哪位大佬告诉我哪里错了（比赛时写的，得分非常惨）

#include<bits/stdc++.h>
using namespace std;
map<pair<int, int>, int> mp;
int gcd(int a, int b) {
    if (mp.count({a, b}))
        return mp[{a, b}];
    if (a == 0)return b;
    else return mp[{a, b}] = gcd(b % a, a);
}
int lcm(int a, int b) {
    return a * b / gcd(a, b);
}
pair<int, int> fun(int x) {
    int s = 1;
    for (int i = 2; i * i <= x; i++)
        if (x % (i * i) == 0) {
            x /= (i * i);
            s *= i;
            i--;
        }
    return make_pair(s, x);
}
struct Faction {
    int a, b;
    Faction(int _A = 1, int _B = 1): a(_A), b(_B) {this -> cut();}
    Faction operator + (const Faction &x) const {
        Faction c;
        int l = lcm(b, x.b);
        int t1, t2;
        t1 = a * (l / b);
        t2 = x.a * (l / x.b);
        c = Faction(t1 + t2, l);
        c.cut();
        return c;
    }
    Faction operator - (const Faction &x) const {
        Faction c;
        int l = lcm(b, x.b);
        int t1, t2;
        t1 = a * (l / b);
        t2 = x.a * (l / x.b);
        c = Faction(t1 - t2, l);
        c.cut();
        return c;
    }
    void operator = (const Faction &x) {
        a = x.a, b = x.b;
        return ;
    }
    void cut() {
        if (b < 0 && a < 0)a = -a, b = -b;
        if (b < 0 && a > 0)a = -a, b = -b;
        if (a == 0)b = 1;
        int t = gcd(a, b);
        a /= t;
        b /= t;
    }
    void output() {
        this -> cut();
        if (a == 0)printf("0");
        else if (b == 1)printf("%d", a);
        else if (b == -1)printf("%d", -a);
        else if (a > 0 && b < 0)printf("%d/%d", -a, -b);
        else printf("%d/%d", a, b);
    }
    void output_r() {
        this -> cut();
        swap(a, b);
        if (a == 0)printf("0");
        else if (b == 1)printf("%d", a);
        else if (b == -1)printf("%d", -a);
        else if (a > 0 && b < 0)printf("%d/%d", -a, -b);
        else printf("%d/%d", a, b);
    }
};
int t, m;
int check(int x) {
    int sq = sqrt(x + 0.001d);
    if (sq * sq == x)return sq;
    else return -1;
}
void print_sqrt(int x) {
    printf("sqrt(%d)", x);
    return ;
}
int main() {
    freopen("uqe.in", "r", stdin);
    freopen("uqe.out", "w", stdout);
    scanf("%d%d", &t, &m);
    int a, b, c;
    while (t--) {
        scanf("%d%d%d", &a, &b, &c);
        //Delta
        int t1 = b * b, t2 = 4 * a * c;
        if (t1 < t2) {
            printf("NO\n");
            continue;
        }
        if (t1 == t2) {
            Faction ans(-b, 2 * a);
            ans.output();
            printf("\n");
            continue;
        }
        int delta = t1 - t2;
        int temp = check(delta);
        if (temp != -1) {
            int x = -b, y = temp;
            Faction s(x + y, 2 * a);
            s.output();
            printf("\n");
            continue;
        }
        Faction Tmp;
        Tmp = Faction(-b, 2 * a);
        Tmp.cut();
        bool flag = false;
        if (Tmp.a == 0)flag = true;
        else {
            Tmp.output();
        }
        pair<int, int> tmp = fun(delta);
        int &x = tmp.first, &y = tmp.second;
        if (x % 2) {
            if (x % a == 0) {
                x /= a;
                if (x == 1) {
                    if (b != 0)printf("+");
                    print_sqrt(y);
                } else {
                    if (x > 0)
                        if (b != 0)printf("+%d*", abs(x));
                        else printf("%d*", abs(x));
                    else printf("-%d*", abs(x));
                    print_sqrt(y);
                }
                printf("/%d\n", 2);
                continue;
            }
            int tmp = gcd(a, x);
            if (tmp > 1) {
                x /= tmp;
                a /= tmp;
                if (x == 1) {
                    if (b != 0)printf("+");
                    print_sqrt(y);
                } else {
                    if (x > 0)
                        if (b != 0)printf("+%d*", abs(x));
                        else printf("%d*", abs(x));
                    else printf("-%d*", abs(x));
                    print_sqrt(y);
                }
                printf("%d\n", 2 * a);
            } else {
                if (x == 1) {
                    if (b != 0)printf("+");
                    print_sqrt(y);
                } else {
                    if (x > 0)
                        if (b != 0)printf("+%d*", abs(x));
                        else printf("%d*", abs(x));
                    else printf("-%d*", abs(x));
                    print_sqrt(y);
                }
                printf("%d\n", 2 * a);
            }
        } else {
            x /= 2;
            if (x % a == 0) {
                x /= a;
                if (x == 1) {
                    if (b != 0)printf("+");
                    print_sqrt(y);
                } else {
                    if (x > 0)
                        if (b != 0)printf("+%d*", abs(x));
                        else printf("%d*", abs(x));
                    else printf("-%d*", -x);
                    print_sqrt(y);
                }
                printf("\n");
                continue;
            }
            int tmp = gcd(a, x);
            if (tmp > 1) {
                x /= tmp;
                a /= tmp;
                if (x == 1) {
                    if (b != 0)printf("+");
                    print_sqrt(y);
                } else {
                    if (x > 0)
                        if (b != 0)printf("+%d*", abs(x));
                        else printf("%d*", abs(x));
                    else printf("-%d*", -x);
                    print_sqrt(y);
                }
                printf("/%d\n", a);
            }
            else {
                if (x == 1) {
                    if (b != 0)printf("+");
                    print_sqrt(y);
                } else {
                    if (x > 0)
                        if (b != 0)printf("+%d*", abs(x));
                        else printf("%d*", abs(x));
                    else printf("-%d*", -x);
                    print_sqrt(y);
                }
                printf("/%d\n", a);
            }
        }
    }
    return 0;
}