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  1. #include <bits/stdc++.h>
  2. #define MOD 1000000007
  3. #define Tran_Hoan_Thien ios::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)
  4. #define fi first
  5. #define se second
  6. #define pb push_back
  7. #define vi vector<int>
  8. #define ll long long
  9. #define vll vector<ll>
  10. #define db double
  11. #define pii pair<int,int>
  12. #define endl "\n"
  13. #define str  string
  14. #define pk  pop_back
  15. #define LB  lower_bound
  16. #define UB  upper_bound
  17. #define all(a) a.begin(),a.end()
  18. #define sz(a) int((a).size())
  19. #define rv(a)    a.rbegin(),a.rend()
  20. using namespace std;
  21. ll gcd(ll a,ll b){return __gcd(a,b);} 
  22. ll lcm(ll a,ll b){return a/gcd(a,b)*b;}
  23. int main(){
  24.     #define TASK ""
  25.     if(fopen(TASK ".inp", "r")){
  26.         freopen(TASK ".inp", "r", stdin);
  27.         freopen(TASK ".out", "w", stdout);
  28.     }
  29.     freopen("Tile.inp", "r", stdin);
  30.     freopen("Tile.out", "w", stdout); 
  31.     Tran_Hoan_Thien;
  32.     int n;cin>>n;
  33.     vector<int> a(n);
  34.     for(int &x:a) cin>>x;
  35.     sort(a.begin(),a.end(),greater<int> ());
  36.     int dem=1;
  37.     int k=a[0];
  38.     for(int i=1;i<n;i++){
  39.         if(k<=0) break;
  40.         dem++;
  41.         k=min(k-1,a[i]);
  42.     }
  43.     cout<<dem;
  44.     return 0;  
  45. }
  46.  
Success #stdin #stdout 0s 5300KB
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https://ideone.com/UytcZr
language:
C++14 (gcc 8.3)
created:
16 days ago
visibility:
public

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