{"id":427,"date":"2020-09-26T10:40:22","date_gmt":"2020-09-26T02:40:22","guid":{"rendered":"http:\/\/39.96.58.60\/?p=427"},"modified":"2022-10-18T16:39:23","modified_gmt":"2022-10-18T08:39:23","slug":"leetcode-134-%e5%8a%a0%e6%b2%b9%e7%ab%99","status":"publish","type":"post","link":"http:\/\/www.yatenglg.cn\/blog\/?p=427","title":{"rendered":"Leetcode 134. \u52a0\u6cb9\u7ad9"},"content":{"rendered":"<p>\u5728\u4e00\u6761\u73af\u8def\u4e0a\u6709&nbsp;<em>N<\/em>&nbsp;\u4e2a\u52a0\u6cb9\u7ad9\uff0c\u5176\u4e2d\u7b2c&nbsp;<em>i<\/em>&nbsp;\u4e2a\u52a0\u6cb9\u7ad9\u6709\u6c7d\u6cb9&nbsp;<code>gas[i]<\/code><em>&nbsp;<\/em>\u5347\u3002<\/p>\n<p>\u4f60\u6709\u4e00\u8f86\u6cb9\u7bb1\u5bb9\u91cf\u65e0\u9650\u7684\u7684\u6c7d\u8f66\uff0c\u4ece\u7b2c<em> i <\/em>\u4e2a\u52a0\u6cb9\u7ad9\u5f00\u5f80\u7b2c<em> i+1&nbsp;<\/em>\u4e2a\u52a0\u6cb9\u7ad9\u9700\u8981\u6d88\u8017\u6c7d\u6cb9&nbsp;<code>cost[i]<\/code><em>&nbsp;<\/em>\u5347\u3002\u4f60\u4ece\u5176\u4e2d\u7684\u4e00\u4e2a\u52a0\u6cb9\u7ad9\u51fa\u53d1\uff0c\u5f00\u59cb\u65f6\u6cb9\u7bb1\u4e3a\u7a7a\u3002<\/p>\n<p>\u5982\u679c\u4f60\u53ef\u4ee5\u7ed5\u73af\u8def\u884c\u9a76\u4e00\u5468\uff0c\u5219\u8fd4\u56de\u51fa\u53d1\u65f6\u52a0\u6cb9\u7ad9\u7684\u7f16\u53f7\uff0c\u5426\u5219\u8fd4\u56de -1\u3002<\/p>\n<p><strong>\u8bf4\u660e:<\/strong>&nbsp;<\/p>\n<ul>\n<li>\u5982\u679c\u9898\u76ee\u6709\u89e3\uff0c\u8be5\u7b54\u6848\u5373\u4e3a\u552f\u4e00\u7b54\u6848\u3002<\/li>\n<li>\u8f93\u5165\u6570\u7ec4\u5747\u4e3a\u975e\u7a7a\u6570\u7ec4\uff0c\u4e14\u957f\u5ea6\u76f8\u540c\u3002<\/li>\n<li>\u8f93\u5165\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u5747\u4e3a\u975e\u8d1f\u6570\u3002<\/li>\n<\/ul>\n<p><strong>\u793a\u4f8b&nbsp;1:<\/strong><\/p>\n<pre><strong>\u8f93\u5165:<\/strong> \n\ngas  = [1,2,3,4,5]\n\ncost = [3,4,5,1,2]\n\n\n\n<strong>\u8f93\u51fa:<\/strong> 3\n\n\n\n<strong>\u89e3\u91ca:\n\n<\/strong>\u4ece 3 \u53f7\u52a0\u6cb9\u7ad9(\u7d22\u5f15\u4e3a 3 \u5904)\u51fa\u53d1\uff0c\u53ef\u83b7\u5f97 4 \u5347\u6c7d\u6cb9\u3002\u6b64\u65f6\u6cb9\u7bb1\u6709 = 0 + 4 = 4 \u5347\u6c7d\u6cb9\n\n\u5f00\u5f80 4 \u53f7\u52a0\u6cb9\u7ad9\uff0c\u6b64\u65f6\u6cb9\u7bb1\u6709 4 - 1 + 5 = 8 \u5347\u6c7d\u6cb9\n\n\u5f00\u5f80 0 \u53f7\u52a0\u6cb9\u7ad9\uff0c\u6b64\u65f6\u6cb9\u7bb1\u6709 8 - 2 + 1 = 7 \u5347\u6c7d\u6cb9\n\n\u5f00\u5f80 1 \u53f7\u52a0\u6cb9\u7ad9\uff0c\u6b64\u65f6\u6cb9\u7bb1\u6709 7 - 3 + 2 = 6 \u5347\u6c7d\u6cb9\n\n\u5f00\u5f80 2 \u53f7\u52a0\u6cb9\u7ad9\uff0c\u6b64\u65f6\u6cb9\u7bb1\u6709 6 - 4 + 3 = 5 \u5347\u6c7d\u6cb9\n\n\u5f00\u5f80 3 \u53f7\u52a0\u6cb9\u7ad9\uff0c\u4f60\u9700\u8981\u6d88\u8017 5 \u5347\u6c7d\u6cb9\uff0c\u6b63\u597d\u8db3\u591f\u4f60\u8fd4\u56de\u5230 3 \u53f7\u52a0\u6cb9\u7ad9\u3002\n\n\u56e0\u6b64\uff0c3 \u53ef\u4e3a\u8d77\u59cb\u7d22\u5f15\u3002<\/pre>\n<p><strong>\u793a\u4f8b 2:<\/strong><\/p>\n<pre><strong>\u8f93\u5165:<\/strong> \n\ngas  = [2,3,4]\n\ncost = [3,4,3]\n\n\n\n<strong>\u8f93\u51fa:<\/strong> -1\n\n\n\n<strong>\u89e3\u91ca:\n\n<\/strong>\u4f60\u4e0d\u80fd\u4ece 0 \u53f7\u6216 1 \u53f7\u52a0\u6cb9\u7ad9\u51fa\u53d1\uff0c\u56e0\u4e3a\u6ca1\u6709\u8db3\u591f\u7684\u6c7d\u6cb9\u53ef\u4ee5\u8ba9\u4f60\u884c\u9a76\u5230\u4e0b\u4e00\u4e2a\u52a0\u6cb9\u7ad9\u3002\n\n\u6211\u4eec\u4ece 2 \u53f7\u52a0\u6cb9\u7ad9\u51fa\u53d1\uff0c\u53ef\u4ee5\u83b7\u5f97 4 \u5347\u6c7d\u6cb9\u3002 \u6b64\u65f6\u6cb9\u7bb1\u6709 = 0 + 4 = 4 \u5347\u6c7d\u6cb9\n\n\u5f00\u5f80 0 \u53f7\u52a0\u6cb9\u7ad9\uff0c\u6b64\u65f6\u6cb9\u7bb1\u6709 4 - 3 + 2 = 3 \u5347\u6c7d\u6cb9\n\n\u5f00\u5f80 1 \u53f7\u52a0\u6cb9\u7ad9\uff0c\u6b64\u65f6\u6cb9\u7bb1\u6709 3 - 3 + 3 = 3 \u5347\u6c7d\u6cb9\n\n\u4f60\u65e0\u6cd5\u8fd4\u56de 2 \u53f7\u52a0\u6cb9\u7ad9\uff0c\u56e0\u4e3a\u8fd4\u7a0b\u9700\u8981\u6d88\u8017 4 \u5347\u6c7d\u6cb9\uff0c\u4f46\u662f\u4f60\u7684\u6cb9\u7bb1\u53ea\u6709 3 \u5347\u6c7d\u6cb9\u3002\n\n\u56e0\u6b64\uff0c\u65e0\u8bba\u600e\u6837\uff0c\u4f60\u90fd\u4e0d\u53ef\u80fd\u7ed5\u73af\u8def\u884c\u9a76\u4e00\u5468\u3002<\/pre>\n<p>**\u96be\u5ea6**: Medium<\/p>\n<p>**\u6807\u7b7e**: \u8d2a\u5fc3\u7b97\u6cd5\u3001<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism undefined-numbers lang-python\" data-lang=\"Python\"><code>\n# -*- coding: utf-8 -*-\n# @Author  : LG\n\n\"\"\"\n\u6267\u884c\u7528\u65f6\uff1a40 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8689.07% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a14.6 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e865.02% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u5177\u4f53\u5b9e\u73b0\u89c1\u4ee3\u7801\u6ce8\u91ca\n\"\"\"\nclass Solution:\n    def canCompleteCircuit(self, gas: List[int], cost: List[int]) -&gt; int:\n        surplus = [g-c for g, c in zip(gas, cost)]  # \u8ba1\u7b97\u5f53\u524d\u7ad9\u70b9\u5230\u4e0b\u4e2a\u7ad9\u70b9\u7684\u51c0\u6d88\u8017\n        if sum(surplus) &lt; 0:    # \u5982\u679c \u6574\u4f53\u51c0\u6d88\u8017 &lt; 0, \u5219\u4e0d\u53ef\u80fd\u6210\u73af\n            return -1\n        # \u5f53\u51c0\u6d88\u8017&gt;=0\u65f6\uff0c\u5fc5\u7136\u53ef\u4ee5\u6210\u73af\uff0c\u4f46\u662f\u9700\u8981\u8003\u8651\u4ece\u54ea\u91cc\u4f5c\u4e3a\u5f00\u59cb\n        g = 0\n        start = 0   # \u4ee50\u4e3a\u8d77\u59cb\u70b9\n        for i, sur in enumerate(surplus):\n            g += sur    # \u5f53\u524d\u52a0\u6cb9\u7ad9\u51c0\u6d88\u8017\n            if g &lt; 0:   # \u5982\u679c\u5230\u5f53\u524d\u52a0\u6cb9\u7ad9\u51c0\u6d88\u8017&lt;0\uff0c \u5219[:i]\u90e8\u5206\u7684\u51c0\u6d88\u8017\u548c\u5c0f\u4e8e0\u3002\u524d\u9762\u4e0d\u53ef\u80fd\u6210\u73af\n                g = 0   # \u5c06\u51c0\u6d88\u8017\u5f520, \u4ece\u4e0b\u4e00\u4e2a\u52a0\u6cb9\u7ad9\u5f00\u59cb\u4f5c\u4e3a\u8d77\u59cb\u70b9\n                start = i+1\n        return start<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u4e00\u6761\u73af\u8def\u4e0a\u6709&nbsp;N&nbsp;\u4e2a\u52a0\u6cb9\u7ad9\uff0c\u5176\u4e2d\u7b2c&nbsp;i&nbsp;\u4e2a\u52a0\u6cb9\u7ad9\u6709\u6c7d\u6cb9&nbsp;g&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","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\/427"}],"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=427"}],"version-history":[{"count":1,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/427\/revisions"}],"predecessor-version":[{"id":428,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/427\/revisions\/428"}],"wp:attachment":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=427"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=427"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=427"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}