python/LuoGu/RuMen/P1304.cpp

#include<bits/stdc++.h>

using namespace std;

bool isPrime(int number) {
    for (int i = 2; i * i <= number; i++)
        if (number % i == 0)
            return false;
    return true;
}

int main() {
    int n;//输入的数
    cin >> n;
    //计算从4开始到这个指定数字结束
    for (int i = 4; i <= n; i += 2) {
        for (int j = 2; j < i; j++) {
            if (isPrime(j) && isPrime(i - j)) {
                cout << i << "=" << j << "+" << i - j << endl;
                break;
            }
        }
    }
}