#include #include #include #include using namespace std; //Written by Coffee. 判断素数 bool isPrime(int num) { if (num == 2 || num == 3) { return true; } if (num % 6 != 1 && num % 6 != 5) { return false; } for (int i = 5; i*i <= num; i += 6) { if (num % i == 0 || num % (i+2) == 0) { return false; } } return true; } int main() { int n,k; vector vec; scanf("%d %d",&n,&k); int tmp; for(int i=0;i