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\u7b97\u6cd5\u7ec3\u4e60 Leetcode \u529b\u6263 269. Alien Dictionary \u89e3\u6cd5<\/a><\/blockquote><\/iframe><script type=\"text\/javascript\">\n\/*! 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sort\uff0c\u9700\u8981\u5224\u65ad\u6709\u6ca1\u6709\u73af\u6765\u5904\u7406\u65e0\u6548input\uff0c\u96be\u5ea6\u4e3b\u8981\u6765\u81ea\u8fd9\u90e8\u5206\u3002Topological sort\u53ef\u4ee5\u7528dfs\u89e3\u51b3\uff0c\u4f46\u662f\u6ca1\u7ec3\u4e60\u8fc7\u8fd8\u4e0d\u4e0d\u5bb9\u6613\u5199\u5bf9\u7684\u3002\u5148\u4e0a\u4e00\u4e2a\u6211\u6bd4\u8f83\u6ee1\u610f\u7684python\u89e3\u6cd5\u3002 \u603b\u7ed3\u4e00\u4e0b\u8981\u70b9\u30021. edges = {c: [] for word in words for c in word} \u8fd9\u79cd\u4e00\u884c\u4e24\u4e2a\u5faa\u73af\u5efamap\u7684\u65b9\u5f0f\u6211\u4e5f\u662f\u65b0\u5b66\u7684\uff0c\u5f88\u65b9\u4fbf\u3002\u8fd9\u4e2amap key\u662f\u6392\u524d\u9762\u7684\u5b57\u6bcd\uff0cvalue\u662f\u6392\u540e\u9762\u7684\u5b57\u6bcd\u3002\u800c\u4e14\u4e0d\u7ba1\u6709\u6ca1\u6709\u540e\u9762\u7684\uff0ckey\u90fd\u52a0\u4e0a\u4e86\uff0c\u8fd9\u6837\u7701\u4e86\u53e6\u4e00\u4e2a\u53d8\u91cf\u5b58\u5b57\u6bcd\u8868\uff0c\u53ef\u4ee5\u5bf9\u6bd4\u6211\u4e4b\u524d\u4e00\u4e2a\u5199\u5bf9\u4e0d\u90a3\u4e48\u597d\u7684\u89e3\u6cd5\u30022. \u7528zip\u904d\u5386pair\u5f88\u597d\u7528\uff0c\u51cf\u5c11\u4e86\u51faindex bug\u7684\u53ef\u80fd3. len(word1) > len(word2) and word1.startswith(word2)\uff0c\u8fd9\u662f\u4e00\u4e2a\u7279\u6b8a\u7684case\u3002\u6bd4\u5982abc\u6392\u5728ab\u524d\u9762\uff0c\u4e0d\u7ba1\u4ec0\u4e48\u5b57\u6bcd\u8868\u987a\u5e8f\uff0c\u5c31\u662fc\u6392\u5728\u7a7a\u524d\u9762\uff0c\u90a3\u662f\u65e0\u6548\u7684\u30024. seen\u7684\u5229\u7528\uff0c\u8fd9\u662f\u6700\u5de7\u5999\u7684\u5730\u65b9\u3002\u5199\u4e86\u51e0\u79cd\u5c1d\u8bd5\uff0c\u53d1\u73b0\u73af\u4e0d\u592a\u5bb9\u6613\u3002\u5982\u679c\u53ea\u7528\u4e00\u4e2aset\u8bb0\u5f55visited\uff0c\u5c31\u65e0\u6cd5\u533a\u5206\u662f\u4e00\u6761\u5df2\u7ecf\u8d70\u901a\u7684\u8def\u8fd8\u662f\u5f53\u524d\u8fd9\u6761\u8def\u53c8\u56de\u5230\u67d0\u4e2a\u4e4b\u524d\u7ecf\u8fc7\u7684\u4e00\u70b9\u3002\u89e3\u6cd5\u65b9\u6cd5\u53ef\u4ee5\u7528\u4e00\u4e2aset\u8bb0\u5f55visited\uff0c\u53ea\u52a0\u4e0d\u51cf\uff0c\u53e6\u4e00\u4e2aset\u8bb0\u5f55\u5f53\u524d\u8fd9\u6761\u8def\u7684\u8def\u5f84\uff0c\u56de\u6eaf\u65f6\u8981\u66f4\u65b0\uff0c\u6bd4\u8f83\u9ebb\u70e6\u3002\u8fd9\u79cd\u89e3\u6cd5\u5229\u7528\u4e86False\u548cTrue\u4e24\u79cdstates\uff0cFalse\u4ee3\u8868\u6b63\u5728\u8d70\u7684\u8def\uff0cTrue\u4ee3\u8868\u4ee5\u524d\u5df2\u7ecf\u8d70\u5230\u5e95\u80fd\u8d70\u901a\u7684\u8def\u3002\u975e\u5e38\u6df1\u523b\uff0c\u6211\u60f3\u4e86\u5f88\u4e45\u624d\u7b97\u5927\u6982\u7406\u89e3\u30025. if not all(dfs(start) for start in edges)\uff0call\u662f\u4e2a\u6211\u65b0\u5b66\u7684function\uff0cinput\u662fcollection\u6216\u8005\u66f4\u51c6\u786e\u8bf4\u662f\u53ef\u4ee5iterable\u7684\u4e1c\u897f\uff0c\u5c31\u662f\u8981\u6bcf\u4e2a\u5143\u7d20\u90fd\u662ftrue\u5c31\u662ftrue\u3002\u6362\u53e5\u8bdd\u8bf4\u5c31\u50cf\u5f00\u5173\u4e32\u8054\u3002\u672c\u6765\u6211\u5199\u5f97\u662fall([dfs(start) for start in edges])\uff0c\u540e\u6765\u53d1\u73b0\u4ee3\u8868list\u7684\u65b9\u62ec\u53f7\u53ef\u4ee5\u7701\u7565\uff0c\u4f30\u8ba1\u662f\u4e9b\u8bed\u6cd5\u7cd6\u3002Python\u91cc\u9762\u786e\u5b9e\u6709\u5f88\u591a\u6211\u4e0d\u77e5\u9053\u7684\u8bed\u6cd5\u7cd6\u30026. dfs\u662f\u51fd\u6570\u5185\u5b9a\u4e49\u7684\u51fd\u6570\uff0c\u53ef\u4ee5\u7701\u4e86self\u548c\u7528\u5185\u51fd\u6570\u5916\u7684\u53d8\u91cf\u4fdd\u5b58\u72b6\u6001\uff0c\u4e0d\u7528\u6bcf\u4e2arecursion call\u90fdpass\u4e00\u6b21\u3002 \u505a\u5b8c\u8fd9\u9898\u540e\uff0c\u91cd\u65b0\u505acourse...Read more"}