1 #include <iostream> 2 #include <stdio.h> 3 #include <string> 4 #include <stack> 5 #include <map> 6 #include <vector> 7 #include <algorithm> 8 using namespace std; 9 10 bool isPrime(int n) {11     if (n == 2) return true;12     if (n % 2 == 0 || n == 1) return false;13     for (int i = 3; i*i <= n; ++i) {14         if (n % i == 0) return false;15     }16     return true;17 }18 19 int main()20 {21     int N;22     while (cin >> N && N) {23         bool flag = false;24         for (int i = 3; i <= N/2; i+=2) {25             if (isPrime(i) && isPrime(N-i)) {26                 flag = true;27                 cout << N << " = " << i << " + " << N-i << endl;28                 break;29             }30         }31         if (!flag) cout << "Goldbach‘s conjecture is wrong." << endl;32     }33 34     return 0;35 }