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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4. #define int long long
  5. #define yes cout << "YES\n";
  6. #define no cout << "NO\n";
  7.  
  8.  
  9. void FastIO() {
  10.     ios_base::sync_with_stdio(false);
  11.     cin.tie(nullptr);
  12.     cout.tie(nullptr);
  13. }
  14.  
  15. void solve(){
  16.     int n,k;
  17.     cin >> n >> k;
  18.  
  19.     int time = 240 - k;
  20.  
  21.     vector<int>cost(n);
  22.  
  23.     for(int i = 0; i < n; i++){
  24.         cost[i] = 5*(i+1);
  25.         if(i)
  26.             cost[i] += cost[i-1];
  27.     }
  28.  
  29.     int l = 0, r = n-1, ans = n, mid;
  30.  
  31.     while(l <= r){
  32.         mid = (l+r)/2;
  33.  
  34.         if(cost[mid] > time){
  35.             ans = mid;
  36.             r = mid - 1;
  37.         }
  38.         else
  39.             l = mid + 1;
  40.     }
  41.     cout << ans;
  42. }
  43.  
  44.  
  45. signed main(){
  46.     FastIO();
  47.  
  48.     int t = 1;
  49.     //cin >> t;
  50.  
  51.     while (t--){
  52.         solve();
  53.     }
  54.     return 0;
  55. }
Success #stdin #stdout 0s 5320KB
comments (?)
stdin 
3 222
stdout 
2
https://ideone.com/7JcLWR
New Year and Hurry
language:
C++14 (gcc 8.3)
created:
9 days ago
visibility:
public

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