fork download 
  1. #include <iostream>
  2. #include <cmath>
  3. #include <queue>
  4. #include <vector>
  5.  
  6. using namespace std;
  7.  
  8. int n;
  9. queue<int> res;
  10.  
  11. bool nto(int x) {
  12.     if (x < 2)
  13.         return false;
  14.     for (int i = 2; i <= sqrt(x); i++)
  15.         if (x % i == 0)
  16.             return false;
  17.     return true;
  18. }
  19.  
  20. int len(int x) {
  21.     int d = 1;
  22.     while (x / 10 != 0) {
  23.         x /= 10;
  24.         d++;
  25.     }
  26.     return d;
  27. }
  28. void solve(int n) {
  29.     if (n == 1) {
  30.         res.push(2);
  31.         res.push(3);
  32.         res.push(5);
  33.         res.push(7);
  34.         return;
  35.     }
  36.     solve(n - 1);
  37.  
  38.     bool stop = false;
  39.     while (!stop) {
  40.         int x = res.front();
  41.         if (len(x) == n) 
  42.             stop = true;
  43.         else {
  44.             for (int i = 1; i < 10; i++)
  45.                 if (nto(x*10 + i)) {
  46.                     res.push(x*10 + i);
  47.                 }
  48.             res.pop();
  49.         }   
  50.     }
  51. }
  52.  
  53.  
  54. int main() {
  55.     cin>> n;
  56.     solve(n);
  57.     int d = 0;
  58.     while (!res.empty()) {
  59.         cout<< ++d<< " "<< res.front()<< endl;
  60.         res.pop();
  61.     }
  62. }
Success #stdin #stdout 0s 5280KB
comments (?)
stdin 
5
stdout 
1 23333
2 23339
3 23399
4 23993
5 29399
6 31193
7 31379
8 37337
9 37339
10 37397
11 59393
12 59399
13 71933
14 73331
15 73939
https://ideone.com/C3VWax
language:
C++ (gcc 8.3)
created:
93 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!