{"id":176,"date":"2025-08-26T15:38:40","date_gmt":"2025-08-26T07:38:40","guid":{"rendered":"https:\/\/heyingnian.com\/?p=176"},"modified":"2025-08-26T15:47:10","modified_gmt":"2025-08-26T07:47:10","slug":"leetcode-76","status":"publish","type":"post","link":"https:\/\/heyingnian.com\/index.php\/2025\/08\/26\/leetcode-76\/","title":{"rendered":"\u6700\u5c0f\u8986\u76d6\u5b50\u4e32"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">\ud83d\udd17 \u6700\u5c0f\u8986\u76d6\u5b50\u4e32<\/h1>\n\n\n\n<p>\u9898\u76ee\u6765\u6e90\uff1a<a target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/leetcode.cn\/problems\/minimum-window-substring\/description\/?envType=study-plan-v2&amp;envId=top-100-liked\" target=\"_blank\" rel=\"noopener\">76. \u6700\u5c0f\u8986\u76d6\u5b50\u4e32 &#8211; \u529b\u6263\uff08LeetCode\uff09<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\ud83d\udccc \u9898\u76ee\u63cf\u8ff0<\/p>\n\n\n\n<p>\u7ed9\u4f60\u4e24\u4e2a\u5b57\u7b26\u4e32 <code>s<\/code> \u548c <code>t<\/code>\uff0c\u8fd4\u56de <code>s<\/code> \u4e2d\u6db5\u76d6 <code>t<\/code> \u6240\u6709\u5b57\u7b26\u7684<strong>\u6700\u5c0f\u7a97\u53e3\u5b50\u4e32<\/strong>\u3002\u5982\u679c\u4e0d\u5b58\u5728\u7b26\u5408\u6761\u4ef6\u7684\u5b50\u4e32\uff0c\u5219\u8fd4\u56de\u7a7a\u5b57\u7b26\u4e32 <code>\"\"<\/code>\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u8986\u76d6<\/strong>\uff1a\u5b50\u4e32\u5fc5\u987b\u5305\u542b&nbsp;<code>t<\/code>&nbsp;\u4e2d\u7684\u6240\u6709\u5b57\u7b26\uff0c\u5305\u62ec\u91cd\u590d\u5b57\u7b26\u3002<\/li>\n\n\n\n<li><strong>\u6700\u5c0f\u7a97\u53e3<\/strong>\uff1a\u5728\u6240\u6709\u6ee1\u8db3\u6761\u4ef6\u7684\u5b50\u4e32\u4e2d\uff0c\u957f\u5ea6\u6700\u77ed\u7684\u90a3\u4e2a\u3002<\/li>\n\n\n\n<li>\u82e5\u6709\u591a\u4e2a\u76f8\u540c\u957f\u5ea6\u7684\u6700\u5c0f\u8986\u76d6\u5b50\u4e32\uff0c\u8fd4\u56de\u4efb\u610f\u4e00\u4e2a\u5373\u53ef\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u2705 \u793a\u4f8b\u89e3\u6790<\/p>\n\n\n\n<p>\u793a\u4f8b 1\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8f93\u5165\uff1a<code>s = \"ADOBECODEBANC\"<\/code>,&nbsp;<code>t = \"ABC\"<\/code><\/li>\n\n\n\n<li>\u8f93\u51fa\uff1a<code>\"BANC\"<\/code><\/li>\n\n\n\n<li>\u89e3\u91ca\uff1a<code>\"BANC\"<\/code>&nbsp;\u662f\u552f\u4e00\u5305\u542b&nbsp;<code>'A'<\/code>\u3001<code>'B'<\/code>\u3001<code>'C'<\/code>&nbsp;\u7684\u6700\u77ed\u5b50\u4e32\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u793a\u4f8b 2\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8f93\u5165\uff1a<code>s = \"a\"<\/code>,&nbsp;<code>t = \"a\"<\/code><\/li>\n\n\n\n<li>\u8f93\u51fa\uff1a<code>\"a\"<\/code><\/li>\n\n\n\n<li>\u89e3\u91ca\uff1a<code>s<\/code>&nbsp;\u4e0e&nbsp;<code>t<\/code>&nbsp;\u76f8\u540c\uff0c\u76f4\u63a5\u8fd4\u56de\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u793a\u4f8b 3\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8f93\u5165\uff1a<code>s = \"a\"<\/code>,&nbsp;<code>t = \"aa\"<\/code><\/li>\n\n\n\n<li>\u8f93\u51fa\uff1a<code>\"\"<\/code><\/li>\n\n\n\n<li>\u89e3\u91ca\uff1a<code>s<\/code>&nbsp;\u4e2d&nbsp;<code>'a'<\/code>&nbsp;\u53ea\u51fa\u73b0\u4e00\u6b21\uff0c\u65e0\u6cd5\u8986\u76d6&nbsp;<code>t<\/code>&nbsp;\u4e2d\u4e24\u4e2a&nbsp;<code>'a'<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u26a0\ufe0f \u63d0\u793a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>1 &lt;= s.length, t.length &lt;= 10\u2075<\/code><\/li>\n\n\n\n<li><code>s<\/code>&nbsp;\u548c&nbsp;<code>t<\/code>&nbsp;\u7531\u82f1\u6587\u5b57\u6bcd\u7ec4\u6210<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\ud83d\udca1 \u89e3\u6cd5\uff1a\u6ed1\u52a8\u7a97\u53e3 + \u5b57\u7b26\u9891\u6b21\u7edf\u8ba1 \u2014\u2014 O(m + n) \u65f6\u95f4<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code><strong>class<\/strong> <strong>Solution<\/strong> {\n    <strong>public<\/strong> String <strong>minWindow<\/strong>(String s, String t) {\n        <strong>char<\/strong>&#91;] sarr = s.toCharArray();\n        <strong>char<\/strong>&#91;] tarr = t.toCharArray();\n        <strong>int<\/strong> slen = sarr.length, tlen = tarr.length;\n        <strong>if<\/strong> (slen &lt; tlen) {\n            <strong>return<\/strong> \"\";\n        }\n        <strong>int<\/strong> number = 0;\n        <strong>int<\/strong>&#91;] curr = <strong>new<\/strong> <strong>int<\/strong>&#91;128];\n        <strong>for<\/strong> (<strong>int<\/strong> i = 0; i &lt; tlen; i++) {\n            <strong>if<\/strong> (curr&#91;tarr&#91;i]] == 0) {\n                number++;\n            }\n            curr&#91;tarr&#91;i]]++;\n        }\n        <strong>int<\/strong> ansl = -1, ansr = slen - 1, left = 0;\n        <strong>for<\/strong> (<strong>int<\/strong> right = 0; right &lt; slen; right++) {\n            curr&#91;sarr&#91;right]]--;\n            <strong>if<\/strong> (curr&#91;sarr&#91;right]] == 0) {\n                number--;\n            }\n            <strong>while<\/strong> (number == 0) {\n                <strong>if<\/strong> (right - left &lt; ansr - ansl) {\n                    ansl = left;\n                    ansr = right;\n                }\n                <strong>if<\/strong> (curr&#91;sarr&#91;left]] == 0) {\n                    number++;\n                }\n                curr&#91;sarr&#91;left]]++;\n                left++;\n            }\n        }\n        <strong>return<\/strong> ansl == -1 ? \"\" : s.substring(ansl, ansr + 1);\n    }\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\ud83d\udcca \u590d\u6742\u5ea6\u5206\u6790<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u65f6\u95f4\u590d\u6742\u5ea6\uff1aO(m + n)<\/strong>\n<ul class=\"wp-block-list\">\n<li><code>m<\/code>&nbsp;\u4e3a&nbsp;<code>s<\/code>&nbsp;\u7684\u957f\u5ea6\uff0c<code>n<\/code>&nbsp;\u4e3a&nbsp;<code>t<\/code>&nbsp;\u7684\u957f\u5ea6<\/li>\n\n\n\n<li>\u521d\u59cb\u5316&nbsp;<code>t<\/code>&nbsp;\u7684\u5b57\u7b26\u9891\u6b21\uff1aO(n)<\/li>\n\n\n\n<li>\u6ed1\u52a8\u7a97\u53e3\u904d\u5386&nbsp;<code>s<\/code>\uff1a\u6bcf\u4e2a\u5b57\u7b26\u6700\u591a\u88ab&nbsp;<code>right<\/code>&nbsp;\u548c&nbsp;<code>left<\/code>&nbsp;\u5404\u8bbf\u95ee\u4e00\u6b21\uff0cO(m)<\/li>\n\n\n\n<li>\u603b\u4f53\u4e3a\u7ebf\u6027\u65f6\u95f4\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7a7a\u95f4\u590d\u6742\u5ea6\uff1aO(1)<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528\u56fa\u5b9a\u957f\u5ea6&nbsp;<code>128<\/code>&nbsp;\u7684\u6570\u7ec4\uff08ASCII \u5b57\u7b26\u96c6\uff09\u5b58\u50a8\u5b57\u7b26\u9891\u6b21<\/li>\n\n\n\n<li>\u7a7a\u95f4\u4e0d\u968f\u8f93\u5165\u89c4\u6a21\u53d8\u5316\uff0c\u89c6\u4e3a\u5e38\u6570\u7a7a\u95f4\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\ud83e\udde9 \u89e3\u9898\u601d\u8def<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u6ed1\u52a8\u7a97\u53e3\u6846\u67b6<\/strong>\uff1a<br>\u4f7f\u7528\u53cc\u6307\u9488 <code>left<\/code> \u548c <code>right<\/code> \u7ef4\u62a4\u4e00\u4e2a\u7a97\u53e3 <code>[left, right]<\/code>\uff0c\u76ee\u6807\u662f\u627e\u5230\u80fd\u8986\u76d6 <code>t<\/code> \u7684\u6700\u77ed\u533a\u95f4\u3002<\/li>\n\n\n\n<li><strong>\u9891\u6b21\u6570\u7ec4\u4e0e\u5339\u914d\u8ba1\u6570<\/strong>\uff1a\n<ul class=\"wp-block-list\">\n<li><code>curr[128]<\/code>\uff1a\u8bb0\u5f55&nbsp;<code>t<\/code>&nbsp;\u4e2d\u6bcf\u4e2a\u5b57\u7b26\u7684\u201c\u5269\u4f59\u9700\u6c42\u91cf\u201d\u3002\n<ul class=\"wp-block-list\">\n<li>\u521d\u59cb\u5316\u65f6\uff0c<code>curr[c]++<\/code>&nbsp;\u8868\u793a\u5b57\u7b26&nbsp;<code>c<\/code>&nbsp;\u9700\u8981\u88ab\u8986\u76d6\u7684\u6b21\u6570\u3002<\/li>\n\n\n\n<li>\u5728&nbsp;<code>s<\/code>&nbsp;\u4e2d\u6bcf\u9047\u5230\u4e00\u4e2a&nbsp;<code>c<\/code>\uff0c<code>curr[c]--<\/code>\uff0c\u8868\u793a\u9700\u6c42\u51cf\u5c11\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><code>number<\/code>\uff1a\u8868\u793a\u5f53\u524d\u8fd8\u6709\u591a\u5c11\u79cd\u5b57\u7b26\u7684\u201c\u9700\u6c42\u91cf\u201d\u5c1a\u672a\u6ee1\u8db3\uff08\u5373&nbsp;<code>curr[c] &gt; 0<\/code>&nbsp;\u7684\u79cd\u7c7b\u6570\uff09\u3002\n<ul class=\"wp-block-list\">\n<li>\u5f53&nbsp;<code>number == 0<\/code>&nbsp;\u65f6\uff0c\u8bf4\u660e\u5f53\u524d\u7a97\u53e3\u5df2\u5b8c\u5168\u8986\u76d6&nbsp;<code>t<\/code>\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7a97\u53e3\u6269\u5c55\uff08\u53f3\u6307\u9488\u79fb\u52a8\uff09<\/strong>\uff1a\n<ul class=\"wp-block-list\">\n<li><code>right<\/code>&nbsp;\u4ece&nbsp;<code>0<\/code>&nbsp;\u5f00\u59cb\u5411\u53f3\u79fb\u52a8\uff0c\u5c06&nbsp;<code>s[right]<\/code>&nbsp;\u52a0\u5165\u7a97\u53e3\u3002<\/li>\n\n\n\n<li>\u6267\u884c&nbsp;<code>curr[sarr[right]]--<\/code>\uff0c\u82e5\u51cf\u4e3a&nbsp;<code>0<\/code>\uff0c\u8bf4\u660e\u8be5\u5b57\u7b26\u7684\u9700\u6c42\u521a\u597d\u6ee1\u8db3\uff0c<code>number--<\/code>\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7a97\u53e3\u6536\u7f29\uff08\u5de6\u6307\u9488\u79fb\u52a8\uff09<\/strong>\uff1a\n<ul class=\"wp-block-list\">\n<li>\u5f53&nbsp;<code>number == 0<\/code>\uff0c\u8bf4\u660e\u5f53\u524d\u7a97\u53e3\u5df2\u8986\u76d6&nbsp;<code>t<\/code>\uff0c\u5c1d\u8bd5\u6536\u7f29&nbsp;<code>left<\/code>&nbsp;\u4ee5\u5bfb\u627e\u66f4\u5c0f\u7684\u7a97\u53e3\u3002<\/li>\n\n\n\n<li>\u5728&nbsp;<code>while (number == 0)<\/code>&nbsp;\u5faa\u73af\u4e2d\uff1a\n<ul class=\"wp-block-list\">\n<li>\u6bd4\u8f83\u5f53\u524d\u7a97\u53e3&nbsp;<code>right - left<\/code>&nbsp;\u662f\u5426\u6bd4\u5df2\u8bb0\u5f55\u7684\u66f4\u77ed\uff0c\u82e5\u662f\u5219\u66f4\u65b0&nbsp;<code>ansl<\/code>&nbsp;\u548c&nbsp;<code>ansr<\/code>\u3002<\/li>\n\n\n\n<li>\u5c06&nbsp;<code>sarr[left]<\/code>&nbsp;\u79fb\u51fa\u7a97\u53e3\uff1a\n<ul class=\"wp-block-list\">\n<li>\u82e5&nbsp;<code>curr[sarr[left]] == 0<\/code>\uff0c\u8bf4\u660e\u79fb\u51fa\u540e\u8be5\u5b57\u7b26\u5c06\u4e0d\u518d\u6ee1\u8db3\u9700\u6c42\uff0c<code>number++<\/code><\/li>\n\n\n\n<li>\u6267\u884c&nbsp;<code>curr[sarr[left]]++<\/code>\uff0c\u6062\u590d\u5176\u9700\u6c42\u91cf<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><code>left++<\/code>\uff0c\u7ee7\u7eed\u6536\u7f29\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7b54\u6848\u66f4\u65b0<\/strong>\uff1a\n<ul class=\"wp-block-list\">\n<li>\u53ea\u6709\u5728\u7a97\u53e3\u6ee1\u8db3\u8986\u76d6\u6761\u4ef6\uff08<code>number == 0<\/code>\uff09\u65f6\u624d\u66f4\u65b0\u7b54\u6848\u3002<\/li>\n\n\n\n<li>\u4f7f\u7528&nbsp;<code>ansl == -1<\/code>&nbsp;\u5224\u65ad\u662f\u5426\u627e\u5230\u6709\u6548\u89e3\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u8fb9\u754c\u5904\u7406<\/strong>\uff1a\n<ul class=\"wp-block-list\">\n<li>\u82e5&nbsp;<code>s.length &lt; t.length<\/code>\uff0c\u76f4\u63a5\u8fd4\u56de&nbsp;<code>\"\"<\/code>\uff0c\u4e0d\u53ef\u80fd\u8986\u76d6\u3002<\/li>\n\n\n\n<li>\u521d\u59cb&nbsp;<code>ansr = slen - 1<\/code>\uff0c\u786e\u4fdd\u7b2c\u4e00\u6b21\u66f4\u65b0\u65f6\u80fd\u6b63\u786e\u6bd4\u8f83\u957f\u5ea6\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\ud83d\udd17 \u6700\u5c0f\u8986\u76d6\u5b50\u4e32 \u9898\u76ee\u6765\u6e90\uff1a76. \u6700\u5c0f\u8986\u76d6\u5b50\u4e32 &#8211; \u529b\u6263\uff08LeetCode\uff09 \ud83d\udccc \u9898\u76ee\u63cf\u8ff0 \u7ed9\u4f60 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[27,12],"tags":[24,14],"class_list":["post-176","post","type-post","status-publish","format-standard","hentry","category-substrings","category-algorithm","tag-sliding_window","tag-algorithm"],"_links":{"self":[{"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/posts\/176","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/comments?post=176"}],"version-history":[{"count":2,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/posts\/176\/revisions"}],"predecessor-version":[{"id":182,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/posts\/176\/revisions\/182"}],"wp:attachment":[{"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/media?parent=176"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/categories?post=176"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/heyingnian.com\/index.php\/wp-json\/wp\/v2\/tags?post=176"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}