⣿⣄⠀⠀⠀
  6. //⠀⠀⠀⠀⠀⠀⠀⣿⣿⠁⠀⠀⢰⣿⣿⣯⠁⠀⠀⠀⠀⠀⠀⠀⠈⠙⢿⣷⡄⠀
  7. //⠀⠀⣀⣤⣴⣶⣶⣿⡟⠀⠀⠀⢸⣿⣿⣿⣆⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⣷⠀
  8. //⠀⢰⣿⡟⠋⠉⣹⣿⡇⠀⠀⠀⠘⣿⣿⣿⣿⣷⣦⣤⣤⣤⣶⣶⣶⣶⣿⣿⣿⠀
  9. //⠀⢸⣿⡇⠀⠀⣿⣿⡇⠀⠀⠀⠀⠹⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡿⠃⠀
  10. //⠀⣸⣿⡇⠀⠀⣿⣿⡇⠀⠀⠀⠀⠀⠉⠻⠿⣿⣿⣿⣿⡿⠿⠿⠛⢻⣿⡇⠀⠀
  11. //⠀⣿⣿⠁⠀⠀⣿⣿⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⣿⣧⠀⠀
  12. //⠀⣿⣿⠀⠀⠀⣿⣿⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⣿⣿⠀⠀
  13. //⠀⣿⣿⠀⠀⠀⣿⣿⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⣿⣿⠀⠀
  14. //⠀⢿⣿⡆⠀⠀⣿⣿⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⣿⡇⠀⠀
  15. //⠀⠸⣿⣧⡀⠀⣿⣿⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⣿⠃⠀⠀
  16. //⠀⠀⠛⢿⣿⣿⣿⣿⣇⠀⠀⠀⠀⠀⣰⣿⣿⣷⣶⣶⣶⣶⠶⠀⢠⣿⣿⠀⠀⠀
  17. //⠀⠀⠀⠀⠀⠀⠀⣿⣿⠀⠀⠀⠀⠀⣿⣿⡇⠀⣽⣿⡏⠁⠀⠀⢸⣿⡇⠀⠀⠀
  18. //⠀⠀⠀⠀⠀⠀⠀⣿⣿⠀⠀⠀⠀⠀⣿⣿⡇⠀⢹⣿⡆⠀⠀⠀⣸⣿⠇⠀⠀⠀
  19. //⠀⠀⠀⠀⠀⠀⠀⢿⣿⣦⣄⣀⣠⣴⣿⣿⠁⠀⠈⠻⣿⣿⣿⣿⡿⠏⠀⠀⠀⠀
  20. //⠀⠀⠀⠀⠀⠀⠀⠈⠛⠻⠿⠿⠿⠿⠋⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
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  28.  
  29. #include <bits/stdc++.h>
  30.  
  31. using namespace std;
  32.  
  33. #define int unsigned long long
  34. #define ld long double
  35. #define pb push_back
  36. #define fi first
  37. #define se second
  38. #define nn '\n'
  39. #define pi pair<ll,ll>
  40. #define unmp unordered_map
  41. #define uns unordered_set
  42. #define lb lower_bound
  43. #define ub upper_bound
  44. #define pq priority_queue
  45. #define queue q
  46. #define faster ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  47. #define TASK " "
  48. int mod = 1e9+7;
  49. const int N = 1e5 + 5;
  50. int MOD = 998244353;
  51. int bit[200000];
  52. int n, w, h;
  53. int a[N];
  54. bool anhphucbell(int mid){
  55.     int hehe = (mid / w) * (mid / h);
  56.     return hehe >= n;
  57. }
  58. signed main(){
  59.     ios_base::sync_with_stdio(0);
  60. 	cin.tie(0);
  61. 	cout.tie(0);
  62.     if(fopen(TASK".INP","r")){
  63.         freopen(TASK".INP","r",stdin);
  64.         freopen(TASK".OUT","w",stdout);
  65.     }
  66.     cin >> w >> h >> n;
  67.     int l = 1, r = 1e18, kq = -1;
  68.     while(l <= r){
  69.         int mid = (l + r) / 2;
  70.         if(anhphucbell(mid)){
  71.             kq = mid;
  72.             r = mid - 1;
  73.         }
  74.         else{
  75.             l = mid + 1;
  76.         }
  77.  
  78.     }
  79.     cout << kq << nn;
  80. 	return 0;
  81. }
  82.  
  83.  
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin 
2 3 10
stdout 
9
https://ideone.com/yyfXns
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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