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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. const int li = 15485863;
  5. bool isp[li + 1];
  6. long long pr[li], ps[li + 1];
  7.  
  8. void prse() {
  9.     fill(isp, isp + li + 1, true);
  10.     isp[0] = isp[1] = false;
  11.     int cnt = 0;
  12.     for (int i = 2; i <= li; i++) {
  13.         if (isp[i]) {
  14.             pr[cnt++] = i;
  15.             for (int j = i * 2; j <= li; j += i)
  16.                 isp[j] = false;
  17.         }
  18.     }
  19.     for (int i = 0; i < cnt; i++) {
  20.         ps[i + 1] = ps[i] + pr[i];
  21.     }
  22. }
  23.  
  24. int main() {
  25.     ios::sync_with_stdio(false);
  26.     cin.tie(nullptr);
  27.     freopen("nguyento.inp", "r", stdin);
  28.     freopen("nguyento.out", "w", stdout);
  29.  
  30.     prse();
  31.     int te;
  32.     cin >> te;
  33.     while (te--) {
  34.         int n;
  35.         cin >> n;
  36.         cout << ps[n] << "\n";
  37.     }
  38.     return 0;
  39. }
  40.  
  41.  
Success #stdin #stdout 0.21s 37572KB
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https://ideone.com/JJQP3Y
language:
C++14 (clang 8.0)
created:
4 days ago
visibility:
public

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