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hELLO ยท Designed By ์ •์ƒ์šฐ.
Rainbow๐ŸŒˆCoder

My dev Note๐Ÿ“’

์ž๋ฃŒ๊ตฌ์กฐ์™€ ์•Œ๊ณ ๋ฆฌ์ฆ˜/์ž๋ฃŒ๊ตฌ์กฐ

[C++]์›ํ˜•ํ ๊ตฌํ˜„, ์ค„์„œ๊ธฐ ์˜ˆ์‹œ

2021. 12. 15. 20:46
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ํ๋Š” ๊ฐ€์žฅ ๋จผ์ € ์ž…๋ ฅํ•œ ์ž๋ฃŒ๋ฅผ ๊ฐ€์žฅ ๋จผ์ € ์ถœ๋ ฅํ•˜๊ณ  ์‹ถ์„ ๋•Œ ์‚ฌ์šฉํ•œ๋‹ค.

 

์ •๋ฅ˜์žฅ์—์„œ, ์‚ฌ๋žŒ๋“ค์ด ์ค„์ง€์–ด ์„œ์„œ ๊ธฐ๋‹ค๋ฆฌ๋‹ค๊ฐ€

๋ฒ„์Šค๊ฐ€ ์˜ค๋ฉด ์ˆœ์„œ๋Œ€๋กœ ํƒ€๋Š” ์˜ˆ์˜๋ฒ”์ ˆ์„ ์ƒ๊ฐํ•˜๋ฉด ๋œ๋‹ค.

 

ํ๋ฅผ ๊ตฌํ˜„ํ•˜๋Š” ๊ธฐ๋ณธ idea๋Š”

๋ฐฐ์—ด ๋‚ด head(์ฒ˜์Œ ์„  ์‚ฌ๋žŒ)์™€ tail(๋งˆ์ง€๋ง‰์— ์„  ์‚ฌ๋žŒ) ์ธ๋ฑ์Šค์„ ์žก๊ณ 

enqueue(์ค„์ด ๊ธธ์–ด์ง€๋Š” ์ƒํƒœ) ํ•  ๋•Œ๋งˆ๋‹ค tail++;

dequeue(์•ž์‚ฌ๋žŒ๋ถ€ํ„ฐ ๋ฒ„์Šค์— ํƒ€์„œ ์ค„์ด ์งง์•„์ง€๋Š” ์ƒํƒœ) ํ•  ๋•Œ๋งˆ๋‹ค head++;์„ ํ•˜๋Š” ๊ฒƒ์ด๋‹ค.

ํ•˜์ง€๋งŒ ๋ฐฐ์—ด์„ ์•„์ฃผ ํฌ๊ฒŒ ์žก์ง€ ์•Š๋Š” ๊ฒฝ์šฐ, ํ์˜ ๋ฐฐ์—ด ํฌ๊ธฐ ๋งˆ์ง€๋ง‰๊นŒ์ง€ head๊ฐ€ ๋„๋‹ฌํ•˜์—ฌ

์•ž์ชฝ์˜ ๋นˆ ๋ฐฐ์—ด(head๊ฐ€ ๊ฑฐ์ณ์ง€๋‚˜๊ฐ„)๋“ค์„ ์žฌํ™œ์šฉํ•  ์ˆ˜ ์—†์–ด ๋ฉ”๋ชจ๋ฆฌ๋‚ญ๋น„๊ฐ€ ์‹ฌํ•œ ํŽธ์ด๋‹ค.

 

๊ทธ๋Ÿฌ๋ฏ€๋กœ ์›ํ˜•ํ๋ฅผ ์“ด๋‹ค๋ฉด ์„ ํ˜• ํ์— ๋น„ํ•˜์—ฌ

๋™์ผํ•œ ๋ฐฐ์—ด์ด์ง€๋งŒ ๊พธ์ค€ํ•˜๊ฒŒ head๊ฐ€ ๊ฑฐ์ณ์ง€๋‚˜๊ฐ„ ์ธ๋ฑ์Šค๋“ค์„ ์žฌํ™œ์šฉํ•  ์ˆ˜ ์žˆ์–ด ๋ฉ”๋ชจ๋ฆฌ ํ™œ์šฉ ์ธก๋ฉด์—์„œ ๋” ์ข‹๋‹ค.

์›ํ˜•ํ์˜ idea๋Š” ์„ ํ˜•ํ์˜ ์ฒ˜์Œ๊ณผ ๋์ด ์ด์–ด์ ธ ์žˆ๋‹ค๊ณ  ์ƒ๊ฐํ•˜๋Š” ๊ฒƒ์ด๋‹ค.

๊ทธ๋Ÿผ ํ•œ ์ค„์ด์—ˆ๋˜ ํ๊ฐ€ ๊ฐ•๊ฐ•์ˆ ๋ž˜๋ฅผ ํ•˜๋“ฏ ์›์„ ์ด๋ฃจ๊ฒŒ ๋œ๋‹ค.

enqueue๋ฅผ ํ•˜๋“  dequeue๋ฅผ ํ•˜๋“ 

์žก์•„๋†“์€ ๋ฐฐ์—ด ํฌ๊ธฐ, ์ƒ์ƒ ์† ์› ์•ˆ์—์„œ ์ธ๋ฑ์Šค๋ฅผ ์˜ฎ๊ธฐ๋ฉด์„œ ๊ณ„์† ๋น™๊ธ€๋น™๊ธ€ ๋Œ์•„๊ฐ€๊ฒŒ๋” ๋งŒ๋“ค์–ด์ฃผ๋ฉด ๋œ๋‹ค.

enqueue๋ฅผ ํ•  ๋•Œ tail++;๋Œ€์‹ ์— tail = (tail + 1) % Queue_capacity;

dequeue๋ฅผ ํ•  ๋•Œ head++;๋Œ€์‹ ์— head = (head + 1) % Queue_capacity;

๋กœ์ง์„ ์“ฐ๋Š” ๊ฒƒ์ด ํ•ต์‹ฌ์ด๋‹ค.

 

 

#include <iostream>

using namespace std;

#define Queue_capacity 10

int queueLine[Queue_capacity];
int head = 0;
int tail = -1;
int queue_size = 0;

void enqueue(int n)
{
	if (queue_size == Queue_capacity)
	{
		cout << "Queue_full" << '\n';
		return;
	}
	tail = (tail + 1) % Queue_capacity;
	queue_size++;
	queueLine[tail] = n;
}

int dequeue()
{
	int r;
	if (queue_size == 0)
	{
		cout << "Queue_empty" << '\n';
		return 0;
	}
	r = queueLine[head]; 
	head = (head + 1) % Queue_capacity;
	queue_size--;
	return r;
}

int main() {
	int number, r;
	do {
		cout << "input number: ";
		cin >> number;
		if (number > 0)enqueue(number);
		else if (number == 0)
		{
			r = dequeue();
			cout << r;
		}
	} while (number >= 0);
	return 0;
}

 

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