[Deque] Add array-based Deque

deunlee · May 25, 2020 · 700dd49 · 700dd49
1 parent bca2cb2
commit 700dd49
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diff --git a/Data-Structure.sln b/Data-Structure.sln
@@ -9,6 +9,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Queue", "Queue\Queue.vcxpro
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+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Deque", "Deque\Deque.vcxproj", "{88D1A79E-BB93-46A3-A9A9-18BED3527596}"
+EndProject
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diff --git a/Deque/Deque.cpp b/Deque/Deque.cpp
@@ -0,0 +1,127 @@
+#include "Deque.h"
+
+namespace Deun {
+ Deque::Deque(unsigned int size) {
+ this->size = size;
+ count = front = rear = 0;
+ elements = new (std::nothrow) int[size];
+
+ if (!elements) {
+ this->size = 0;
+ throw DequeError::DEQUE_ALLOCATION_FAILED;
+ }
+ }
+
+ Deque::~Deque() {
+ delete[] elements;
+ }
+
+ bool Deque::isEmpty() {
+ return (count == 0);
+ }
+
+ bool Deque::isFull() {
+ return (count == size);
+ }
+
+ unsigned int Deque::getSize() {
+ return size;
+ }
+
+ unsigned int Deque::getCount() {
+ return count;
+ }
+
+ inline unsigned int safeMove(unsigned int basis, int diff) {
+ return basis;
+ }
+
+ // front : 채워진 상태 (단, count가 0이면 비워져 있음)
+ // rear : 비어있는 상태 (단, count가 size면 채워져 있음)
+
+ bool Deque::pushFront(int element) {
+ if (isFull()) {
+ return false;
+ }
+
+ count++;
+ front = (size - 1 + front) % size; // 사실 안전한 방법은 아님
+ //front = (front - 1 + size) % size; // 이건 더 위험함 (front는 unsigned)
+ elements[front] = element;
+ return true;
+ }
+
+ bool Deque::pushRear(int element) {
+ if (isFull()) {
+ return false;
+ }
+
+ // 큐의 enqueue()와 동일
+ count++;
+ elements[rear] = element;
+ rear = (rear + 1) % size;
+ return true;
+ }
+
+ int Deque::popFront() {
+ if (isEmpty()) {
+ throw DequeError::DEQUE_IS_EMPTY;
+ }
+
+ // 큐의 dequeue()와 동일
+ count--;
+ int result = elements[front];
+ front = (front + 1) % size;
+ return result;
+ }
+
+ int Deque::popRear() {
+ if (isEmpty()) {
+ throw DequeError::DEQUE_IS_EMPTY;
+ }
+
+ count--;
+ rear = (size - 1 + rear) % size;
+ return elements[rear];
+ }
+
+ int Deque::peekFront() {
+ if (isEmpty()) {
+ throw DequeError::DEQUE_IS_EMPTY;
+ }
+
+ return elements[front];
+ }
+
+ int Deque::peekRear() {
+ if (isEmpty()) {
+ throw DequeError::DEQUE_IS_EMPTY;
+ }
+
+ return elements[(size - 1 + rear) % size];
+ }
+
+ // for debug
+ void Deque::clear() {
+ for (unsigned int i = 0; i < size; i++) {
+ elements[i] = 0;
+ }
+ }
+
+ // for debug
+ void Deque::print() {
+ using namespace std;
+
+ cout << "Deque(size=" << size << ", count=" << count;
+ cout << ", front=" << front << ", rear=" << rear << ")" << endl;
+
+ for (unsigned int i = 0; i < size; i++) {
+ cout << elements[i];
+ if (i == front) cout << "F";
+ if (i == rear) cout << "R";
+ cout << "\t";
+ }
+
+ cout << endl;
+ }
+}
diff --git a/Deque/Deque.h b/Deque/Deque.h
@@ -0,0 +1,45 @@
+#ifndef __DEUN_DEQUE__
+#define __DEUN_DEQUE__
+
+#include <iostream>
+#include <new>
+
+namespace Deun {
+ enum class DequeError {
+ DEQUE_ALLOCATION_FAILED,
+ DEQUE_IS_EMPTY,
+ };
+
+ // 배열 기반 원형 덱
+ class Deque {
+ private:
+ int* elements;
+ unsigned int size; // 덱의 크기 (배열 원소의 개수)
+ unsigned int count; // 채워진 원소의 개수
+ unsigned int front; // 원소를 삭제할 자리
+ unsigned int rear; // 원소를 삽입할 자리
+
+ public:
+ Deque(unsigned int size = 100);
+ ~Deque();
+
+ bool isEmpty();
+ bool isFull();
+
+ unsigned int getSize(); // 전체 크기 반환
+ unsigned int getCount(); // 채워진 원소의 개수 반환
+
+ bool pushFront(int element); // 맨 앞에 원소 삽입 (성공 = true, 실패 = false)
+ bool pushRear(int element); // 맨 뒤에 원소 삽입 (성공 = true, 실패 = false)
+ int popFront(); // 맨 앞 원소 반환 및 삭제 (실패 = throw)
+ int popRear(); // 맨 뒤 원소 반환 및 삭제 (실패 = throw)
+ int peekFront(); // 맨 앞 원소 반환 (실패 = throw)
+ int peekRear(); // 맨 뒤 원소 반환 (실패 = throw)
+
+ // for debug
+ void clear();
+ void print();
+ };
+}
+
+#endif
diff --git a/Deque/Deque.vcxproj b/Deque/Deque.vcxproj
@@ -0,0 +1,159 @@
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