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  1. #include <iostream>
  2. #include <cstdio>
  3.  
  4. using namespace std;
  5.  
  6. int main() {
  7.     ios_base::sync_with_stdio(false);
  8.     cin.tie(nullptr);
  9.  
  10. #ifndef ONLINE_JUDGE
  11.     freopen("input.txt", "r", stdin);
  12.     freopen("output.txt", "w", stdout);
  13. #endif
  14.  
  15.     int x, y;
  16.     cin >> x >> y;
  17.  
  18.     bool found = false;
  19.  
  20.     for (int i = x; i <= y; i++) {
  21.         bool c = true;
  22.         int a = i;
  23.         int b = i;
  24.  
  25.         while (b != 0) {
  26.             a = b % 10;
  27.             b /= 10;
  28.  
  29.             if (a == 4 || a == 7) {
  30.                 c = true;
  31.             } else {
  32.                 c = false;
  33.                 break;
  34.             }
  35.         }
  36.  
  37.         if (c == true) {
  38.             cout << i << " ";
  39.             found = true;
  40.         }
  41.     }
  42.  
  43.     if (found == false) {
  44.         cout << -1 << endl;
  45.     }
  46.  
  47.     return 0;
  48. }
Success #stdin #stdout 0s 5348KB
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4 20
stdout
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4 7
https://ideone.com/IAz9Hw
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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