{"id":1401,"date":"2024-11-08T11:45:27","date_gmt":"2024-11-08T03:45:27","guid":{"rendered":"http:\/\/114.55.108.251\/?p=1401"},"modified":"2025-01-14T11:23:46","modified_gmt":"2025-01-14T03:23:46","slug":"leetcode-hot100%e6%a0%88","status":"publish","type":"post","link":"https:\/\/guapicoding.com\/?p=1401","title":{"rendered":"LeetCode hot100@\u6808"},"content":{"rendered":"\n<p class=\"has-text-align-center wp-block-paragraph\"><em><strong>More content<\/strong><\/em><strong><em>\uff1a<\/em><\/strong><a href=\"https:\/\/guapicoding.com\/?p=1446\" data-type=\"post\" data-id=\"1446\">\u529b\u6263\u9898\u8bb0\u4e4b\u6808<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6808<\/strong>\uff1a<code>stack&lt;int&gt; sk;<\/code><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u961f\u5217<\/strong>\uff1a <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>queue&lt;TreeNode*&gt; q;<\/code> \u5355\u7aef\u961f\u5217<\/li>\n\n\n\n<li><code>deque&lt;char&gt; dq;<\/code> \u53cc\u7aef\u961f\u5217(\u66f4\u5e95\u5c42)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/leetcode.cn\/problems\/valid-parentheses\/\">20. \u6709\u6548\u7684\u62ec\u53f7<\/a>\u2705<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>\u5237\u5305\u6d46\u7684\u9898<\/em><\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Solution {\npublic:\n    bool isValid(string s) {\n        unordered_map&lt;char, char&gt; mp;\n        mp&#91;')'] = '(';\n        mp&#91;']'] = '&#91;';\n        mp&#91;'}'] = '{';\n        stack&lt;char&gt; sk;\n\n        for(const char &amp;c : s) {\n            if(!sk.empty() &amp;&amp; mp&#91;c] == sk.top()) sk.pop();\n            else sk.push(c);\n        }\n\n        return sk.empty();\n    }\n};<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/leetcode.cn\/problems\/min-stack\/\">155. \u6700\u5c0f\u6808<\/a>\u274c<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><em><strong>\u5c1d\u8bd5\u7528\u4e24\u4e2a\u6808\u6216\u8005\u4e00\u6808\u4e00\u5806\u5b9e\u73b0\uff0c\u90fd\u5931\u8d25\u4e86<\/strong><\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>\u4e3b\u8981\u662f\u4e00\u5f00\u59cb\u6ca1\u60f3\u5230<\/em><\/strong><strong><em>\u53e6\u4e00\u4e2a\u8f85\u52a9\u6808\u8981\u5b58\u653e\u7684\u662f\u5bf9\u5e94\u4e3b\u6808\u4e0d\u540c\u65f6\u671f\u7684\u6700\u5c0f\u503c<\/em><\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class MinStack {\nprivate:\n    stack&lt;int&gt; sk;\n    stack&lt;int&gt; mmin_sk; \npublic:\n    MinStack() {\n        mmin_sk.push(INT_MAX); \/\/\u907f\u514d\u5728\u5411\u8f85\u52a9\u6808\u52a0\u5143\u7d20\u65f6\u8fd8\u8981\u5148\u5224\u65ad\u6808\u662f\u5426\u4e3a\u7a7a\n    }\n   \n    void push(int val) {\n        sk.push(val);\n\n        if(val &lt; mmin_sk.top()) mmin_sk.push(val);\n        else mmin_sk.push(mmin_sk.top());\n    }\n    \n    void pop() {\n        sk.pop();\n        mmin_sk.pop();\n    }\n    \n    int top() {\n        return sk.top();\n    }\n    \n    int getMin() {\n        return mmin_sk.top();\n    }\n};<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/leetcode.cn\/problems\/decode-string\/\">394. \u5b57\u7b26\u4e32\u89e3\u7801<\/a>\u274c<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><em><strong>\u5982\u4f55\u5904\u7406\u6570\u5b57\u4e0e\u540e\u7eed\u5b57\u7b26\u4e32\u7684\u5173\u7cfb\uff1f\u4e00\u4e2a\u6808\u591f\u5417\uff1f<\/strong><\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em><strong>\u7531\u91cc\u5411\u5916\u62c6\u89e3\uff1a3[a2[c]]\u21923[acc]\u2192accaccacc <\/strong><\/em><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Solution {\npublic:\n    string decodeString(string s) {\n        stack&lt;int&gt; num_sk;\n        stack&lt;string&gt; str_sk;\n        int num = 0;\n        string res = \"\"; \/\/\u4e0e\u6808\u4ea4\u4e92 \u9010\u6b65\u4e30\u5bcc\u81ea\u5df1\n\n        for(const char &amp;c : s) {\n            if(c &gt;= '0' &amp;&amp; c &lt;= '9') {\n                num = num * 10 + c - '0'; \/\/*10\u9488\u5bf9\u51e0\u4f4d\u5b57\u7b26\u7ec4\u6210\u4e00\u4e2a\u591a\u4f4d\u6570\u5b57\u7684\u60c5\u51b5\n            } else if(c == '&#91;') { \/\/\u628a\u6570\u5b57\u5165\u6808\uff0c\u628a\u4e4b\u524d\u7d2f\u79ef\u7684\u5b57\u7b26\u4e32\u5165\u6808\n                num_sk.push(num);\n                num = 0;\n                str_sk.push(res);\n                res = \"\";\n            } else if(c == ']') { \/\/\u5904\u7406\u4e0e\u4e4b\u76f8\u5bf9\u5e94\u7684&#91;\u4e4b\u95f4\u7684\u90e8\u5206\n                int cnt = num_sk.top();\n                num_sk.pop();\n                while(cnt--) {\n                    str_sk.top() += res;\n                }\n                res = str_sk.top();\n                str_sk.pop();\n            } else if(c &gt;= 'a' &amp;&amp; c &lt;= 'z') {\n                res += c;\n            }\n        }\n\n        return res;\n    }\n};<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">ps\uff1a\u5355\u8c03\u6808\u8bb2\u89e3<a href=\"https:\/\/leetcode.cn\/problems\/daily-temperatures\/solutions\/2811416\/dai-ni-xue-hui-dan-diao-zhan-ji-chu-zhi-eqpen\">https:\/\/leetcode.cn\/problems\/daily-temperatures\/solutions\/2811416\/dai-ni-xue-hui-dan-diao-zhan-ji-chu-zhi-eqpen<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/leetcode.cn\/problems\/daily-temperatures\/\">739. \u6bcf\u65e5\u6e29\u5ea6<\/a>\u274c<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>\u5355\u8c03\u6808\u5e38\u7528\u573a\u666f\uff1a\u5728 O(n) \u7684\u65f6\u95f4\u590d\u6742\u5ea6\u5185\u6c42\u51fa\u6570\u7ec4\u4e2d\u5404\u4e2a\u5143\u7d20\u53f3\u4fa7\u6216\u5de6\u4fa7\u7b2c\u4e00\u4e2a\u66f4\u5927\/\u66f4\u5c0f\u7684\u5143\u7d20\u53ca\u5176\u4e0b\u6807<\/em><\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Solution {\npublic:\n    vector&lt;int&gt; dailyTemperatures(vector&lt;int&gt;&amp; temperatures) {\n        stack&lt;int&gt; sk; \/\/\u4fdd\u6301\u6808\u5185\u5143\u7d20\u975e\u9012\u589e\n        vector&lt;int&gt; res(temperatures.size(), 0); \/\/\u5148\u653e\u5165n\u4e2a0\n\n       \n        for(int i = 0; i &lt; temperatures.size(); i++) {\n            while(!sk.empty() &amp;&amp; temperatures&#91;i] &gt; temperatures&#91;sk.top()]) {\n                res&#91;sk.top()] = i - sk.top();\n                sk.pop();\n            } \n            sk.push(i); \/\/\u6ce8\u610f\u6808\u5b58\u7684\u662f\u4e0b\u6807\n        }\n\n        return res;\n    }\n};<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/leetcode.cn\/problems\/largest-rectangle-in-histogram\/\">84. \u67f1\u72b6\u56fe\u4e2d\u6700\u5927\u7684\u77e9\u5f62<\/a><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>\u8ddf<a href=\"https:\/\/leetcode.cn\/problems\/trapping-rain-water\/\">42. \u63a5\u96e8\u6c34<\/a>\u5f88\u7c7b\u4f3c\uff0c\u6808\u9876\u548c\u6808\u9876\u7684\u4e0b\u4e00\u4e2a\u5143\u7d20\u4ee5\u53ca\u8981\u5165\u6808\u7684\u4e09\u4e2a\u5143\u7d20\u7ec4\u6210\u4e86\u6c42\u6700\u5927\u9762\u79ef\u7684\u9ad8\u548c\u5bbd<\/em><\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Solution {\npublic:\n    int largestRectangleArea(vector&lt;int&gt;&amp; heights) {\n        int res = 0;\n        stack&lt;int&gt; sk; \/\/\u9012\u589e\u5355\u8c03\u6808\n        sk.push(0);\n\n        heights.push_back(0); \/\/\u907f\u514d\u6570\u7ec4\u672c\u8eab\u5b8c\u5168\u9012\u589e\uff0c\u65e0\u6cd5\u89e6\u53d1\u8ba1\u7b97\u6761\u4ef6\n        heights.insert(heights.begin(), 0); \/\/\u907f\u514d\u6570\u7ec4\u672c\u8eab\u5b8c\u5168\u9012\u51cf\uff0c\u53d6\u4e0d\u5230left\n\/\/ &#91;0,2,1,5,6,2,3,0]\n\/\/ i = 5\n\/\/ 0 1      mid = 3\n\/\/ 0 2   \n        for(int i = 1; i &lt; heights.size(); i++) {\n            while(heights&#91;i] &lt; heights&#91;sk.top()]) {\n                int mid = sk.top();\n                sk.pop();\n                int h = heights&#91;mid];  \n                int w = i - sk.top() - 1;  \n                res = max(res, h * w);  \n                \/\/ cout &lt;&lt; \"i = \" &lt;&lt; i &lt;&lt; \", h = \" &lt;&lt; h &lt;&lt; \", w = \" &lt;&lt; w &lt;&lt; \", res = \" &lt;&lt; res &lt;&lt; endl; \n            }\n            sk.push(i);\n        }\n\n        return res;\n    }\n};<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>More content\uff1a\u529b\u6263\u9898\u8bb0\u4e4b\u6808 \u6808\uff1astack&lt;int&gt; sk; \u961f\u5217\uff1a 20. \u6709\u6548\u7684\u62ec [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[27,18,19,52],"class_list":["post-1401","post","type-post","status-publish","format-standard","hentry","category-suanfa","tag-c","tag-leetcode","tag-19","tag-52"],"_links":{"self":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts\/1401","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1401"}],"version-history":[{"count":17,"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts\/1401\/revisions"}],"predecessor-version":[{"id":2324,"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts\/1401\/revisions\/2324"}],"wp:attachment":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1401"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1401"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1401"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}