{"id":737,"date":"2020-09-26T11:16:10","date_gmt":"2020-09-26T03:16:10","guid":{"rendered":"http:\/\/39.96.58.60\/?p=737"},"modified":"2022-10-18T16:37:28","modified_gmt":"2022-10-18T08:37:28","slug":"leetcode-376-%e6%91%86%e5%8a%a8%e5%ba%8f%e5%88%97","status":"publish","type":"post","link":"http:\/\/www.yatenglg.cn\/blog\/?p=737","title":{"rendered":"Leetcode 376. \u6446\u52a8\u5e8f\u5217"},"content":{"rendered":"<p>\u5982\u679c\u8fde\u7eed\u6570\u5b57\u4e4b\u95f4\u7684\u5dee\u4e25\u683c\u5730\u5728\u6b63\u6570\u548c\u8d1f\u6570\u4e4b\u95f4\u4ea4\u66ff\uff0c\u5219\u6570\u5b57\u5e8f\u5217\u79f0\u4e3a<strong>\u6446\u52a8\u5e8f\u5217\u3002<\/strong>\u7b2c\u4e00\u4e2a\u5dee\uff08\u5982\u679c\u5b58\u5728\u7684\u8bdd\uff09\u53ef\u80fd\u662f\u6b63\u6570\u6216\u8d1f\u6570\u3002\u5c11\u4e8e\u4e24\u4e2a\u5143\u7d20\u7684\u5e8f\u5217\u4e5f\u662f\u6446\u52a8\u5e8f\u5217\u3002<\/p>\n<p>\u4f8b\u5982\uff0c&nbsp;<code>[1,7,4,9,2,5]<\/code> \u662f\u4e00\u4e2a\u6446\u52a8\u5e8f\u5217\uff0c\u56e0\u4e3a\u5dee\u503c <code>(6,-3,5,-7,3)<\/code>&nbsp;\u662f\u6b63\u8d1f\u4ea4\u66ff\u51fa\u73b0\u7684\u3002\u76f8\u53cd, <code>[1,4,7,2,5]<\/code>&nbsp;\u548c&nbsp;<code>[1,7,4,5,5]<\/code> \u4e0d\u662f\u6446\u52a8\u5e8f\u5217\uff0c\u7b2c\u4e00\u4e2a\u5e8f\u5217\u662f\u56e0\u4e3a\u5b83\u7684\u524d\u4e24\u4e2a\u5dee\u503c\u90fd\u662f\u6b63\u6570\uff0c\u7b2c\u4e8c\u4e2a\u5e8f\u5217\u662f\u56e0\u4e3a\u5b83\u7684\u6700\u540e\u4e00\u4e2a\u5dee\u503c\u4e3a\u96f6\u3002<\/p>\n<p>\u7ed9\u5b9a\u4e00\u4e2a\u6574\u6570\u5e8f\u5217\uff0c\u8fd4\u56de\u4f5c\u4e3a\u6446\u52a8\u5e8f\u5217\u7684\u6700\u957f\u5b50\u5e8f\u5217\u7684\u957f\u5ea6\u3002 \u901a\u8fc7\u4ece\u539f\u59cb\u5e8f\u5217\u4e2d\u5220\u9664\u4e00\u4e9b\uff08\u4e5f\u53ef\u4ee5\u4e0d\u5220\u9664\uff09\u5143\u7d20\u6765\u83b7\u5f97\u5b50\u5e8f\u5217\uff0c\u5269\u4e0b\u7684\u5143\u7d20\u4fdd\u6301\u5176\u539f\u59cb\u987a\u5e8f\u3002<\/p>\n<p><strong>\u793a\u4f8b 1:<\/strong><\/p>\n<pre><strong>\u8f93\u5165: <\/strong>[1,7,4,9,2,5]\n\n<strong>\u8f93\u51fa: <\/strong>6 \n\n<strong>\u89e3\u91ca: <\/strong>\u6574\u4e2a\u5e8f\u5217\u5747\u4e3a\u6446\u52a8\u5e8f\u5217\u3002\n\n<\/pre>\n<p><strong>\u793a\u4f8b 2:<\/strong><\/p>\n<pre><strong>\u8f93\u5165: <\/strong>[1,17,5,10,13,15,10,5,16,8]\n\n<strong>\u8f93\u51fa: <\/strong>7\n\n<strong>\u89e3\u91ca: <\/strong>\u8fd9\u4e2a\u5e8f\u5217\u5305\u542b\u51e0\u4e2a\u957f\u5ea6\u4e3a 7 \u6446\u52a8\u5e8f\u5217\uff0c\u5176\u4e2d\u4e00\u4e2a\u53ef\u4e3a[1,17,10,13,10,16,8]\u3002<\/pre>\n<p><strong>\u793a\u4f8b 3:<\/strong><\/p>\n<pre><strong>\u8f93\u5165: <\/strong>[1,2,3,4,5,6,7,8,9]\n\n<strong>\u8f93\u51fa: <\/strong>2<\/pre>\n<p><strong>\u8fdb\u9636:<\/strong><\/p>\n<p>\u4f60\u80fd\u5426\u7528&nbsp;O(<em>n<\/em>) \u65f6\u95f4\u590d\u6742\u5ea6\u5b8c\u6210\u6b64\u9898?<\/p>\n<p>**\u96be\u5ea6**: Medium<\/p>\n<p>**\u6807\u7b7e**: \u8d2a\u5fc3\u7b97\u6cd5\u3001 \u52a8\u6001\u89c4\u5212\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\u4e8690.60% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a13.7 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8668.93% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u52a8\u6001\u89c4\u5212\n    \u4f8b\uff1a  1,17,5,10,13,15,10,5,16,8\n\n            1     17    5    10     13    15    10    5     16    8\n        \u2197   0   \u2197 1 \u2198 \u2192 1   \u2197 3   \u2197 3   \u2197 3 \u2198 \u2192 3 \u2198 \u2192 3   \u2197 5 \u2198 \u2192 5\n        \u2198   0 \u2197 \u2192 0   \u2198 2 \u2197 \u2192 2 \u2197 \u2192 2 \u2197 \u2192 2   \u2198 4   \u2198 4 \u2197 \u2192 4   \u2198 6\n\n        n   1     2     3     4     4     4     5     5     6     7\n\n        \u4f7f\u7528dp[0][i]\u4fdd\u5b58\u4e0a\u5347\u7684\u7ed3\u679c\uff0c\u4f7f\u7528dp[1][i]\u8868\u793a\u4e0b\u964d\u7684\u7ed3\u679c\n        nums[i] &gt; nums[i+1]\u65f6\uff0c\u4e0a\u5347\n            dp[0][i] = dp[1][i-1] + 1   \u5f53\u524d\u6570\u503c\u5728\u4e0a\u4e00\u4e2a\u4e0b\u964d\u65f6\u7684\u6570\u503c\u57fa\u7840\u4e0a+1\n            dp[1][i] = dp[1][i-1]       \u5f53\u524d\u6570\u5b57\u4e0b\u964d\u7b49\u4e8e\u524d\u4e00\u4e2a\u4e0b\u964d\u65f6\u7684\u6570\u503c\uff0c\u4fdd\u6301\u4e0d\u53d8\n        nums[i] &lt; nums[i+1]\u65f6\uff0c\u4e0b\u964d\n            dp[0][i] = dp[0][i-1]       \u5f53\u524d\u6570\u503c\u4e0a\u5347\u7b49\u4e8e\u524d\u4e00\u4e2a\u6570\u4e0a\u5347\u65f6\u7684\u6570\u503c\uff0c\u4fdd\u6301\u4e0d\u53d8\n            dp[1][i] = dp[0][i-1] + 1   \u5f53\u524d\u6570\u5b57\u4e0b\u964d\u5728\u524d\u4e00\u4e2a\u6570\u4e0a\u5347\u7684\u6570\u503c\u57fa\u7840\u4e0a+1\n        nums[i] == nums[i+1]\u65f6\uff0c\u7b49\u4e8e\n            dp[0][i] = dp[0][i - 1]     \u4e0a\u5347\u4e0b\u964d\u5747\u4fdd\u6301\u4e0d\u53d8\n            dp[1][i] = dp[1][i - 1]\n\n\"\"\"\nclass Solution:\n    def wiggleMaxLength(self, nums: List[int]) -&gt; int:\n        n = len(nums)\n        if n == 0:\n            return 0\n        dp = [[0 for _ in range(n)] for _ in range(2)]\n        for i in range(1,n):\n            if nums[i] &gt; nums[i-1]:\n                dp[1][i] = dp[1][i - 1]\n                dp[0][i] = dp[1][i - 1] + 1\n            elif nums[i] &lt; nums[i-1]:\n                dp[1][i] = dp[0][i - 1] + 1\n                dp[0][i] = dp[0][i - 1]\n            else:\n                dp[0][i] = dp[0][i - 1]\n                dp[1][i] = dp[1][i - 1]\n        return max(dp[0][-1], dp[1][-1])+1<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u679c\u8fde\u7eed\u6570\u5b57\u4e4b\u95f4\u7684\u5dee\u4e25\u683c\u5730\u5728\u6b63\u6570\u548c\u8d1f\u6570\u4e4b\u95f4\u4ea4\u66ff\uff0c\u5219\u6570\u5b57\u5e8f\u5217\u79f0\u4e3a\u6446\u52a8\u5e8f\u5217\u3002\u7b2c\u4e00\u4e2a\u5dee\uff08\u5982\u679c\u5b58\u5728\u7684\u8bdd\uff09\u53ef\u80fd\u662f\u6b63\u6570\u6216\u8d1f&#8230;<\/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\/737"}],"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=737"}],"version-history":[{"count":1,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/737\/revisions"}],"predecessor-version":[{"id":738,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/737\/revisions\/738"}],"wp:attachment":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=737"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=737"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=737"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}