deque.html

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  <title>실습: 덱 | 자료구조</title>
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  <header class="header">
    <h1>실습: 덱 (앞뒤로 넣고 빼기)</h1>
    <p class="subtitle">앞이든 뒤든 넣고 꺼내기 가능</p>
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  <main class="practice-page">
    <a href="../index.html" class="back">← 목차</a>
    <a href="../lectures/02-4-덱.html" class="back">II단원 4. 덱 (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>덱(Deque)</strong> = 앞·뒤 둘 다 넣고 뺄 수 있음. 큐처럼 쓰려면 뒤에 넣고 앞에서만 꺼내면 됨. 파이썬 <code>collections.deque</code>: append, appendleft, pop, popleft. <strong>응용</strong> 최근 본 메뉴 N개, 슬라이딩 윈도우.</p>
    </div>
    <p>덱은 <strong>앞과 뒤 둘 다</strong> 넣고 뺄 수 있어요. 값을 입력한 뒤 <strong>앞에 넣기</strong> 또는 <strong>뒤에 넣기</strong>를 누르고, 꺼낼 때는 <strong>앞에서 꺼내기</strong> / <strong>뒤에서 꺼내기</strong> 중 하나를 골라 보세요.</p>

    <div class="controls">
      <input type="text" id="inputVal" placeholder="넣을 값" maxlength="6" aria-label="덱에 넣을 값">
      <button type="button" id="btnFrontPush">앞에 넣기</button>
      <button type="button" id="btnRearPush">뒤에 넣기</button>
      <br>
      <button type="button" id="btnFrontPop">앞에서 꺼내기</button>
      <button type="button" id="btnRearPop">뒤에서 꺼내기</button>
    </div>

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

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

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

      function addFront() {
        var v = inputVal.value.trim();
        if (v === '') return;
        deque.unshift(v);
        inputVal.value = '';
        render();
      }
      function addRear() {
        var v = inputVal.value.trim();
        if (v === '') return;
        deque.push(v);
        inputVal.value = '';
        render();
      }
      function popFront() {
        if (deque.length === 0) { lastPop.textContent = '(비어 있음)'; return; }
        lastPop.textContent = deque.shift();
        render();
      }
      function popRear() {
        if (deque.length === 0) { lastPop.textContent = '(비어 있음)'; return; }
        lastPop.textContent = deque.pop();
        render();
      }

      document.getElementById('btnFrontPush').addEventListener('click', addFront);
      document.getElementById('btnRearPush').addEventListener('click', addRear);
      document.getElementById('btnFrontPop').addEventListener('click', popFront);
      document.getElementById('btnRearPop').addEventListener('click', popRear);

      render();
    })();
  </script>
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