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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.  
  30.     freopen("Camdien.inp", "r", stdin);
  31.     freopen("Camdien.out", "w", stdout); 
  32.  
  33.     Tran_Hoan_Thien;
  34.     int n, m;
  35.     cin >> n >> m;
  36.     vector<int> a(n);
  37.     for (int &x : a) cin >> x;
  38.  
  39.     sort(a.rbegin(), a.rend());  
  40.     int total = 0;
  41.     int cnt = 0;
  42.     for (int i = 0; i < n; i++) {
  43.         if (i == 0) total += a[i];  
  44.         else total += a[i] - 1;     
  45.         cnt++;
  46.         if (total >= m) {
  47.             cout << cnt;
  48.             return 0;
  49.         }
  50.     }
  51.     cout << -1;
  52.     return 0;
  53. }
  54.  
Success #stdin #stdout 0.01s 5272KB
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https://ideone.com/VwMlu9
language:
C++14 (gcc 8.3)
created:
16 days ago
visibility:
public

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