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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int SNT(int n)
  4. {
  5.     if(n < 2) return 0;
  6.     int dem = 0;
  7.     for(int i = 2; i <= sqrt(n); i++)
  8.     {
  9.         if(n % i == 0)
  10.             return 0;
  11.     }
  12.     return 1;
  13. }
  14.  
  15.  
  16. int main()
  17. {
  18.     int n, a, b;
  19.     while(cin >> n)
  20.     {
  21.         a = -1000000000;
  22.         for(int i = n; i >= 1; i--)
  23.         {
  24.             if(SNT(i) == 1)
  25.             {
  26.                 a = i;
  27.                 break;
  28.             }
  29.         }
  30.         for(int i = n; i<= n + 10000000; i++)
  31.         {
  32.             if(SNT(i) == 1)
  33.             {
  34.                 b = i;
  35.                 break;
  36.             }
  37.         }
  38.         if(n - a <= b - n)
  39.             cout << a << endl;
  40.         else cout << b << endl;
  41.     }
  42. }
  43.  
Success #stdin #stdout 0s 5312KB
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https://ideone.com/ASztW6
language:
C++14 (gcc 8.3)
created:
8 hours ago
visibility:
public

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