Merge pull request #38 from artemiipatov/test3Rewriting1Task2

Test 3 rewriting 1 tasks 2, 3
artemiipatov · Feb 19, 2022 · 834d29d · 834d29d
2 parents 4a46f9d + 0c09950
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diff --git a/Test3Rewriting1Task2/Test3Rewriting1Task2.sln b/Test3Rewriting1Task2/Test3Rewriting1Task2.sln
@@ -0,0 +1,31 @@
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diff --git a/Test3Rewriting1Task2/Test3Rewriting1Task2/Test3Rewriting1Task2.vcxproj b/Test3Rewriting1Task2/Test3Rewriting1Task2/Test3Rewriting1Task2.vcxproj
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diff --git a/Test3Rewriting1Task2/Test3Rewriting1Task2/Test3Rewriting1Task2.vcxproj.filters b/Test3Rewriting1Task2/Test3Rewriting1Task2/Test3Rewriting1Task2.vcxproj.filters
@@ -0,0 +1,36 @@
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diff --git a/Test3Rewriting1Task2/Test3Rewriting1Task2/main.c b/Test3Rewriting1Task2/Test3Rewriting1Task2/main.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+#include "tests.h"
+
+int main()
+{
+    if (!queuePassedTests())
+    {
+        return -1;
+    }
+    return 0;
+}
diff --git a/Test3Rewriting1Task2/Test3Rewriting1Task2/queue.c b/Test3Rewriting1Task2/Test3Rewriting1Task2/queue.c
@@ -0,0 +1,109 @@
+#define _CRT_SECURE_NO_WARNINGS
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include "queue.h"
+
+typedef struct QueueElement
+{
+    int value;
+    int priority;
+    struct QueueElement* next;
+} QueueElement;
+
+typedef struct Queue
+{
+    QueueElement* tail;
+    QueueElement* head;
+} Queue;
+
+Queue* createQueue()
+{
+    return calloc(1, sizeof(Queue));
+}
+
+bool isEmpty(Queue* queue)
+{
+    return queue == NULL || queue->head == NULL;
+}
+
+void deleteQueue(Queue** queue)
+{
+    QueueElement* position = (*queue)->head;
+    while (position != NULL)
+    {
+        (*queue)->head = (*queue)->head->next;
+        free(position);
+        position = (*queue)->head;
+    }
+    free(*queue);
+    *queue = NULL;
+}
+
+bool enqueue(Queue* queue, int value, int priority)
+{
+    QueueElement* newElement = calloc(1, sizeof(QueueElement));
+    if (newElement == NULL)
+    {
+        return false;
+    }
+    newElement->value = value;
+    newElement->priority = priority;
+    if (queue->head == NULL)
+    {
+        queue->head = newElement;
+        queue->tail = queue->head;
+        return true;
+    }
+    queue->tail->next = newElement;
+    queue->tail = newElement;
+    return true;
+}
+
+int dequeue(Queue* queue)
+{
+    if (queue->head == NULL)
+    {
+        return -1;
+    }
+    QueueElement* currentElement = queue->head->next;
+    QueueElement* elementBeforeMaximum = queue->head;
+    QueueElement* assistantElement = queue->head;
+    int maximumPriority = INT_MIN;
+    while (currentElement != NULL)
+    {
+        if (currentElement->priority > maximumPriority)
+        {
+            maximumPriority = currentElement->priority;
+            elementBeforeMaximum = assistantElement;
+        }
+        assistantElement = assistantElement->next;
+        currentElement = currentElement->next;
+    }
+    int result = 0;
+    if (maximumPriority <= queue->head->priority)
+    {
+        result = queue->head->value;
+        QueueElement* temp = queue->head->next;
+        free(queue->head);
+        queue->head = temp;
+        queue->tail = queue->head == NULL ? NULL : queue->tail;
+    }
+    else if (queue->head->next == NULL)
+    {
+        result = queue->head->value;
+        free(queue->head);
+        queue->head = NULL;
+        queue->tail = NULL;
+    }
+    else
+    {
+        result = elementBeforeMaximum->next->value;
+        QueueElement* temp = elementBeforeMaximum->next->next;
+        free(elementBeforeMaximum->next);
+        elementBeforeMaximum->next = temp;
+    }
+    return result;
+}
diff --git a/Test3Rewriting1Task2/Test3Rewriting1Task2/queue.h b/Test3Rewriting1Task2/Test3Rewriting1Task2/queue.h
@@ -0,0 +1,16 @@
+#pragma once
+
+// queue structure
+typedef struct Queue Queue;
+
+// creates queue
+Queue* createQueue();
+
+// deletes queue
+void deleteQueue(Queue** queue);
+
+// adds element with given key and priority at the tail of the queue
+bool enqueue(Queue* queue, int value, int priority);
+
+// delete element with maximum priority and returns its value
+int dequeue(Queue* queue);