\u9898\u76ee\u8981\u6c42\uff1a<\/p>\n\n\n\n
\u8003\u8651\u65e0\u5411\u56fe\u4e2d\u6bcf\u6761\u8fb9\u7684\u6743\u91cd\u662f6\uff0c\u6bcf\u4e2a\u8282\u70b9\u7684\u6807\u7b7e\u662f\u7531\u8fde\u7eed\u7684\u4ece1\u5230n\u7684\u6570\u5b57\u7ec4\u6210\u3002<\/p>\n\n\n\n
\u4e00\u4e2a\u5217\u8868\u6e05\u5355\uff0c\u91cc\u9762\u5305\u542b\u4e86\u65e0\u5411\u56fe\u7684\u6240\u6709\u8fb9\u7684\u4fe1\u606f\uff08\u5982:[1,2]\u5c31\u662f1\u548c2\u4e24\u4e2a\u8282\u70b9\u4e4b\u524d\u6709\u4e00\u6761\u8fb9\uff09\uff0c\u8981\u6839\u636e\u7ed9\u51fa\u7684\u8d77\u59cb\u8282\u70b9\u4fe1\u606f\uff0c\u63cf\u8ff0\u51fa\u4ece\u8d77\u59cb\u8282\u70b9\u5230\u5176\u5b83\u6240\u6709\u8282\u70b9\u7684\u8ddd\u79bb\uff08\u6743\u91cd\u4fe1\u606f\uff09\uff0c\u8fd9\u4e2a\u4fe1\u606f\u7531\u5217\u8868\u8fd4\u56de\uff0c\u5e76\u4e14\u8981\u6309\u8282\u70b9\u6807\u7b7e\u7684\u5347\u5e8f\u6392\u5217\uff0c\u4e0d\u5176\u4e2d\u4e0d\u5305\u542b\u8d77\u59cb\u8282\u70b9\uff0c\u5982\u679c\u67d0\u4e2a\u8282\u70b9\u4e0d\u53ef\u8fbe\uff0c\u8be5\u8282\u70b9\u7684\u6743\u91cd\u4e3a-1\uff08\u5982\uff1a\u7ed9\u51fa\u4e00\u5171\u67093\u4e2a\u8282\u70b9\uff0c\u4f46\u662f\u53ea\u6709[1,2]\u4e00\u6761\u8fb9\u7684\u4fe1\u606f\uff0c\u90a3\u4e48\u8282\u70b93\u4e0d\u53ef\u8fbe\uff0c\u8fd4\u56de\u8be5\u8282\u70b9\u4e3a-1\uff09\u3002<\/p>\n\n\n\n
\u8f93\u5165\u7684\u5185\u5bb9\uff1a<\/p>\n\n\n\n
1\u3001q:\u4e3a\u63d0\u95ee\u6b21\u6570\uff08\u5c31\u662f\u8fd9\u4e2a\u7a0b\u5e8f\u8981\u5faa\u73af\u51e0\u6b21\uff0c\u65e0\u6240\u8c13\u7684\u503c\uff09<\/p>\n\n\n\n
2\u3001n\uff1a\u8282\u70b9\u7684\u603b\u6570\uff0cint n<\/p>\n\n\n\n
3\u3001m\uff1a\u8282\u70b9\u8fb9\u7684\u6570\u91cf\uff0cint m<\/p>\n\n\n\n
4\u3001edges\uff1a\u65e0\u5411\u56fe\u8fb9\u7684\u4fe1\u606f\uff0cint edges[m][2]\u8868\u793a\u8fb9\u7684\u8d77\u70b9\u548c\u7ec8\u70b9\uff08\u8fd9\u91cc\u53ef\u80fd\u662f\u6211\u7406\u89e3\u9519\u4e86\uff0c\u65e0\u5411\u56fe\u5e94\u8be5\u662f\u6ca1\u6709\u65b9\u5411\u7684\uff0c\u6240\u4ee5\u65e0\u6240\u8c13\u8d77\u70b9\u548c\u7ec8\u70b9\u3002\uff09<\/p>\n\n\n\n
5\u3001s\uff1a\u8d77\u59cb\u8282\u70b9\u662f\u54ea\u4e2a\uff0cint s<\/p>\n\n\n\n
\u4f8b\u5982\uff1an=5, m=3, edges=[[1,2], [1,3], [3,4]], s=1<\/p>\n\n\n\n
\u6240\u6709\u8282\u70b9\u90fd\u662f\u4ece1\u5f00\u59cb\u8ba1\u7b97\u6743\u91cd\uff0c\u7ecf\u8fc7\u8ba1\u7b97\u540e\uff0c2\u52305\u7684\u6743\u91cd\u4fe1\u606f\u4e3a[6, 6 , 12 ,-1]\u3002<\/p>\n\n\n\n
\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
def bfs(n:int, m:int, edges:list[int], s:int)->list[int]:\n #\u7528\u4e8e\u5b58\u50a8\u6700\u540e\u7684\u7ed3\u679c\n results={i:-1 for i in range(1,n+1)}\n #\u8ba9\u5faa\u73af\u4ece\u201c\u5f00\u59cb\u8282\u70b9\u201d\u5f00\u59cb\n results[s]=0\n for i in range(m):\n for s in [tem[0] for tem in results.items() if tem[1]==(6*i)]:\n # \u628a\u5305\u542b\u5f00\u59cb\u8282\u70b9\u7684\u8fb9\u90fd\u52a0\u5165\u5230\u91cc\u9762\uff0c\u4e5f\u5c31\u662f\u6b63\u5f0f\u5f00\u59cbbfs\u904d\u5386\u8fc7\u7a0b\uff0c\u4ece\u7b2c\u4e00\u5c42\u5f00\u59cb\u9010\u4e2a\u904d\u5386\n next_edges=[edge for edge in edges if s in edge]\n edges = [edge for edge in edges if s not in edge]\n for edge in next_edges:\n #\u5982\u679cedge[0]\u548cS\u8fde\u63a5\uff0c\u5c31\u4ee3\u8868edge[0]\u548cS\u7684\u8ddd\u79bb\u662f6,\u5b57\u5178\u4e2d\u5b83\u7684\u503c\u8bbe\u7f6e\u4e3a6\n if results[edge[1] if s == edge[0] else edge[0]] == -1:\n results[edge[1] if s==edge[0] else edge[0]] = (6*(i+1) )\n if edges==[]:\n break\n #\u8fd4\u56de\u4e0d\u5305\u542b\u5f00\u59cb\u8282\u70b9\u7684\u6240\u6709\u8def\u5f84\u957f\u5ea6\n return [edge for edge in results.values() if edge != 0]\n\n\n# Press the green button in the gutter to run the script.\nif __name__ == '__main__':\n q = int(input().strip())\n\n for q_itr in range(q):\n first_multiple_input = input().rstrip().split()\n\n n = int(first_multiple_input[0])\n\n m = int(first_multiple_input[1])\n\n edges = []\n for _ in range(m):\n edges.append(list(map(int, input().rstrip().split())))\n\n s = int(input().strip())\n result = bfs(n,m,edges,s)\n print(result)\n<\/code><\/pre>\n\n\n\n\u57fa\u7840\u6b3e\u6d4b\u8bd5\u6570\u636e\uff1a<\/p>\n\n\n\n
2 -\u300bq\u7684\u503c
4 2
1 2
1 3
1
3 1
2 3
2<\/p>\n\n\n\n
\u5e94\u8be5\u5f97\u5230\u7684\u8f93\u51fa\u662f\uff1a<\/p>\n\n\n\n
6 6 -1
-1 6<\/p>\n\n\n\n
BFS\u7b97\u6cd5\u6d4b\u8bd5\u6570\u636e<\/a>\u4e0b\u8f7d<\/a><\/div>\n\n\n\n\u8be5\u6d4b\u8bd5\u6570\u6570\u636e\u7b2c\u4e00\u884c\u662fq\u503c\uff0c\u7b2c\u4e8c\u884c\u662fn,m\u503c\uff0c\u6700\u540e\u4e00\u884c\u662f\u7b54\u6848<\/p>\n\n\n\n
BFS\u7b97\u6cd5\u6d4b\u8bd5\u6570\u636e1<\/a>\u8fd9\u91cc\u5305\u542b\u4e86\u4e00\u4e2a\u6587\u4ef6\u5176\u4e2dq=6\u6700\u540e\u6709\u4e2a\u7b54\u6848\u5206\u5272\u7ebf<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"\u9898\u76ee\u8981\u6c42\uff1a \u8003\u8651\u65e0\u5411\u56fe\u4e2d\u6bcf\u6761\u8fb9\u7684\u6743\u91cd\u662f6\uff0c\u6bcf\u4e2a\u8282\u70b9\u7684\u6807\u7b7e\u662f\u7531\u8fde\u7eed\u7684\u4ece1\u5230n\u7684\u6570\u5b57\u7ec4\u6210\u3002 \u4e00\u4e2a\u5217\u8868\u6e05\u5355\uff0c\u91cc\u9762\u5305\u542b\u4e86\u65e0\u5411\u56fe\u7684\u6240\u6709\u8fb9\u7684\u4fe1\u606f\uff08\u5982:[1,2]\u5c31\u662f1\u548c2\u4e24…<\/p>\n