{"id":618,"date":"2026-07-10T16:16:21","date_gmt":"2026-07-10T08:16:21","guid":{"rendered":"https:\/\/mitongxue.cn\/?p=618"},"modified":"2026-07-10T16:16:21","modified_gmt":"2026-07-10T08:16:21","slug":"%e6%9c%80%e5%b0%8f%e8%a6%86%e7%9b%96%e5%ad%90%e4%b8%b2","status":"publish","type":"post","link":"https:\/\/mitongxue.cn\/index.php\/2026\/07\/10\/%e6%9c%80%e5%b0%8f%e8%a6%86%e7%9b%96%e5%ad%90%e4%b8%b2\/","title":{"rendered":"\u6700\u5c0f\u8986\u76d6\u5b50\u4e32"},"content":{"rendered":"\n

\u63cf\u8ff0<\/h2>\n\n\n\n

\u7ed9\u51fa\u4e24\u4e2a\u5b57\u7b26\u4e32 s \u548c t\uff0c\u8981\u6c42\u5728 s \u4e2d\u627e\u51fa\u6700\u77ed\u7684\u5305\u542b t \u4e2d\u6240\u6709\u5b57\u7b26\u7684\u8fde\u7eed\u5b50\u4e32\u3002<\/p>\n\n\n\n

\u6570\u636e\u8303\u56f4\uff1a0<\/mn>\u2264<\/mo>\u2223<\/mi>S<\/mi>\u2223<\/mi>,<\/mo>\u2223<\/mi>T<\/mi>\u2223<\/mi>\u2264<\/mo>10000<\/mn><\/mrow><\/semantics><\/math>0\u2264\u2223S<\/em>\u2223,\u2223T<\/em>\u2223\u226410000\uff0c\u4fdd\u8bc1s\u548ct\u5b57\u7b26\u4e32\u4e2d\u4ec5\u5305\u542b\u5927\u5c0f\u5199\u82f1\u6587\u5b57\u6bcd<\/p>\n\n\n\n

\u8981\u6c42\uff1a\u8fdb\u9636\uff1a\u7a7a\u95f4\u590d\u6742\u5ea6 O<\/mi>(<\/mo>n<\/mi>)<\/mo><\/mrow><\/semantics><\/math>O<\/em>(n<\/em>) \uff0c \u65f6\u95f4\u590d\u6742\u5ea6 O<\/mi>(<\/mo>n<\/mi>)<\/mo><\/mrow><\/semantics><\/math>O<\/em>(n<\/em>)<\/p>\n\n\n\n

\u4f8b\u5982\uff1a<\/p>\n\n\n\n

S<\/mi>=<\/mo>\"<\/mi>X<\/mi>D<\/mi>O<\/mi>Y<\/mi>E<\/mi>Z<\/mi>O<\/mi>D<\/mi>E<\/mi>Y<\/mi>X<\/mi>N<\/mi>Z<\/mi>\"<\/mi><\/mrow><\/semantics><\/math>S<\/em>=\"X<\/em>D<\/em>O<\/em>Y<\/em>E<\/em>Z<\/em>O<\/em>D<\/em>E<\/em>Y<\/em>X<\/em>N<\/em>Z<\/em>\"
T<\/mi>=<\/mo>\"<\/mi>X<\/mi>Y<\/mi>Z<\/mi>\"<\/mi><\/mrow><\/semantics><\/math>T<\/em>=\"X<\/em>Y<\/em>Z<\/em>\"
\u627e\u51fa\u7684\u6700\u77ed\u5b50\u4e32\u4e3a\"<\/mi>Y<\/mi>X<\/mi>N<\/mi>Z<\/mi>\"<\/mi><\/mrow><\/semantics><\/math>\"Y<\/em>X<\/em>N<\/em>Z<\/em>\".<\/code><\/pre>\n\n\n\n
\u6ce8\u610f\uff1a
\u5982\u679c s \u4e2d\u6ca1\u6709\u5305\u542b t \u4e2d\u6240\u6709\u5b57\u7b26\u7684\u5b50\u4e32\uff0c\u8fd4\u56de\u7a7a\u5b57\u7b26\u4e32 \u201c\u201d\uff1b
\u6ee1\u8db3\u6761\u4ef6\u7684\u5b50\u4e32\u53ef\u80fd\u6709\u5f88\u591a\uff0c\u4f46\u662f\u9898\u76ee\u4fdd\u8bc1\u6ee1\u8db3\u6761\u4ef6\u7684\u6700\u77ed\u7684\u5b50\u4e32\u552f\u4e00\u3002<\/p>\n\n\n\n
\u793a\u4f8b1<\/h2>\n\n\n\n
\u8f93\u5165\uff1a<\/p>\n\n\n\n
\"XDOYEZODEYXNZ\",\"XYZ\"<\/code><\/pre>\n\n\n\n
\u8fd4\u56de\u503c\uff1a<\/p>\n\n\n\n
\"YXNZ\"<\/code><\/pre>\n\n\n\n
\u793a\u4f8b2<\/h2>\n\n\n\n
\u8f93\u5165\uff1a<\/p>\n\n\n\n
\"abcAbA\",\"AA\"<\/code><\/pre>\n\n\n\n
\u8fd4\u56de\u503c\uff1a<\/p>\n\n\n\n
\"AbA\"<\/code><\/pre>\n\n\n\n
\u601d\u8def<\/h2>\n\n\n\n
    \n
  1. \u8bb0\u5f55\u9700\u8981\u7684\u5b57\u7b26\u4e32\uff0c\u5e76\u7edf\u8ba1\u6570\u91cf\uff0c\u53ef\u80fd\u5b58\u5728\u91cd\u590d\u5b57\u7b26\u7684\u53ef\u80fd\uff1b<\/li>\n\n\n\n
  2. \u53f3\u6307\u9488\u671d\u53f3\u6ed1\u52a8\uff0c\u7edf\u8ba1\u7b26\u5408\u8981\u6c42\u7684\u5b57\u7b26\u6570\u91cf\uff0c\u5982\u679c\u5355\u4e2a\u5b57\u7b26\u8fbe\u5230\u8981\u6c42\uff0cvalid++;<\/li>\n\n\n\n
  3. \u5f53\u9700\u6c42\u6570\u91cf\u6ee1\u8db3\u65f6\uff0c\u66f4\u65b0\u6700\u5c0f\u5b57\u7b26\u957f\u5ea6\uff0c\u5e76\u8bb0\u5f55\u5f00\u59cb\u4f4d\u7f6e\uff0c<\/li>\n\n\n\n
  4. \u901a\u8fc7\u79fb\u52a8left\u6307\u9488\uff0c\u7f29\u5c0f\u7a97\u53e3\uff0c\u9700\u8981\u5224\u65ad\u5f53\u524d\u5b57\u7b26\u662f\u5426\u662f\u9700\u8981\u5b57\u7b26\uff0c\u9700\u8981\u4fee\u6539\u7edf\u8ba1\u5b57\u7b26\u548cvalid.<\/li>\n<\/ol>\n\n\n\n
    \/**\n * \u4ee3\u7801\u4e2d\u7684\u7c7b\u540d\u3001\u65b9\u6cd5\u540d\u3001\u53c2\u6570\u540d\u5df2\u7ecf\u6307\u5b9a\uff0c\u8bf7\u52ff\u4fee\u6539\uff0c\u76f4\u63a5\u8fd4\u56de\u65b9\u6cd5\u89c4\u5b9a\u7684\u503c\u5373\u53ef\n *\n *\n * @param S string\u5b57\u7b26\u4e32\n * @param T string\u5b57\u7b26\u4e32\n * @return string\u5b57\u7b26\u4e32\n *\/\nfunction minWindow(S, T) {\n       const need = new Map();\n       for(ch of T){\n         need.set(ch, (need.get(ch)||0)+1)\n       }\n       \/\/console.log(need,'need')\n       let left = 0;\n       let right = 0;\n       let valid = 0;\n       let minLen = Infinity;\n       let start = 0;\n       const own = new Map();\n\n        while(right < S.length){\n            const cur = S[right];\n            if(need.has(cur) ){\n                own.set(cur,(own.get(cur)||0)+1);\n                if(need.get(cur) === own.get(cur)){\n                    valid++;\n                }\n            }\n            right++;\n            while(valid === need.size){\n                \/\/console.log(right-1,'right');\n                const temp = S[left];\n                if(right - left < minLen){\n                    minLen = right - left;\n                    start = left;\n                }\n\n                left++;\n                if(need.has(temp)){\n                    \n                    if(need.get(temp) === own.get(temp)){\n                        valid--;\n                    }\n                    \/\/\u4e0d\u80fd\u5148\u51cf\n                    own.set(temp,own.get(temp)-1);\n                }\n\n            }\n        }\n        return minLen === Infinity ? \"\" : S.slice(start,start + minLen);\n    \n}\nmodule.exports = {\n    minWindow: minWindow,\n};<\/code><\/pre>\n\n\n\n
    \u6ce8\u610f\uff1a<\/p>\n\n\n\n
     if(need.get(temp) === own.get(temp)){\n      valid--;\n }\n\/\/\u4e0d\u80fd\u5148\u51cf\nown.set(temp,own.get(temp)-1);<\/code><\/pre>\n\n\n\n
    <\/p>\n","protected":false},"excerpt":{"rendered":"
    \u63cf\u8ff0 \u7ed9\u51fa\u4e24\u4e2a\u5b57\u7b26\u4e32 s \u548c t\uff0c\u8981\u6c42\u5728..<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16,11,51],"tags":[],"class_list":["post-618","post","type-post","status-publish","format-standard","hentry","category-js","category-front","category-51"],"featured_image_urls":{"full":"","thumbnail":"","medium":"","medium_large":"","large":"","1536x1536":"","2048x2048":""},"author_info":{"info":["\u9648 \u67d0\u4eba"]},"category_info":"JS<\/a> \u524d\u7aef<\/a> \u725b\u5ba2<\/a>","tag_info":"\u725b\u5ba2","comment_count":"0","_links":{"self":[{"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/posts\/618","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/comments?post=618"}],"version-history":[{"count":1,"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/posts\/618\/revisions"}],"predecessor-version":[{"id":619,"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/posts\/618\/revisions\/619"}],"wp:attachment":[{"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/media?parent=618"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/categories?post=618"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mitongxue.cn\/index.php\/wp-json\/wp\/v2\/tags?post=618"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}