看這篇題解
首先要回憶一下握手定理，所以奇數度點一定有偶數個；其次回憶一下樹的必要條件，每個點的度數都大於一的話肯定不是樹；然後再嘗試構造，從特殊圖，樣例等等出發
Circular Spanning Tree
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