{"id":491,"date":"2020-09-26T10:48:06","date_gmt":"2020-09-26T02:48:06","guid":{"rendered":"http:\/\/39.96.58.60\/?p=491"},"modified":"2022-10-18T16:39:03","modified_gmt":"2022-10-18T08:39:03","slug":"leetcode-817-%e9%93%be%e8%a1%a8%e7%bb%84%e4%bb%b6","status":"publish","type":"post","link":"http:\/\/www.yatenglg.cn\/blog\/?p=491","title":{"rendered":"Leetcode 817. \u94fe\u8868\u7ec4\u4ef6"},"content":{"rendered":"

\u7ed9\u5b9a\u94fe\u8868\u5934\u7ed3\u70b9 head<\/code>\uff0c\u8be5\u94fe\u8868\u4e0a\u7684\u6bcf\u4e2a\u7ed3\u70b9\u90fd\u6709\u4e00\u4e2a \u552f\u4e00\u7684\u6574\u578b\u503c<\/strong> \u3002<\/p>\n

\u540c\u65f6\u7ed9\u5b9a\u5217\u8868 G<\/code>\uff0c\u8be5\u5217\u8868\u662f\u4e0a\u8ff0\u94fe\u8868\u4e2d\u6574\u578b\u503c\u7684\u4e00\u4e2a\u5b50\u96c6\u3002<\/p>\n

\u8fd4\u56de\u5217\u8868 G<\/code> \u4e2d\u7ec4\u4ef6\u7684\u4e2a\u6570\uff0c\u8fd9\u91cc\u5bf9\u7ec4\u4ef6\u7684\u5b9a\u4e49\u4e3a\uff1a\u94fe\u8868\u4e2d\u4e00\u6bb5\u6700\u957f\u8fde\u7eed\u7ed3\u70b9\u7684\u503c\uff08\u8be5\u503c\u5fc5\u987b\u5728\u5217\u8868 G<\/code> \u4e2d\uff09\u6784\u6210\u7684\u96c6\u5408\u3002<\/p>\n

 <\/p>\n

\u793a\u4f8b 1\uff1a<\/strong><\/p>\n

\u8f93\u5165:<\/strong> \n\nhead: 0->1->2->3\n\nG = [0, 1, 3]\n\n\u8f93\u51fa:<\/strong> 2\n\n\u89e3\u91ca:<\/strong> \n\n\u94fe\u8868\u4e2d,0 \u548c 1 \u662f\u76f8\u8fde\u63a5\u7684\uff0c\u4e14 G \u4e2d\u4e0d\u5305\u542b 2\uff0c\u6240\u4ee5 [0, 1] \u662f G \u7684\u4e00\u4e2a\u7ec4\u4ef6\uff0c\u540c\u7406 [3] \u4e5f\u662f\u4e00\u4e2a\u7ec4\u4ef6\uff0c\u6545\u8fd4\u56de 2\u3002<\/pre>\n
\u793a\u4f8b 2\uff1a<\/strong><\/p>\n
\u8f93\u5165:<\/strong> \n\nhead: 0->1->2->3->4\n\nG = [0, 3, 1, 4]\n\n\u8f93\u51fa:<\/strong> 2\n\n\u89e3\u91ca:<\/strong> \n\n\u94fe\u8868\u4e2d\uff0c0 \u548c 1 \u662f\u76f8\u8fde\u63a5\u7684\uff0c3 \u548c 4 \u662f\u76f8\u8fde\u63a5\u7684\uff0c\u6240\u4ee5 [0, 1] \u548c [3, 4] \u662f\u4e24\u4e2a\u7ec4\u4ef6\uff0c\u6545\u8fd4\u56de 2\u3002<\/pre>\n
 <\/p>\n
\u63d0\u793a\uff1a<\/strong><\/p>\n
    \n
  • \u5982\u679c N<\/code> \u662f\u7ed9\u5b9a\u94fe\u8868 head<\/code> \u7684\u957f\u5ea6\uff0c1 <= N <= 10000<\/code>\u3002<\/li>\n
  • \u94fe\u8868\u4e2d\u6bcf\u4e2a\u7ed3\u70b9\u7684\u503c\u6240\u5728\u8303\u56f4\u4e3a [0, N - 1]<\/code>\u3002<\/li>\n
  • 1 <= G.length <= 10000<\/code><\/li>\n
  • G<\/code> \u662f\u94fe\u8868\u4e2d\u6240\u6709\u7ed3\u70b9\u7684\u503c\u7684\u4e00\u4e2a\u5b50\u96c6.<\/li>\n<\/ul>\n
    **\u96be\u5ea6**: Medium<\/p>\n
    **\u6807\u7b7e**: \u94fe\u8868\u3001<\/p>\n
    \n
    \n# -*- coding: utf-8 -*-\n# @Author  : LG\n\n\n\"\"\"\n\u6267\u884c\u7528\u65f6\uff1a100 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e86100.00% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a18 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e865.27% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u904d\u5386\u94fe\u8868\uff0c\u67e5\u770b\u662f\u5426\u5b58\u5728\u4e0eG\u4e2d\uff0c\u5982\u5b58\u5728\uff0c\u5c31\u7b97\u4e00\u4e2a\u7ec4\u4ef6\uff0c\u76f4\u5230\u4e0b\u6b21\u51fa\u73b0\u65ad\u5f00\u7684\u60c5\u51b5\n    \u6dfb\u52a0\u4e86G = set(G)\n\"\"\"\nclass Solution:\n    def numComponents(self, head: ListNode, G: List[int]) -> int:\n        G = set(G)\n        num = 0\n        start = False   # \u7528\u4e8e\u8bb0\u5f55\u662f\u5426\u8fde\u7eed\n        while head:\n            if head.val in G:\n                G.remove(head.val)\n                if not start:   # \u4e0e\u524d\u9762\u4e0d\u8fde\u7eed\uff0c\u5219\u4e3a\u4e00\u4e2a\u65b0\u79df\u4ef6\n                    start = True\n                    num += 1\n            else:   # \u5f53\u524d\u503c\u4e0d\u5728G\u4e2d\uff0c\u65ad\u5f00\n                start = False\n            head = head.next\n        return num<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
    \u7ed9\u5b9a\u94fe\u8868\u5934\u7ed3\u70b9 head\uff0c\u8be5\u94fe\u8868\u4e0a\u7684\u6bcf\u4e2a\u7ed3\u70b9\u90fd\u6709\u4e00\u4e2a \u552f\u4e00\u7684\u6574\u578b\u503c \u3002 \u540c\u65f6\u7ed9\u5b9a\u5217\u8868 G\uff0c…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":[],"categories":[11,1],"tags":[],"_links":{"self":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/491"}],"collection":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=491"}],"version-history":[{"count":1,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/491\/revisions"}],"predecessor-version":[{"id":492,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/491\/revisions\/492"}],"wp:attachment":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=491"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=491"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=491"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}