lessons/课程/插图/09-基环树/00-基环树-02-剥叶.svg

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 820 300" role="img" aria-labelledby="title desc">
  <title id="title">基环树剥叶过程</title><desc id="desc">叶子 E F G 被剥离后，D 成为叶子，最后只余 A B C 环。</desc>
  <style>text{font-family:system-ui,sans-serif;fill:#172033}.edge{stroke:#94a3b8;stroke-width:4}.cycle{stroke:#2563eb;stroke-width:6;fill:none}.leaf{fill:#fee2e2;stroke:#dc2626;stroke-width:4}.core{fill:#dbeafe;stroke:#2563eb;stroke-width:4}.note{font-size:18px}.label{font-size:22px;font-weight:700}</style>
  <text x="24" y="30" class="note">先删红色叶子；它们消失后 D 也会变叶子，蓝色三角形最后留下。</text><path class="cycle" d="M240 165 L380 70 L505 190 Z"/><line class="edge" x1="380" y1="70" x2="380" y2="190"/><line class="edge" x1="380" y1="190" x2="380" y2="250"/><line class="edge" x1="505" y1="190" x2="650" y2="235"/><line class="edge" x1="505" y1="190" x2="660" y2="110"/><circle class="core" cx="240" cy="165" r="25"/><circle class="core" cx="380" cy="70" r="25"/><circle class="core" cx="505" cy="190" r="25"/><circle class="leaf" cx="380" cy="190" r="25"/><circle class="leaf" cx="380" cy="250" r="25"/><circle class="leaf" cx="650" cy="235" r="25"/><circle class="leaf" cx="660" cy="110" r="25"/><text class="label" x="231" y="174">A</text><text class="label" x="371" y="79">B</text><text class="label" x="496" y="199">C</text><text class="label" x="371" y="199">D</text><text class="label" x="371" y="259">E</text><text class="label" x="641" y="244">F</text><text class="label" x="651" y="119">G</text><text x="82" y="280" class="note">队列顺序可为 E,F,G,D；剩余 A,B,C。</text>
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