{"id":116011,"date":"2026-10-20T15:40:41","date_gmt":"2026-10-20T07:40:41","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/116011.html"},"modified":"2026-10-20T15:40:41","modified_gmt":"2026-10-20T07:40:41","slug":"deepseek-leetcode-394-%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%a7%a3%e7%a0%81-java%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/116011.html","title":{"rendered":"DeepSeek LeetCode 394. \u5b57\u7b26\u4e32\u89e3\u7801 Java\u5b9e\u73b0"},"content":{"rendered":"

LeetCode 394. \u5b57\u7b26\u4e32\u89e3\u7801 – Java \u5b9e\u73b0<\/p>\n

\u9898\u76ee\u56de\u987e<\/p>\n

\u7ed9\u5b9a\u7f16\u7801\u5b57\u7b26\u4e32，\u89c4\u5219\u4e3a k[encoded_string]，\u8868\u793a\u65b9\u62ec\u53f7\u5185\u7684\u5b57\u7b26\u4e32\u91cd\u590d k \u6b21\u3002\u53ef\u5d4c\u5957\u3002\u8fd4\u56de\u89e3\u7801\u540e\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n

\u4f8b\u5982：\u201c3[a2[c]]\u201d \u2192 \u201caccaccacc\u201d\u3002<\/p>\n

\u89e3\u6cd5\u4e00：\u53cc\u6808（\u63a8\u8350，\u6700\u76f4\u89c2）<\/p>\n

\u7528\u4e24\u4e2a\u6808\u5206\u522b\u4fdd\u5b58\u91cd\u590d\u6b21\u6570\u548c\u8fdb\u5165\u62ec\u53f7\u524d\u7684\u5df2\u62fc\u63a5\u5b57\u7b26\u4e32\u3002<\/p>\n

\u904d\u5386\u6bcf\u4e2a\u5b57\u7b26：<\/p>\n

\u5b57\u7b26 \u64cd\u4f5c
\n\u6570\u5b57 \u7d2f\u79ef\u6210\u591a\u4f4d\u6570\u5b57 num
\n[ \u5c06 num \u548c res \u5165\u6808，\u91cd\u7f6e num=0\u3001res=\u201c\u201d
\n] \u5f39\u51fa count \u548c prev，res = prev + res.repeat(count)
\n\u5b57\u6bcd res += c<\/p>\n

class<\/span> Solution<\/span> {<\/span>
\n public<\/span> String<\/span> decodeString<\/span>(<\/span>String<\/span> s)<\/span> {<\/span>
\n Deque<\/span><<\/span>Integer<\/span>><\/span><\/span> countStack =<\/span> new<\/span> ArrayDeque<\/span><<\/span>><\/span><\/span>(<\/span>)<\/span>;<\/span>
\n Deque<\/span><<\/span>String<\/span>><\/span><\/span> strStack =<\/span> new<\/span> ArrayDeque<\/span><<\/span>><\/span><\/span>(<\/span>)<\/span>;<\/span>
\n StringBuilder<\/span> res =<\/span> new<\/span> StringBuilder<\/span>(<\/span>)<\/span>;<\/span>
\n int<\/span> num =<\/span> 0<\/span>;<\/span><\/p>\n

for<\/span> (<\/span>char<\/span> c :<\/span> s.<\/span>toCharArray<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
\n if<\/span> (<\/span>Character<\/span>.<\/span>isDigit<\/span>(<\/span>c)<\/span>)<\/span> {<\/span>
\n num =<\/span> num *<\/span> 10<\/span> +<\/span> (<\/span>c –<\/span> '0'<\/span>)<\/span>;<\/span> \/\/ \u5904\u7406\u591a\u4f4d\u6570\u5b57<\/span>
\n }<\/span> else<\/span> if<\/span> (<\/span>c ==<\/span> '['<\/span>)<\/span> {<\/span>
\n countStack.<\/span>push<\/span>(<\/span>num)<\/span>;<\/span> \/\/ \u4fdd\u5b58\u91cd\u590d\u6b21\u6570<\/span>
\n strStack.<\/span>push<\/span>(<\/span>res.<\/span>toString<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ \u4fdd\u5b58\u5916\u5c42\u5df2\u62fc\u597d\u7684\u4e32<\/span>
\n num =<\/span> 0<\/span>;<\/span>
\n res.<\/span>setLength<\/span>(<\/span>0<\/span>)<\/span>;<\/span> \/\/ \u91cd\u7f6e，\u5f00\u59cb\u62fc\u62ec\u53f7\u5185<\/span>
\n }<\/span> else<\/span> if<\/span> (<\/span>c ==<\/span> ']'<\/span>)<\/span> {<\/span>
\n int<\/span> count =<\/span> countStack.<\/span>pop<\/span>(<\/span>)<\/span>;<\/span>
\n StringBuilder<\/span> tmp =<\/span> new<\/span> StringBuilder<\/span>(<\/span>strStack.<\/span>pop<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> count;<\/span> i++<\/span>)<\/span> {<\/span>
\n tmp.<\/span>append<\/span>(<\/span>res)<\/span>;<\/span>
\n }<\/span>
\n res =<\/span> tmp;<\/span>
\n }<\/span> else<\/span> {<\/span>
\n res.<\/span>append<\/span>(<\/span>c)<\/span>;<\/span> \/\/ \u666e\u901a\u5b57\u6bcd<\/span>
\n }<\/span>
\n }<\/span>
\n return<\/span> res.<\/span>toString<\/span>(<\/span>)<\/span>;<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

\u89e3\u6cd5\u4e8c：\u9012\u5f52（\u81ea\u9876\u5411\u4e0b\u89e3\u6790）<\/p>\n

\u9047\u5230 [ \u5c31\u9012\u5f52\u89e3\u6790\u5b50\u4e32，\u8fd4\u56de\u540e\u6309\u6b21\u6570\u62fc\u63a5，\u5e76\u7ee7\u7eed\u4ece\u53f3\u62ec\u53f7\u4e4b\u540e\u5904\u7406\u3002<\/p>\n

class<\/span> Solution<\/span> {<\/span>
\n private<\/span> int<\/span> i =<\/span> 0<\/span>;<\/span> \/\/ \u5168\u5c40\u6307\u9488<\/span><\/p>\n

public<\/span> String<\/span> decodeString<\/span>(<\/span>String<\/span> s)<\/span> {<\/span>
\n StringBuilder<\/span> res =<\/span> new<\/span> StringBuilder<\/span>(<\/span>)<\/span>;<\/span>
\n int<\/span> num =<\/span> 0<\/span>;<\/span><\/p>\n

while<\/span> (<\/span>i <<\/span> s.<\/span>length<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
\n char<\/span> c =<\/span> s.<\/span>charAt<\/span>(<\/span>i)<\/span>;<\/span>
\n if<\/span> (<\/span>Character<\/span>.<\/span>isDigit<\/span>(<\/span>c)<\/span>)<\/span> {<\/span>
\n num =<\/span> num *<\/span> 10<\/span> +<\/span> (<\/span>c –<\/span> '0'<\/span>)<\/span>;<\/span>
\n i++<\/span>;<\/span>
\n }<\/span> else<\/span> if<\/span> (<\/span>c ==<\/span> '['<\/span>)<\/span> {<\/span>
\n i++<\/span>;<\/span> \/\/ \u8df3\u8fc7 '['<\/span>
\n String<\/span> inner =<\/span> decodeString<\/span>(<\/span>s)<\/span>;<\/span> \/\/ \u9012\u5f52\u89e3\u6790\u62ec\u53f7\u5185<\/span>
\n i++<\/span>;<\/span> \/\/ \u8df3\u8fc7 ']'<\/span>
\n for<\/span> (<\/span>int<\/span> k =<\/span> 0<\/span>;<\/span> k <<\/span> num;<\/span> k++<\/span>)<\/span> {<\/span>
\n res.<\/span>append<\/span>(<\/span>inner)<\/span>;<\/span>
\n }<\/span>
\n num =<\/span> 0<\/span>;<\/span>
\n }<\/span> else<\/span> if<\/span> (<\/span>c ==<\/span> ']'<\/span>)<\/span> {<\/span>
\n return<\/span> res.<\/span>toString<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u9047\u5230\u53f3\u62ec\u53f7，\u8fd4\u56de\u7ed9\u4e0a\u5c42<\/span>
\n }<\/span> else<\/span> {<\/span>
\n res.<\/span>append<\/span>(<\/span>c)<\/span>;<\/span>
\n i++<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n return<\/span> res.<\/span>toString<\/span>(<\/span>)<\/span>;<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

\u89e3\u6cd5\u4e09：\u5355\u6808 + \u8bb0\u5f55（\u53ef\u9009）<\/p>\n

\u4e5f\u53ef\u4ee5\u53ea\u7528\u4e00\u4e2a\u6808\u5b58"\u6b21\u6570 \u548c \u5b57\u7b26\u4e32"\u7684\u914d\u5bf9\u5bf9\u8c61，\u4f46\u53cc\u6808\u66f4\u6e05\u6670，\u8fd9\u91cc\u7565\u3002<\/p>\n

\u5173\u952e\u70b9<\/p>\n

  • \u591a\u4f4d\u6570\u5b57：num = num * 10 + (c – \u20180\u2019)，\u4e0d\u80fd\u53ea\u5904\u7406\u4e2a\u4f4d（\u5982 \u201c12[ab]\u201d）\u3002<\/li>\n
  • [ \u65f6\u4fdd\u5b58\u5916\u5c42\u72b6\u6001：\u5165\u6808\u7684\u662f"\u6b64\u523b\u5df2\u7ecf\u62fc\u597d\u7684 res"，\u4e0d\u662f\u7a7a\u4e32，\u8fd9\u6837 ] \u65f6\u53ef\u76f4\u63a5 prev + repeated\u3002<\/li>\n
  • \u5d4c\u5957\u81ea\u7136\u6210\u7acb：\u56e0\u4e3a\u5185\u5c42 [ \u4f1a\u5148\u5165\u6808\u3001] \u5148\u51fa\u6808，\u7b26\u5408\u6808\u7684 LIFO \u8bed\u4e49\u3002<\/li>\n
  • StringBuilder.repeat \u9700 Java 11+；\u4e3a\u517c\u5bb9\u53ef\u7528 for \u5faa\u73af（\u4e0a\u9762\u89e3\u6cd5\u4e00\u5df2\u7528\u5faa\u73af）\u3002<\/li>\n

    \u590d\u6742\u5ea6\u5206\u6790<\/p>\n

    \u00b7 \u65f6\u95f4\u590d\u6742\u5ea6：O(S)，S \u4e3a\u89e3\u7801\u540e\u5b57\u7b26\u4e32\u957f\u5ea6（\u6bcf\u4e2a\u5b57\u7b26\u7684\u751f\u6210\u662f\u5fc5\u8981\u7684）\u3002
    \n\u00b7 \u7a7a\u95f4\u590d\u6742\u5ea6：O(S)，\u6808\u4e0e\u7ed3\u679c\u5b57\u7b26\u4e32\u3002<\/p>\n

    \u793a\u4f8b\u9a8c\u8bc1<\/p>\n

    s = "3[a2[c]]"<\/p>\n

    c='3' num=3
    \nc='[' push(3,""); num=0, res=""
    \nc='a' res="a"
    \nc='2' num=2
    \nc='[' push(2,"a"); num=0, res=""
    \nc='c' res="c"
    \nc=']' count=2 prev="a" -> res = "a"+"c"*2 = "acc"
    \nc=']' count=3 prev="" -> res = "" + "acc"*3 = "accaccacc" \u2713<\/p>\n

    \u89e3\u6cd5\u4e00\u5728\u5de5\u7a0b\u4e0a\u6700\u7a33\u5065，\u89e3\u6cd5\u4e8c\u4ee3\u7801\u66f4\u77ed，\u6309\u9700\u9009\u7528\u5373\u53ef\u3002
    \n\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n","protected":false},"excerpt":{"rendered":"

    LeetCode 394. \u5b57\u7b26\u4e32\u89e3\u7801 – Java \u5b9e\u73b0
    \n\u9898\u76ee\u56de\u987e
    \n\u7ed9\u5b9a\u7f16\u7801\u5b57\u7b26\u4e32，\u89c4\u5219\u4e3a k[encoded_string]，\u8868\u793a\u65b9\u62ec\u53f7\u5185\u7684\u5b57\u7b26\u4e32\u91cd\u590d k \u6b21\u3002\u53ef\u5d4c\u5957\u3002\u8fd4\u56de\u89e3\u7801\u540e\u7684\u5b57\u7b26\u4e32\u3002
    \n\u4f8b\u5982：\u201c3[a2[c]]\u201d \u2192 \u201caccaccacc\u201d\u3002
    \n\u89e3\u6cd5\u4e00：\u53cc\u6808（\u63a8\u8350，\u6700\u76f4\u89c2）
    \n\u7528\u4e24\u4e2a\u6808\u5206\u522b\u4fdd\u5b58\u91cd\u590d\u6b21\u6570\u548c\u8fdb\u5165\u62ec\u53f7\u524d\u7684\u5df2\u62fc\u63a5\u5b57\u7b26\u4e32\u3002
    \n\u904d\u5386\u6bcf\u4e2a\u5b57\u7b26：
    \n\u5b57\u7b26 \u64cd\u4f5c
    \n\u6570\u5b57<\/p>\n","protected":false},"author":2,"featured_media":116010,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,2692,292,1813,427],"topic":[],"class_list":["post-116011","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-java","tag-leetcode","tag-292","tag-1813","tag-427"],"yoast_head":"\nDeepSeek LeetCode 394. \u5b57\u7b26\u4e32\u89e3\u7801 Java\u5b9e\u73b0 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/116011.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"DeepSeek LeetCode 394. \u5b57\u7b26\u4e32\u89e3\u7801 Java\u5b9e\u73b0 - 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