本篇题解为纯享版，已做防伪操作。

#include <bits/stdc++.h>
#define by return
#define Rick 0
#define Astley ;
using namespace std;
typedef long long ll;
typedef pair<int, int> P;
const string IN = ".in", OUT = ".out";
string file_name = "";

int T, M, a, b, c, t, t2, t3, A, B;
double t1;
int mian() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr), cout.tie(nullptr);
	if (file_name != "")
		freopen((file_name + IN).c_str(), "r", stdin),
		freopen((file_name + OUT).c_str(), "w", stdout);
	for (cin >> T >> M; T--; ) {
		cin >> a >> b >> c;
		t = b * b - 4 * a * c;
		if (t < 0) {
			cout << "NO\n";
			continue;
		} else if (t == 0) {
			B = a << 1, A = -b;
			t2 = __gcd(A, B);
			A /= t2, B /= t2;
			if ((A < 0) ^ (B < 0)) cout << '-';
			cout << abs(A);
			if (abs(B) != 1) cout << '/' << abs(B);
			cout << '\n';
			continue;
		} t1 = sqrt(t);
		if (floor(t1) == ceil(t1)) {
			t3 = t1, B = a << 1;
			A = (a > 0 ? max(-b + t3, -b - t3) : min(-b + t3, -b - t3));
			t2 = __gcd(A, B);
			A /= t2;
			if (B == t2) cout << A << '\n';
			else {
				B /= t2;
				if ((A < 0) ^ (B < 0)) cout << '-';
				cout << abs(A) << '/' << abs(B) << '\n';
			}
		} else {
			B = a << 1, A = -b;
			t2 = __gcd(A, B);
			A /= t2, t3 = B / t2;
			if (A) {
				if ((A < 0) ^ (t3 < 0)) cout << '-';
				cout << abs(A);
				if (abs(t3) != 1) cout << '/' << abs(t3);
				cout << '+';
			}
			t3 = 1;
			for (int i = 2, j = 4; i <= M && j <= t; ++i, j = i * i)
				while (!(t % j)) {
					t3 *= i,
					t /= j;
				}
			B = abs(B);
			t2 = __gcd(t3, B);
			t3 /= t2, B /= t2;
			if (t3 != 1) cout << t3 << '*';
			cout << "sqrt(" << t << ')';
			if (B != 1) cout << '/' << B;
			cout << '\n';
		}
	}
	by Rick Astley
}