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判断有向图是否存在欧拉路每个单词只用第一个和最后一个字符，先用并查集判连通（此时当成无向图即可），若连通，判断是否每个点处入度等于出度，如果均等于或只有两个点处不等且这两个点一个入度比出度大1，一个出度比入度大1，则存在欧拉路，否则不存在 Followed by:
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