{"id":660,"date":"2024-10-08T19:27:21","date_gmt":"2024-10-08T11:27:21","guid":{"rendered":"http:\/\/114.55.108.251\/?p=660"},"modified":"2025-03-14T11:19:31","modified_gmt":"2025-03-14T03:19:31","slug":"leetcode-hot100%e6%bb%91%e5%8a%a8%e7%aa%97%e5%8f%a3","status":"publish","type":"post","link":"https:\/\/guapicoding.com\/?p=660","title":{"rendered":"LeetCode hot100@\u6ed1\u52a8\u7a97\u53e3&amp;\u5b50\u4e32"},"content":{"rendered":"\n<p><strong>\u6ed1\u52a8\u7a97\u53e3\u5927\u81f4\u903b\u8f91\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int left = 0, right = 0;\n\nwhile (right &lt; s.size()) {\n    \/\/ \u589e\u5927\u7a97\u53e3\n    window.add(s&#91;right]);\n    right++;\n    \n    while (window needs shrink) {\n        \/\/ \u7f29\u5c0f\u7a97\u53e3\n        window.remove(s&#91;left]);\n        left++;\n    }\n}<\/code><\/pre>\n\n\n\n<p><strong>\u6ed1\u52a8\u7a97\u53e3\u7b97\u6cd5\u6846\u67b6\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code><code>void slidingWindow(string s, string t) {\n    unordered_map&lt;char, int&gt; need, window;\n    for (const char &amp;c : t) need&#91;c]++;\n \n    int left = 0, right = 0;\n    int valid = 0; \n    while (right &lt; s.size()) {\n        \/\/ c \u662f\u5c06\u79fb\u5165\u7a97\u53e3\u7684\u5b57\u7b26\n        char c = s&#91;right];\n        \/\/ \u53f3\u79fb\u7a97\u53e3\n        right++;\n        \/\/ \u8fdb\u884c\u7a97\u53e3\u5185\u6570\u636e\u7684\u4e00\u7cfb\u5217\u66f4\u65b0\n        ...\n<\/code>\n<code>        \/*** debug \u8f93\u51fa\u7684\u4f4d\u7f6e ***\/\n        printf(\"window: &#91;%d, %d)\\n\", left, right);\n        \/********************\/\n \n        \/\/ \u5224\u65ad\u5de6\u4fa7\u7a97\u53e3\u662f\u5426\u8981\u6536\u7f29\n        while (window needs shrink) {\n            \/\/ d \u662f\u5c06\u79fb\u51fa\u7a97\u53e3\u7684\u5b57\u7b26\n            char d = s&#91;left];\n            \/\/ \u5de6\u79fb\u7a97\u53e3\n            left++;\n            \/\/ \u8fdb\u884c\u7a97\u53e3\u5185\u6570\u636e\u7684\u4e00\u7cfb\u5217\u66f4\u65b0\n            ...\n        }\n    }\n}<\/code><\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>\u5957\u6a21\u677f\u65f6\u8003\u8651\u4ee5\u4e0b\u56db\u4e2a\u95ee\u9898\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5f53\u79fb\u52a8 <code>right<\/code> \u6269\u5927\u7a97\u53e3\uff0c\u5373\u52a0\u5165\u5b57\u7b26\u65f6\uff0c\u5e94\u8be5\u66f4\u65b0\u54ea\u4e9b\u6570\u636e\uff1f<\/li>\n\n\n\n<li>\u4ec0\u4e48\u6761\u4ef6\u4e0b\uff0c\u7a97\u53e3\u5e94\u8be5\u6682\u505c\u6269\u5927\uff0c\u5f00\u59cb\u79fb\u52a8 <code>left<\/code> \u7f29\u5c0f\u7a97\u53e3\uff1f<\/li>\n\n\n\n<li>\u5f53\u79fb\u52a8 <code>left<\/code> \u7f29\u5c0f\u7a97\u53e3\uff0c\u5373\u79fb\u51fa\u5b57\u7b26\u65f6\uff0c\u5e94\u8be5\u66f4\u65b0\u54ea\u4e9b\u6570\u636e\uff1f<\/li>\n\n\n\n<li>\u6211\u4eec\u8981\u7684\u7ed3\u679c\u5e94\u8be5\u5728\u6269\u5927\u7a97\u53e3\u65f6\u8fd8\u662f\u7f29\u5c0f\u7a97\u53e3\u65f6\u8fdb\u884c\u66f4\u65b0\uff1f<\/li>\n<\/ul>\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\/longest-substring-without-repeating-characters\/\">3. \u65e0\u91cd\u590d\u5b57\u7b26\u7684\u6700\u957f\u5b50\u4e32<\/a>\u2705<\/h2>\n\n\n\n<p><strong><em>\u66b4\u529b\uff1a\u7528map\u7ef4\u62a4\u7a97\u53e3\u5185\u7684\u5b57\u7b26\u4e0d\u91cd\u590d<\/em>\uff0c\u6bcf\u6b21\u91cd\u65b0\u8ba1\u6570\u53ea\u8ba9\u5de6\u8fb9\u754c+1<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Solution {\npublic:\n    int lengthOfLongestSubstring(string s) {\n        if(!s.size()) return 0;\n\n        unordered_map&lt;char, int&gt; mp;\n        int left = 0, right = 1;\n        int res = 1;\n\n        mp&#91;s&#91;0]] = 1;\n        while(left &lt; right &amp;&amp; right &lt; s.size()) {\n            if(mp&#91;s&#91;right]] != 1) {\n                mp&#91;s&#91;right]] = 1;\n                res = max(res, right - left + 1);\n                right++; \n                \/\/ printf(\"res = %d right = %d left = %d\\n\", res, right, left);\n            } else {\n                left++;\n                mp.clear();\n                mp&#91;s&#91;left]] = 1;\n                right = left + 1;\n            }\n            \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\/find-all-anagrams-in-a-string\/\">438. \u627e\u5230\u5b57\u7b26\u4e32\u4e2d\u6240\u6709\u5b57\u6bcd\u5f02\u4f4d\u8bcd<\/a>\u274c<\/h2>\n\n\n\n<p><s><strong><em>\u7528substr\u9010\u6b65\u6784\u9020\u5b50\u4e32\u4e0ep\u6bd4\u8f83\uff0c\u8d85\u65f6<\/em><\/strong><\/s><\/p>\n\n\n\n<p><strong><em>\u6ed1\u52a8\u7a97\u53e3<\/em><\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Solution {\npublic:\n    vector&lt;int&gt; findAnagrams(string s, string p) {\n        vector&lt;int&gt; res;\n        unordered_map&lt;char, int&gt; need, window;\n        for(const auto &amp;c : p) {\n            need&#91;c]++;\n        }\n        \n        int left = 0, right = 0;\n        int vaild = 0;\n        while(right &lt; s.size()) {\n            \/\/\u53f3\u7a97\u53e3\u66f4\u65b0\n            char rc = s&#91;right++];\n            if(need.count(rc)) {\n                window&#91;rc]++;\n                if(need&#91;rc] == window&#91;rc]) vaild++;\n            }\n       \n            \/\/\u5224\u65ad\u5de6\u7a97\u53e3\u66f4\u65b0\n            while(right - left &gt;= p.size()) {\n                if(vaild == need.size()) { \/\/\u6ce8\u610f\u662fneed\u7684\u957f\u5ea6\u800c\u4e0d\u662fp\n                    res.push_back(left);\n                }\n                char lc = s&#91;left++];\n                if(need.count(lc)) {\n                    if(need&#91;lc] == window&#91;lc]) vaild--;\n                    window&#91;lc]--;\n                }\n            }\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\/subarray-sum-equals-k\/\">560. \u548c\u4e3a K \u7684\u5b50\u6570\u7ec4<\/a>\u274c<\/h2>\n\n\n\n<h2 class=\"wp-block-heading\">*<strong>\u4ee5\u4e3a\u662f\u6ed1\u52a8\u7a97\u53e3\uff08\u56e0\u4e3a\u6709\u8d1f\u6570\u4e0d\u597d\u5904\u7406\uff09\uff0c\u5b9e\u5219\u662f\u524d\u7f00\u548c*<\/strong><\/h2>\n\n\n\n<p>*<strong>+\u54c8\u5e0c\uff08\u76f8\u5f53\u4e8e<a href=\"https:\/\/leetcode.cn\/problems\/two-sum\/\">1. \u4e24\u6570\u4e4b\u548c<\/a>\uff09*<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Solution {\npublic:\n    int subarraySum(vector&lt;int&gt;&amp; nums, int k) {\n        int res = 0;\n        unordered_map&lt;int, int&gt; mp;\n        vector&lt;int&gt; preSum;\n        preSum.resize(nums.size() + 1);\n\n        preSum&#91;0] = 0; \/\/\u6ce8\u610f\u8981\u7a7a\u4e00\u4e2a0\uff0c\u5426\u5219\u4f1a\u6f0f\u6389\u793a\u4f8b1\u7684\u7b2c\u4e00\u4e2a\u5b50\u6570\u7ec4\u6216\u8005\u81ea\u8eab\u4e00\u4e2a\u6570\u5c31\u6ee1\u8db3\u7684\u60c5\u51b5\n        for(int i = 0; i &lt; nums.size(); i++) {\n            preSum&#91;i + 1] = preSum&#91;i] + nums&#91;i];\n        }\n\n        for(int i = 0; i &lt; preSum.size(); i++) {\n            cout &lt;&lt; preSum&#91;i] &lt;&lt; \" \";\n            int cnt = mp&#91;preSum&#91;i] - k];\n            if(cnt) {\n                res += cnt;\n                \/\/ cout &lt;&lt; \"-&gt;yes \";\n            }\n            mp&#91;preSum&#91;i]]++;  \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\/sliding-window-maximum\/\">239. \u6ed1\u52a8\u7a97\u53e3\u6700\u5927\u503c<\/a>\u274c<\/h2>\n\n\n\n<p><strong><em>\u81ea\u5b9a\u4e49\u5355\u8c03\u961f\u5217<\/em><\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Solution {\nprivate:\n    class MyQueue {\n    public:\n        deque&lt;int&gt; dq;\n        void pop(int x) {\n            if(!dq.empty() &amp;&amp; dq.front() == x) dq.pop_front();\n        }\n        void push(int x) {\n            while(!dq.empty() &amp;&amp; x &gt; dq.back()) dq.pop_back();     \n            dq.push_back(x);\n        }\n        int front() {\n            return dq.front();\n        }\n    };\npublic:   \n    vector&lt;int&gt; maxSlidingWindow(vector&lt;int&gt;&amp; nums, int k) {\n        vector&lt;int&gt; res;\n        MyQueue que;\n        for(int i = 0; i &lt; k; i++) que.push(nums&#91;i]);\n        res.push_back(que.front());\n        for(int i = k; i &lt; nums.size(); i++) {\n            que.pop(nums&#91;i-k]);\n            que.push(nums&#91;i]);\n            res.push_back(que.front());\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\/minimum-window-substring\/\">76. \u6700\u5c0f\u8986\u76d6\u5b50\u4e32<\/a>\u274c<\/h2>\n\n\n\n<p><em><strong>\u6ed1\u52a8\u7a97\u53e3\u7ecf\u5178\u9898<\/strong><\/em><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Solution {\npublic:\n    string minWindow(string s, string t) {\n        \/\/ key\u662f\u5b57\u7b26\uff0cvalue\u662f\u4e2a\u6570\uff1bneed\u662ft\u7684\u5b57\u7b26\uff0cwindow\u662f\u5f53\u524d\u7a97\u53e3\u7684\u5b57\u7b26\n        unordered_map&lt;char, int> need, window;\n        for(auto &amp;c : t) need&#91;c]++;\n\n        int left = 0;\n        int valid = 0;\n        string res;\n        \/\/ \u6700\u597d\u4e0d\u8981\u7528while\u5faa\u73af\uff0c\u56e0\u4e3aright\u662f\u5728\u6bcf\u6b21\u5faa\u73af\u6700\u540e\uff0c\u5373\u7edf\u8ba1\u5b8c\u4e4b\u540e\u624d++\n        for(int right = 0; right &lt; s.size(); right++) {\n            \/\/ \u66f4\u65b0\u53f3\u8fb9\u754c\n            char ch = s&#91;right];\n            window&#91;ch]++;\n            \/\/ window&#91;ch]\u81f3\u5c11\u4e3a1\uff0c\u5982\u679cwindow&#91;ch] &lt;= need&#91;ch]\uff0c\u8bf4\u660ech\u662f\u9700\u8981\u7684\u5b57\u7b26(\u5c5e\u4e8et)\n            if(window&#91;ch] &lt;= need&#91;ch]) { \n                valid++;\n            }\n            \/\/ \u66f4\u65b0\u5de6\u8fb9\u754c\n            while(window&#91;s&#91;left]] > need&#91;s&#91;left]]) { \/\/ \u5982\u679c\u5de6\u8fb9\u754c\u5b57\u7b26\u591a\u4f59\u4e86\n                window&#91;s&#91;left]]--;\n                left++;\n            }\n            \/\/ \u5df2\u7ecf\u8986\u76d6\n            if(valid == t.size()) {\n                if(res.size() == 0 || right - left + 1 &lt; res.size()) {\n                    res = s.substr(left, right - left + 1);\n                }\n            }\n            \/\/ \u4e0d\u7528\u628avalid\u91cd\u7f6e\u4e3a0\uff0c\u53ea\u9700\u7b49\u53f3\u8fb9\u754c\u627e\u5230\u66ff\u4ee3\u54c1\uff0c\u5de6\u8fb9\u754c\u81ea\u7136\u4f1a\u7f29\uff0cres\u5c31\u4f1a\u66f4\u65b0\n        }\n        return res;\n    }\n};<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/leetcode.cn\/problems\/subarray-sum-equals-k\/\"><\/a><div id=\"__next\"><a href=\"https:\/\/leetcode.cn\/problems\/subarray-sum-equals-k\/\"><\/a><div class=\"flex h-[100vh] min-w-[360px] flex-col  text-label-1 dark:text-dark-label-1 overflow-x-auto\"><a href=\"https:\/\/leetcode.cn\/problems\/subarray-sum-equals-k\/\"><\/a><div class=\"h-[100vh] bg-gray-2 dark:bg-dark-layer-bg min-w-[1000px]\"><a href=\"https:\/\/leetcode.cn\/problems\/subarray-sum-equals-k\/\"><\/a><div class=\"flex h-full w-full flex-col bg-layer-bg-gray dark:bg-layer-bg-gray\"><a href=\"https:\/\/leetcode.cn\/problems\/subarray-sum-equals-k\/\"><\/a><div class=\"flex w-full flex-grow overflow-y-hidden p-[10px] pt-0\"><a href=\"https:\/\/leetcode.cn\/problems\/subarray-sum-equals-k\/\"><\/a><div id=\"qd-content\" class=\"relative flex h-full w-full\"><a href=\"https:\/\/leetcode.cn\/problems\/subarray-sum-equals-k\/\"><\/a><div class=\"flexlayout__layout\"><a href=\"https:\/\/leetcode.cn\/problems\/subarray-sum-equals-k\/\"><\/a><div class=\"flexlayout__tab\" data-layout-path=\"\/ts0\/t0\" id=\"edc5f776-7397-487d-05e1-e69e8676d0d0\"><a href=\"https:\/\/leetcode.cn\/problems\/subarray-sum-equals-k\/\"><\/a><div class=\"flex h-full w-full flex-col\"><a href=\"https:\/\/leetcode.cn\/problems\/subarray-sum-equals-k\/\"><\/a><div class=\"flex w-full flex-1 flex-col gap-4 overflow-y-auto px-4 py-5\"><a href=\"https:\/\/leetcode.cn\/problems\/subarray-sum-equals-k\/\"><\/a><div class=\"flex items-start justify-between gap-4\"><a href=\"https:\/\/leetcode.cn\/problems\/subarray-sum-equals-k\/\"><\/a><div class=\"flex items-start gap-2\"><a href=\"https:\/\/leetcode.cn\/problems\/subarray-sum-equals-k\/\"><\/a><div class=\"text-title-large font-semibold text-text-primary dark:text-text-primary\"><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/h2>\n","protected":false},"excerpt":{"rendered":"<p>\u6ed1\u52a8\u7a97\u53e3\u5927\u81f4\u903b\u8f91\uff1a \u6ed1\u52a8\u7a97\u53e3\u7b97\u6cd5\u6846\u67b6\uff1a \u5957\u6a21\u677f\u65f6\u8003\u8651\u4ee5\u4e0b\u56db\u4e2a\u95ee\u9898\uff1a 3. \u65e0\u91cd\u590d\u5b57\u7b26\u7684\u6700\u957f\u5b50\u4e32\u2705 \u66b4\u529b\uff1a\u7528ma [&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":[18,19,32,31],"class_list":["post-660","post","type-post","status-publish","format-standard","hentry","category-suanfa","tag-leetcode","tag-19","tag-32","tag-31"],"_links":{"self":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts\/660","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=660"}],"version-history":[{"count":29,"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts\/660\/revisions"}],"predecessor-version":[{"id":2773,"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts\/660\/revisions\/2773"}],"wp:attachment":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=660"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=660"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=660"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}