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应该是:if fast == None or slow == None: 才返回None吧?
而且是返回return fast.next这个才是第一个进环的结点,直接返回fast是前一个结点
我写了测试发现的,楼主看下
3 <main.Node object at 0x000001E414C26080>
4 <main.Node object at 0x000001E414C260B8>
5 <main.Node object at 0x000001E414C26048>
3 <main.Node object at 0x000001E414C26080>
4 <main.Node object at 0x000001E414C260B8>
5 <main.Node object at 0x000001E414C26048>
3 <main.Node object at 0x000001E414C26080>
4 <main.Node object at 0x000001E414C260B8>
结果= <main.Node object at 0x000001E414C26080>
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