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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. typedef long long ll;
  5.  
  6. const int N = 2e5+10;
  7. int n, p;
  8. ll a[N];
  9.  
  10. bool check(ll t) {
  11.     ll rs = 0;
  12.     for(int i=0; i<n; i++) {
  13.         rs += t/a[i];
  14.         if(rs >= p) return true;
  15.     }
  16.     return rs >= p;
  17. }
  18.  
  19. int32_t main() {
  20.     ios::sync_with_stdio(false);
  21.     cin.tie(nullptr);
  22.  
  23.     cin >> n >> p;
  24.     for(int i=0; i<n; i++) {
  25.         cin >> a[i];
  26.     }
  27.     ll l=0, r=1e18;
  28.     ll rs=r;
  29.     while(l<=r) {
  30.         ll mid = (l+r)/2;
  31.         if(check(mid)){
  32.             rs=mid;
  33.             r=mid-1;
  34.         }
  35.         else{
  36.             l=mid+1;
  37.         }
  38.     }
  39.     cout<<rs<<endl;
  40.  
  41.     return 0;
  42. }
Success #stdin #stdout 0s 5324KB
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stdout 
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https://ideone.com/qoHCol
language:
C++14 (gcc 8.3)
created:
8 hours ago
visibility:
public

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