diff --git a/Test1_L02.cpp b/Test1_L02.cpp
deleted file mode 100644
index e3d4a77..0000000
--- a/Test1_L02.cpp
+++ /dev/null
@@ -1,281 +0,0 @@
-#include <cmath>
-#include <iostream>
-
-using namespace std;
-
-#define EPSILON 1E-10
-
-struct Point {
-    double x;
-    double y;
-    string name;
-    Point *next;
-    Point()
-    {
-        this->x = 0;
-        this->y = 0;
-        this->name = "";
-        this->next = nullptr;
-    }
-    Point(Point *p)
-    {
-        this->x = p->x;
-        this->y = p->y;
-        this->name = p->name;
-        this->next = nullptr;
-    }
-    Point(double x, double y, string name)
-    {
-        this->x = x;
-        this->y = y;
-        this->name = name;
-        this->next = nullptr;
-    }
-};
-
-void appendPoint(Point *&pHead, Point *newPoint)
-{
-    if (pHead == nullptr) {
-        pHead = newPoint;
-        return;
-    }
-    Point *temp = pHead;
-    while (temp->next != nullptr)
-        temp = temp->next;
-    temp->next = newPoint;
-}
-
-double distancePointToLine(Point *point, double a, double b, double c)
-{
-    if (point == nullptr)
-        return -1;
-    return abs(a * point->x + b * point->y + c) / sqrt(a * a + b * b);
-}
-
-Point *listPoint(Point *pHead, double a, double b, double c, double H)
-{
-    Point *newList = nullptr;
-    Point *temp = pHead;
-    while (temp != nullptr) {
-        if (distancePointToLine(temp, a, b, c) >= H) {
-            Point *newPoint = new Point(temp);
-            appendPoint(newList, newPoint);
-        }
-        temp = temp->next;
-    }
-    return newList;
-}
-
-double distanceBetweenTwoPoint(Point *point1, Point *point2)
-{
-    if (point1 == nullptr || point2 == nullptr)
-        return -1;
-    return sqrt(pow(point1->x - point2->x, 2) + pow(point1->y - point2->y, 2));
-}
-
-void printLineFromTwoPoint(Point *point1, Point *point2)
-{
-    if (point1 == nullptr || point2 == nullptr) {
-        cout << "Diem 1 hoac diem 2 chua xac dinh!" << endl;
-        return;
-    }
-    if (distanceBetweenTwoPoint(point1, point2) < EPSILON) {
-        cout << "Hai diem da cho trung nhau!" << endl;
-        return;
-    }
-    double a = (point1->y - point2->y);
-    double b = (point2->x - point1->x);
-    double c = a * (-point1->x) + b * (-point1->y);
-    cout << a << " * x + " << b << " * y + " << c << " = 0" << endl;
-}
-
-void printAllLineFromPointList(Point *pHead)
-{
-    if (pHead == nullptr)
-        return;
-    Point *temp = pHead->next;
-    while (temp != nullptr) {
-        printLineFromTwoPoint(pHead, temp);
-        temp = temp->next;
-    }
-    printAllLineFromPointList(pHead->next);
-}
-
-void prependPoint(Point *&pHead, Point *&newPoint)
-{
-    newPoint->next = pHead;
-    pHead = newPoint;
-}
-
-Point *findPreMinPoint(Point *pHead, double a, double b, double c)
-{
-    if (pHead == nullptr)
-        return nullptr;
-    Point *preMinPoint = nullptr;
-    double minLenght = distancePointToLine(pHead, a, b, c);
-    Point *temp = pHead;
-    while (temp->next != nullptr) {
-        double distance = distancePointToLine(temp->next, a, b, c);
-        if (distance < minLenght) {
-            minLenght = distance;
-            preMinPoint = temp;
-        }
-        temp = temp->next;
-    }
-    return preMinPoint;
-}
-
-void sortDecreaseDistanceToLine(Point *&pHead, double a, double b, double c)
-{
-    if (pHead == nullptr)
-        return;
-    if (pHead->next == nullptr)
-        return;
-    Point *sortedList = nullptr;
-    while (pHead != nullptr) {
-        Point *temp = nullptr;
-        Point *preMinPoint = findPreMinPoint(pHead, a, b, c);
-        if (preMinPoint == nullptr) {
-            temp = pHead;
-            pHead = pHead->next;
-        } else {
-            temp = preMinPoint->next;
-            preMinPoint->next = temp->next;
-        }
-        prependPoint(sortedList, temp);
-    }
-    pHead = sortedList;
-}
-
-double sumAllDistanceToLine(Point *pHead, double a, double b, double c)
-{
-    if (pHead == nullptr)
-        return 0;
-    return distancePointToLine(pHead, a, b, c) + sumAllDistanceToLine(pHead->next, a, b, c);
-}
-
-bool isCyclicQuadrilateral(Point *a, Point *b, Point *c, Point *d)
-{
-    double ab = distanceBetweenTwoPoint(a, b);
-    double ac = distanceBetweenTwoPoint(a, c);
-    double ad = distanceBetweenTwoPoint(a, d);
-    double bc = distanceBetweenTwoPoint(b, c);
-    double bd = distanceBetweenTwoPoint(b, d);
-    double cd = distanceBetweenTwoPoint(c, d);
-    if (ab < EPSILON || ac < EPSILON || ad < EPSILON || bc < EPSILON || bd < EPSILON || cd < EPSILON)
-        return false;
-    double cosA = (ab * ab + ad * ad - bd * bd) / (2 * ab * ad);
-    double cosC = (bc * bc + cd * cd - bd * bd) / (2 * bc * cd);
-    if (abs(cosA + cosC) > EPSILON || abs(abs(cosA) - 1) < EPSILON || abs(abs(cosC) - 1) < EPSILON)
-        return false;
-    return true;
-}
-
-bool checkAndPrintCyclicQuadrilateral(Point *a, Point *b, Point *c, Point *d)
-{
-    bool check = isCyclicQuadrilateral(a, b, c, d);
-    if (check) {
-        cout << a->name << " " << b->name << " " << c->name << " " << d->name << endl;
-        return true;
-    }
-    return false;
-}
-
-void printAllCyclicQuadrilateral(Point *pHead)
-{
-    Point *a = pHead;
-    while (a != nullptr) {
-        Point *b = a->next;
-        while (b != nullptr) {
-            Point *c = b->next;
-            while (c != nullptr) {
-                Point *d = c->next;
-                while (d != nullptr) {
-                    if (checkAndPrintCyclicQuadrilateral(a, b, c, d)) {
-                    } else if (checkAndPrintCyclicQuadrilateral(a, b, d, c)) {
-                    } else if (checkAndPrintCyclicQuadrilateral(a, c, b, d)) {
-                    } else if (checkAndPrintCyclicQuadrilateral(a, c, d, b)) {
-                    } else if (checkAndPrintCyclicQuadrilateral(a, d, b, c)) {
-                    } else if (checkAndPrintCyclicQuadrilateral(a, d, c, b)) {
-                    } else if (checkAndPrintCyclicQuadrilateral(b, a, c, d)) {
-                    } else if (checkAndPrintCyclicQuadrilateral(b, a, d, c)) {
-                    } else if (checkAndPrintCyclicQuadrilateral(b, c, a, d)) {
-                    } else if (checkAndPrintCyclicQuadrilateral(b, c, d, a)) {
-                    } else if (checkAndPrintCyclicQuadrilateral(b, d, a, c)) {
-                    } else if (checkAndPrintCyclicQuadrilateral(b, d, c, a)) {
-                    } else if (checkAndPrintCyclicQuadrilateral(c, a, b, d)) {
-                    } else if (checkAndPrintCyclicQuadrilateral(c, a, d, b)) {
-                    } else if (checkAndPrintCyclicQuadrilateral(c, b, a, d)) {
-                    } else if (checkAndPrintCyclicQuadrilateral(c, b, d, a)) {
-                    } else if (checkAndPrintCyclicQuadrilateral(c, d, a, b)) {
-                    } else if (checkAndPrintCyclicQuadrilateral(c, d, b, a)) {
-                    } else if (checkAndPrintCyclicQuadrilateral(d, a, b, c)) {
-                    } else if (checkAndPrintCyclicQuadrilateral(d, a, c, b)) {
-                    } else if (checkAndPrintCyclicQuadrilateral(d, b, a, c)) {
-                    } else if (checkAndPrintCyclicQuadrilateral(d, b, c, a)) {
-                    } else if (checkAndPrintCyclicQuadrilateral(d, c, a, b)) {
-                    } else if (checkAndPrintCyclicQuadrilateral(d, c, b, a)) {
-                    }
-                    d = d->next;
-                }
-                c = c->next;
-            }
-            b = b->next;
-        }
-        a = a->next;
-    }
-}
-
-void printAllPointInList(Point *pHead)
-{
-    Point *temp = pHead;
-    while (temp != nullptr) {
-        cout << temp->name << " " << temp->x << " " << temp->y << endl;
-        temp = temp->next;
-    }
-}
-
-void clearPointList(Point *&pHead)
-{
-    while (pHead != nullptr) {
-        Point *temp = pHead;
-        pHead = pHead->next;
-        delete temp;
-    }
-}
-
-int main()
-{
-    Point *pHead = nullptr;
-    double x[] = {
-        2, 4, 6, 2, 4, 6, 2, 4, 6
-    };
-    double y[] = {
-        1, 1, 1, 3, 3, 3, 5, 5, 5
-    };
-    string name[] = {
-        "A", "B", "C", "D", "E", "F", "G", "H", "I"
-    };
-    for (int i = 0; i < 3; ++i) {
-        for (int j = 0; j < 3; ++j) {
-            Point *newPoint = new Point(x[i * 3 + j], y[i * 3 + j], name[i * 3 + j]);
-            cout << distancePointToLine(newPoint, 1, 0, 0) << endl;
-            prependPoint(pHead, newPoint);
-        }
-    }
-    printAllPointInList(pHead);
-    clearPointList(pHead);
-    for (int i = 0; i < 3; ++i) {
-        for (int j = 0; j < 3; ++j) {
-            Point *newPoint = new Point(x[i * 3 + j], y[i * 3 + j], name[i * 3 + j]);
-            cout << distancePointToLine(newPoint, 0, 1, 0) << endl;
-            appendPoint(pHead, newPoint);
-        }
-    }
-    printAllPointInList(pHead);
-    sortDecreaseDistanceToLine(pHead, 1, -1, 0);
-    printAllPointInList(pHead);
-    printAllLineFromPointList(pHead);
-    printAllCyclicQuadrilateral(pHead);
-    return 0;
-}