{"id":360,"date":"2025-07-02T15:30:44","date_gmt":"2025-07-02T07:30:44","guid":{"rendered":"http:\/\/getzs.online\/?p=360"},"modified":"2025-07-02T15:30:44","modified_gmt":"2025-07-02T07:30:44","slug":"42-%e6%8e%a5%e9%9b%a8%e6%b0%b4","status":"publish","type":"post","link":"https:\/\/hello.getzs.online\/index.php\/2025\/07\/02\/42-%e6%8e%a5%e9%9b%a8%e6%b0%b4\/","title":{"rendered":"42. \u63a5\u96e8\u6c34"},"content":{"rendered":"\n<p><a href=\"https:\/\/leetcode.cn\/problems\/trapping-rain-water\/\">42. \u63a5\u96e8\u6c34<\/a><\/p>\n\n\n\n<p>\u7ed9\u5b9a&nbsp;<code>n<\/code>&nbsp;\u4e2a\u975e\u8d1f\u6574\u6570\u8868\u793a\u6bcf\u4e2a\u5bbd\u5ea6\u4e3a&nbsp;<code>1<\/code>&nbsp;\u7684\u67f1\u5b50\u7684\u9ad8\u5ea6\u56fe\uff0c\u8ba1\u7b97\u6309\u6b64\u6392\u5217\u7684\u67f1\u5b50\uff0c\u4e0b\u96e8\u4e4b\u540e\u80fd\u63a5\u591a\u5c11\u96e8\u6c34\u3002<\/p>\n\n\n\n<p><strong>\u793a\u4f8b 1\uff1a<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/assets.leetcode-cn.com\/aliyun-lc-upload\/uploads\/2018\/10\/22\/rainwatertrap.png\" alt=\"\"\/><\/figure>\n\n\n\n<pre class=\"wp-block-preformatted\"><strong>\u8f93\u5165\uff1a<\/strong>height = [0,1,0,2,1,0,1,3,2,1,2,1]\n<strong>\u8f93\u51fa\uff1a<\/strong>6\n<strong>\u89e3\u91ca\uff1a<\/strong>\u4e0a\u9762\u662f\u7531\u6570\u7ec4 [0,1,0,2,1,0,1,3,2,1,2,1] \u8868\u793a\u7684\u9ad8\u5ea6\u56fe\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u63a5 6 \u4e2a\u5355\u4f4d\u7684\u96e8\u6c34\uff08\u84dd\u8272\u90e8\u5206\u8868\u793a\u96e8\u6c34\uff09\u3002 \n<\/pre>\n\n\n\n<p><strong>\u793a\u4f8b 2\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><strong>\u8f93\u5165\uff1a<\/strong>height = [4,2,0,3,2,5]\n<strong>\u8f93\u51fa\uff1a<\/strong>9\n<\/pre>\n\n\n\n<p><strong>\u63d0\u793a\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>n == height.length<\/code><\/li>\n\n\n\n<li><code>1 &lt;= n &lt;= 2 * 10<sup>4<\/sup><\/code><\/li>\n\n\n\n<li><code>0 &lt;= height[i] &lt;= 10<sup>5<\/sup><\/code><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public int trap(int&#91;] height) {\n        return method1(height, height.length);\n    }\n\n    \/**\n     * \u8d2a\u5fc3 + \u53cc\u6307\u9488\n     * 1 ms\n     * \u590d\u6742\u5ea6O(n)\n     *\/\n    public int method1(int&#91;] height, int n) {\n        int i = 0, j = n - 1;\n        int leftMax = 0, rightMax = 0;\n        int sum = 0;\n        while (i &lt; j) {\n            \/\/ \u83b7\u53d6\u5de6\u53f3\u8fb9\u754c\u7684\u6700\u9ad8\u503c\n            leftMax = Math.max(leftMax, height&#91;i]);\n            rightMax = Math.max(rightMax, height&#91;j]);\n            \/\/ \u5c0f\u7684\u90a3\u4e2a\u9700\u8981\u79fb\u52a8\uff0c\u56e0\u4e3a\u77ed\u6876\u6548\u5e94\uff0c\u9700\u8981\u627e\u5230\u957f\u7684\u6876\n            sum += leftMax &lt; rightMax ? leftMax - height&#91;i++] : rightMax - height&#91;j--];\n        }\n        return sum;\n    }<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>42. \u63a5\u96e8\u6c34 \u7ed9\u5b9a&nbsp;n&nbsp;\u4e2a\u975e\u8d1f\u6574\u6570\u8868\u793a\u6bcf\u4e2a\u5bbd\u5ea6\u4e3a&nbsp;1&nbsp;\u7684\u67f1\u5b50\u7684\u9ad8\u5ea6\u56fe [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,11],"tags":[],"class_list":["post-360","post","type-post","status-publish","format-standard","hentry","category-leetcode"],"_links":{"self":[{"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/posts\/360","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/comments?post=360"}],"version-history":[{"count":1,"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/posts\/360\/revisions"}],"predecessor-version":[{"id":361,"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/posts\/360\/revisions\/361"}],"wp:attachment":[{"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/media?parent=360"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/categories?post=360"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hello.getzs.online\/index.php\/wp-json\/wp\/v2\/tags?post=360"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}