algorithm_lect/practice/queue.html at main · joygram/algorithm_lect · GitHub

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<!DOCTYPE html>
<html lang="ko">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
  <title>실습: 큐 | 자료구조</title>
  <link rel="stylesheet" href="../css/common.css">
</head>
<body>
  <header class="header">
    <h1>실습: 큐 (줄 서기)</h1>
    <p class="subtitle">뒤에 서고, 맨 앞 사람만 나가기</p>
    <div id="theme-switcher-wrap"></div>
  </header>
  <main class="practice-page">
    <a href="../index.html" class="back">← 목차</a>
    <a href="../lectures/02-2-큐.html" class="back">II단원 2. 큐 (강의)</a>

    <div class="practice-explanation" style="background: var(--callout-etymology-bg); border-left: 4px solid var(--callout-etymology-border); padding: 0.75rem 1rem; margin: 0.75rem 0; border-radius: 0 8px 8px 0;">
      <p><strong>큐</strong> = 뒤에 넣고, 앞에서만 뺌. <strong>FIFO</strong>(먼저 넣은 게 먼저 나옴). 연산: enqueue → <code>deque.append(값)</code>, dequeue → <code>deque.popleft()</code>. <strong>응용</strong> 대사 한 줄씩 나오는 창, BFS(가까운 정점부터 탐색), 프린터 대기열.</p>
    </div>
    <p>줄 서기와 같아요. <strong>뒤에 넣기</strong>를 누르면 줄 맨 뒤에 서고, <strong>앞에서 꺼내기</strong>를 누르면 <strong>맨 앞에 있는 사람만</strong> 나가요. 먼저 줄 선 사람이 먼저 나가는지 확인해 보세요.</p>

    <div class="controls">
      <input type="text" id="inputVal" placeholder="넣을 값 (예: 1번)" maxlength="6" aria-label="큐에 넣을 값">
      <button type="button" id="btnEnqueue">뒤에 넣기 (Enqueue)</button>
      <button type="button" id="btnDequeue">앞에서 꺼내기 (Dequeue)</button>
    </div>

    <div class="viz" id="viz" role="status" aria-live="polite">
      [ 맨 앞 ] — 비어 있음 — [ 맨 뒤 ]
    </div>

    <p class="hint">방금 나간 값: <strong id="lastDeq">—</strong></p>
  </main>
  <script>
    (function () {
      var queue = [];
      var viz = document.getElementById('viz');
      var lastDeq = document.getElementById('lastDeq');
      var inputVal = document.getElementById('inputVal');

      function render() {
        if (queue.length === 0) {
          viz.innerHTML = '[ 맨 앞 ] — 비어 있음 — [ 맨 뒤 ]';
          return;
        }
        var items = queue.map(function (x, i) {
          var label = (i === 0 ? ' Front ' : '') + (i === queue.length - 1 ? ' Rear' : '');
          return '<span class="viz-item">' + x + label + '</span>';
        }).join('');
        viz.innerHTML = '<div style="display:flex; flex-wrap:wrap; align-items:center;">' + items + '</div>';
      }

      document.getElementById('btnEnqueue').addEventListener('click', function () {
        var v = inputVal.value.trim();
        if (v === '') return;
        queue.push(v);
        inputVal.value = '';
        render();
      });

      document.getElementById('btnDequeue').addEventListener('click', function () {
        if (queue.length === 0) {
          lastDeq.textContent = '(비어 있음)';
          return;
        }
        var v = queue.shift();
        lastDeq.textContent = v;
        render();
      });

      render();
    })();
  </script>
  <script src="../js/theme.js"></script>
</body>
</html>