diff --git a/1.cpp b/1.cpp
index fedde2c..fe2f3e3 100644
--- a/1.cpp
+++ b/1.cpp
@@ -1,32 +1,35 @@
 #include <iostream>
 #include <string>
 #include <math.h>
-
+#include<cassert>
 using namespace std;
 
-long long *b;
+//long long int* m;
+void test_factorial();
 
 long long int factorial(int n)
 {
 	return (n == 1 || n == 0) ? 1 : factorial(n - 1) * n;
 }
 
-long long int *producingTheFactorialFractions()
+long long int* producingTheFactorialFractions()
 {
-    long long b[10];
-
-	for (int i = 10; i >= 0; i--)
-	{
-		b[i] += (int)pow(factorial(10), 2.0) / (i + 1);
+	long long int b[10] = { 0 };
+	//int i = 10
+	long long int m;
+	for (int i = 9; i >= 0; i--)
+	{			//(int)
+		m = (long long int)pow(factorial(10), 2.0);
+		b[i] += (long long int)pow(factorial(10), 2.0) / (i + 1);
 	}
 	return b;
 }
 
-void checkZeros(long long *a)
+void checkZeros(long long int a[10])
 {
 	for (int i = 9; i >= 0; i--)
-	{
-		if (a[i] = 0)
+	{	//a[i] = 0
+		if (a[0] == 0)
 			cout << "Zero Found" << endl;
 	}
 }
@@ -34,17 +37,26 @@ void checkZeros(long long *a)
 int main()
 {
 
-	long long int *a;
+	long long int* a;
+	//
+	a = new long long int[10];
 	a = producingTheFactorialFractions();
-	checkZeros(a);
+
+	long long int a2[10];
 	for (int i = 0; i < 10; i++)
-	{
-		cout << a[i] << endl;
-	}
-	delete a;
+		a2[i] = a[i];
 
-	cout<<"hello";
-	cout<<"Bye";
+	checkZeros(a2);
 
+	for (int i = 0; i < 10; i++)
+	{
+		cout << a2[i] << endl;
+	}
+	//delete[] a;
+}
 
-}
\ No newline at end of file
+void test_factorial()
+{
+	long long int a = factorial(10);
+	assert(a == 3628800);
+}
diff --git a/2.cpp b/2.cpp
index 6a27746..5dabfdd 100644
--- a/2.cpp
+++ b/2.cpp
@@ -5,11 +5,15 @@ using namespace std;
 
 // count all the specific char in the whole array of strings
 int countAllSpecificChars(string sArr[], int arrLength, char specificChar) {
-    int count;
-    for (int i = 0; i <= arrLength; ++i)
-        for (int j = 0; j <= sArr[i].size(); ++j)
+    //int count;
+    int count = 0;
+    //i <= arrLength
+    for (int i = 0; i < arrLength; ++i)
+        // j <= sArr[i].size()
+        for (int j = 0; j < sArr[i].size(); ++j)
             // if the jth char of the string is the specific char
-            if (sArr[i][j] = specificChar)
+                    //sArr[i][j] = specificChar
+            if (sArr[i][j] == specificChar)
                 count++;
     return count;
 }
diff --git a/3.cpp b/3.cpp
index 77eb722..a36d6ed 100644
--- a/3.cpp
+++ b/3.cpp
@@ -1,22 +1,33 @@
 #include<stdio.h>
 #include<stdlib.h>
+#pragma warning(disable:4996)
 #define MAX_SIZE 200
-int arr[MAX_SIZE];
+//int arr[MAX_SIZE];
+long long arr[MAX_SIZE];
 
-typedef struct alfa * alfaptr;
+
+typedef struct alfa* alfaptr;
 
 struct alfa {
 	long long x;
 	alfaptr next;
 };
 alfaptr rear = NULL, front = NULL;
-void push(int x)
+
+//int x
+void push(long long x)
 {
 	alfaptr node;
 	node = (alfaptr)malloc(sizeof(struct alfa));
 	node->x = x;
+	//
+	node->next = NULL;
 	if (!front)
+	{
 		front = node;
+		//
+		rear = node;
+	}
 	else {
 		rear->next = node;
 		rear = node;
@@ -25,33 +36,57 @@ void push(int x)
 
 void pop()
 {
-	alfaptr node;
 	if (!front)
 		printf("ERROR1");
 	else
 	{
-		node = front->next;
-		front = node;
+		//
+		alfaptr node = front;
+		//node = front->next;
+		//front = node;
+		//
+		front = node->next;
+		free(node);
 	}
 }
-void search(int x)
+
+//int
+void search(long long x)
 {
 	alfaptr node = front;
 	int counter = 0;
 	while (node)
+		//{}
+	{
 		if (node->x == x)
+		{
+			//
+			counter++;
 			printf("%d", counter);
+		}
 		else {
 			printf("ERROR2");
-			break;
+			//break;
 		}
 		node = node->next;
+	}
 }
 
 void rpop() {//pop last element
+
+	//
+	if (front == rear)
+	{
+		front = NULL;
+		rear = NULL;
+		return;
+	}
 	alfaptr node = front;
-	while (node)
+	//node
+	while (node->next != rear)
 		node = node->next;
+	//
+	node->next = NULL;
 	free(rear);
 	rear = node;
 }
@@ -66,9 +101,13 @@ void set()
 int size()
 {
 	alfaptr node = front;
-	int count;
+	//count
+	int count = 0;
 	while (node)
-		count++;node = node->next;
+	{
+		count++;
+		node = node->next;
+	}
 	return count;
 }
 
@@ -76,7 +115,7 @@ void show()
 {
 	if (!front) {
 		for (int i = 0; i < MAX_SIZE; i++)
-			printf("%d ", arr[i]);
+			printf("%lld ", arr[i]);
 	}
 	else
 	{
@@ -84,11 +123,13 @@ void show()
 	}
 }
 
-int average()
+//long long
+long long average()
 {
 
 	alfaptr node = front;
-	int sum = 0, count;
+	//int			//count
+	long long sum = 0, count = 0;
 	while (node) {
 		sum += node->x;
 		count++;