AiSD LAB - Drzewo kwadratów

#include <iostream>
#include <string>
#include <cmath>

using namespace std;

int Size;

float getMin(float a, float b, float c, float d){
    float tmp = a;
    if(tmp > b)
        tmp = b;
    if(tmp > c)
        tmp = c;
    if(tmp > d)
        tmp = d;
    return tmp;
}

float getMax(float a, float b, float c, float d){
    float tmp = a;
    if(tmp < b)
        tmp = b;
    if(tmp < c)
        tmp = c;
    if(tmp < d)
        tmp = d;
    return tmp;
}

struct STree{
    float Value;
    float XL, XR;
    float YD, YU;
    int   MyNumber;
    int   Children;
    STree* Root;
    STree* Child1;
    STree* Child2;
    STree* Child3;
    STree* Child4;
    bool Parent(){
        if(Children == 0)
            return false;
        else
            return true;
    }
    void SetSize(int size = 0){
        if(Root == NULL){
            XL = YD = 0;
            XR = YU = size;
        }
        else{
            if(MyNumber == 1){
                XL = Root->XL;
                XR = Root->XR/2;
                YU = Root->YU;
                YD = Root->YU/2;
            }
            else if(MyNumber == 2){
                XL = Root->XR/2;
                XR = Root->XR;
                YU = Root->YU;
                YD = Root->YU/2;
            }
            else if(MyNumber == 3){
                XL = Root->XL;
                XR = Root->XR/2;
                YU = Root->YU/2;
                YD = Root->YD;
            }
            else if(MyNumber == 4){
                XL = Root->XR/2;
                XR = Root->XR;
                YU = Root->YU/2;
                YD = Root->YD;
            }
        }
    }
    void AddChild(STree* root){
        if(Child1 == NULL){
            root->Children++;
            STree* child = new STree;
            child->Root = root;
            child->MyNumber = 1;
            child->SetSize();
            root->Child1 = child;
        }
        else if(Child2 == NULL){
            root->Children++;
            STree* child = new STree;
            child->Root = root;
            child->MyNumber = 2;
            child->SetSize();
            root->Child2 = child;
        }
        else if(Child3 == NULL){
            root->Children++;
            STree* child = new STree;
            child->Root = root;
            child->MyNumber = 3;
            child->SetSize();
            root->Child3 = child;
        }
        else if(Child4 == NULL){
            root->Children++;
            STree* child = new STree;
            child->Root = root;
            child->MyNumber = 4;
            child->SetSize();
            root->Child4 = child;
        }
    }
    void SetValue(int x, int y, float val, STree* node){
        if(XR - XL == 1 && YU - YD == 1){
            Value = val;
        }
        else{
            while(Children < 4)
                AddChild(node);
            if(x < XR/2 && y < YU/2){
                Child3->SetValue(x,y,val,Child3);
            }
            else if(x >= XR/2 && y < YU/2){
                Child4->SetValue(x,y,val,Child4);
            }
            else if(x < XR/2 && y >= YU/2){
                Child1->SetValue(x,y,val,Child1);
            }
            else if(x >= XR/2 && y >= YU/2){
                Child2->SetValue(x,y,val,Child2);
            }
            Meld(node);
        }
    }
    void Meld(STree* node){
        if(!Child1->Parent() && !Child2->Parent() && !Child3->Parent() && !Child4->Parent()){
            if(getMax(Child1->Value, Child2->Value, Child3->Value, Child4->Value) - getMin(Child1->Value, Child2->Value, Child3->Value, Child4->Value) < 2){
                Value = (Child1->Value+Child2->Value+Child3->Value+Child4->Value)/4;
                delete Child1;
                delete Child2;
                delete Child3;
                delete Child4;
                Children = 0;
            }
        }
    }
    void Print(){
        if(Children == 0)
            cout << XL << "," << XR << "," << YU << "," << YD << ":" << Value << endl;
        else{
            if(Child1 != NULL){
                Child1->Print();
            }
            if(Child2 != NULL){
                Child2->Print();
            }
            if(Child3 != NULL){
                Child3->Print();
            }
            if(Child4 != NULL){
                Child4->Print();
            }
        }
    }
    STree(){
        Root = NULL;
        Child1 = Child2 = Child3 = Child4 = NULL;
        Value = 0;
        MyNumber = 0;
        XL = XR = YU = YD = 0;
        Children = 0;
    }
};

STree* First = new STree;

int main(){
    cout << "Podaj wymiar kwadratu" << endl;
    cin >> Size;
    First->SetSize(Size);
    string input;
    while(input != "exit"){
        input.clear();
        cin >> input;
        if(input == "set"){
            int x, y; float v;
            cin >> x >> y >> v;
            First->SetValue(x,y,v,First);
        }
        else if(input == "print"){
            First->Print();
        }
    }
    return 0;
}