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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. const int N = 1000001;
  4. int lp[N + 1];
  5. vector<int> pr;
  6. int main() {
  7.  
  8.     for (int i = 2; i <= N; ++i) {
  9.         if (lp[i] == 0) {
  10.             lp[i] = i;
  11.             pr.push_back(i);
  12.         }
  13.         for (int j = 0; j<(int)pr.size() && pr[j] <= lp[i] && i*pr[j] <= N; ++j)
  14.             lp[i * pr[j]] = pr[j];
  15.     }
  16.     cout<<pr[2000];
  17.     cin.get(), cin.get();
  18.     return 0;
  19. }
Success #stdin #stdout 0.01s 7320KB
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https://ideone.com/8LFRFN
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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