晴天 · 发布于 2025-03-23 · 浏览 429 回复 0

int a, b = 0, i;
cin >> a;
for (i = 2; i <= a - 1; i++) {
	if (a % i == 0) {
		b++;
	}
}
if (b == 0)
	cout << "1";
else
	cout << "-1";
return 0;