{"id":1478,"date":"2023-06-19T18:08:09","date_gmt":"2023-06-19T10:08:09","guid":{"rendered":"https:\/\/xinchewhd.com.cn\/?p=1478"},"modified":"2023-06-19T18:08:09","modified_gmt":"2023-06-19T10:08:09","slug":"%e3%80%90%e7%ae%97%e6%b3%95%e9%a2%98%e8%a7%a3%e3%80%9116-%e9%80%86%e6%b3%a2%e5%85%b0%e8%a1%a8%e8%be%be%e5%bc%8f%e5%90%8e%e7%bc%80%e8%a1%a8%e8%be%be%e5%bc%8f%e6%b1%82%e5%80%bc","status":"publish","type":"post","link":"https:\/\/xinchewhd.com.cn\/index.php\/%e7%ae%97%e6%b3%95\/%e3%80%90%e7%ae%97%e6%b3%95%e9%a2%98%e8%a7%a3%e3%80%9116-%e9%80%86%e6%b3%a2%e5%85%b0%e8%a1%a8%e8%be%be%e5%bc%8f%e5%90%8e%e7%bc%80%e8%a1%a8%e8%be%be%e5%bc%8f%e6%b1%82%e5%80%bc\/","title":{"rendered":"\u3010\u7b97\u6cd5\u9898\u89e3\u301116. \u9006\u6ce2\u5170\u8868\u8fbe\u5f0f(\u540e\u7f00\u8868\u8fbe\u5f0f)\u6c42\u503c"},"content":{"rendered":"
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\u8fd9\u662f\u4e00\u9053 \u4e2d\u7b49\u96be\u5ea6<\/span><\/strong> \u7684\u9898\u3002<\/span><\/p>\n<\/section>\n

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\u9898\u76ee\u6765\u81ea\uff1ahttps:\/\/leetcode.cn\/problems\/evaluate-reverse-polish-notation\/<\/p>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n


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\u9898\u76ee<\/span><\/strong><\/em><\/p>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n

\u7ed9\u4f60\u4e00\u4e2a\u5b57\u7b26\u4e32\u6570\u7ec4 tokens<\/span> \uff0c\u8868\u793a\u4e00\u4e2a\u6839\u636e \u9006\u6ce2\u5170\u8868\u793a\u6cd5<\/strong> \u8868\u793a\u7684\u7b97\u672f\u8868\u8fbe\u5f0f\u3002<\/p>\n


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\u8bf7\u4f60\u8ba1\u7b97\u8be5\u8868\u8fbe\u5f0f\u3002\u8fd4\u56de\u4e00\u4e2a\u8868\u793a\u8868\u8fbe\u5f0f\u503c\u7684\u6574\u6570\u3002<\/span><\/p>\n


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\u6ce8\u610f\uff1a<\/span><\/strong><\/p>\n

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    \u6709\u6548\u7684\u7b97\u7b26\u4e3a '<\/span>+<\/span>'\u3001'<\/span>-<\/span>'\u3001'<\/span>*<\/span>' \u548c '<\/span>\/<\/span>' \u3002<\/span><\/p>\n<\/li>\n

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    \u6bcf\u4e2a\u64cd\u4f5c\u6570\uff08\u8fd0\u7b97\u5bf9\u8c61\uff09\u90fd\u53ef\u4ee5\u662f\u4e00\u4e2a\u6574\u6570\u6216\u8005\u53e6\u4e00\u4e2a\u8868\u8fbe\u5f0f\u3002<\/span><\/p>\n<\/li>\n

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    \u4e24\u4e2a\u6574\u6570\u4e4b\u95f4\u7684\u9664\u6cd5\u603b\u662f \u5411\u96f6\u622a\u65ad<\/strong> \u3002<\/span><\/p>\n<\/li>\n

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    \u8868\u8fbe\u5f0f\u4e2d\u4e0d\u542b\u9664\u96f6\u8fd0\u7b97\u3002<\/span><\/p>\n<\/li>\n

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    \u8f93\u5165\u662f\u4e00\u4e2a\u6839\u636e\u9006\u6ce2\u5170\u8868\u793a\u6cd5\u8868\u793a\u7684\u7b97\u672f\u8868\u8fbe\u5f0f\u3002<\/span><\/p>\n<\/li>\n

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    \u7b54\u6848\u53ca\u6240\u6709\u4e2d\u95f4\u8ba1\u7b97\u7ed3\u679c\u53ef\u4ee5\u7528 32 \u4f4d<\/strong> \u6574\u6570\u8868\u793a\u3002<\/span><\/p>\n<\/li>\n<\/ul>\n


    <\/span><\/p>\n


    <\/span><\/p>\n

    \u793a\u4f8b1:<\/span><\/strong><\/section>\n
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    \u8f93\u5165\uff1atokens = [\"2\"<\/span>,\"1\"<\/span>,\"+\"<\/span>,\"3\"<\/span>,\"*\"<\/span>]
    \u8f93\u51fa\uff1a9<\/span>
    \u89e3\u91ca\uff1a\u8be5\u7b97\u5f0f\u8f6c\u5316\u4e3a\u5e38\u89c1\u7684\u4e2d\u7f00\u7b97\u672f\u8868\u8fbe\u5f0f\u4e3a\uff1a((2<\/span> + 1<\/span>) * 3<\/span>) = 9<\/span><\/code><\/pre>\n<\/section>\n

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    \u793a\u4f8b2:<\/strong><\/span><\/section>\n
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    \u8f93\u5165\uff1atokens = [\"4\"<\/span>,\"13\"<\/span>,\"5\"<\/span>,\"\/\"<\/span>,\"+\"<\/span>] 
    \u8f93\u51fa\uff1a6<\/span> 
    \u89e3\u91ca\uff1a\u8be5\u7b97\u5f0f\u8f6c\u5316\u4e3a\u5e38\u89c1\u7684\u4e2d\u7f00\u7b97\u672f\u8868\u8fbe\u5f0f\u4e3a\uff1a(4<\/span> + (13<\/span> \/ 5<\/span>)) = 6<\/span><\/code><\/pre>\n<\/section>\n

    <\/p>\n
    \u793a\u4f8b3:
    <\/strong><\/span><\/section>\n
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    \u8f93\u5165\uff1atokens = [\"10\"<\/span>,\"6\"<\/span>,\"9\"<\/span>,\"3\"<\/span>,\"+\"<\/span>,\"-11\"<\/span>,\"*\"<\/span>,\"\/\"<\/span>,\"*\"<\/span>,\"17\"<\/span>,\"+\"<\/span>,\"5\"<\/span>,\"+\"<\/span>]
    \u8f93\u51fa\uff1a22<\/span>
    \u89e3\u91ca\uff1a\u8be5\u7b97\u5f0f\u8f6c\u5316\u4e3a\u5e38\u89c1\u7684\u4e2d\u7f00\u7b97\u672f\u8868\u8fbe\u5f0f\u4e3a\uff1a
      ((10<\/span> * (6<\/span> \/ ((9<\/span> + 3<\/span>) * -11<\/span>))) + 17<\/span>) + 5<\/span>
    = ((10<\/span> * (6<\/span> \/ (12<\/span> * -11<\/span>))) + 17<\/span>) + 5<\/span>
    = ((10<\/span> * (6<\/span> \/ -132<\/span>)) + 17<\/span>) + 5<\/span>
    = ((10<\/span> * 0<\/span>) + 17<\/span>) + 5<\/span>
    = (0<\/span> + 17<\/span>) + 5<\/span>
    = 17<\/span> + 5<\/span>
    = 22<\/span><\/code><\/pre>\n<\/section>\n

    <\/strong><\/span><\/p>\n<\/section>\n
    \u63d0\u793a\uff1a<\/span><\/strong><\/span><\/p>\n
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      <\/path><\/g><\/path><\/path><\/g><\/path><\/g><\/path><\/g><\/path><\/g><\/path><\/g><\/path><\/g><\/path><\/g><\/path><\/g><\/path><\/g><\/path><\/g><\/path><\/g><\/path><\/g><\/path><\/g><\/path><\/g><\/path><\/path><\/g><\/path><\/path><\/g><\/path><\/g><\/g><\/g><\/g><\/svg><\/span><\/p>\n<\/section>\n<\/li>\n
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      tokens[i]<\/span> \u662f\u4e00\u4e2a\u7b97\u7b26\uff08\"<\/span>+<\/span>\"\u3001\"<\/span>-<\/span>\"\u3001\"<\/span>*<\/span>\" \u6216 \"<\/span>\/<\/span>\"\uff09\uff0c\u6216\u662f\u5728\u8303\u56f4 <\/span>[-200, 200]<\/span> \u5185\u7684\u4e00\u4e2a\u6574\u6570<\/span><\/p>\n<\/li>\n<\/ul>\n

      <\/section>\n
      \u9006\u6ce2\u5170\u8868\u8fbe\u5f0f\uff1a<\/span><\/strong><\/p>\n
      \u9006\u6ce2\u5170\u8868\u8fbe\u5f0f\u662f\u4e00\u79cd\u540e\u7f00\u8868\u8fbe\u5f0f\uff0c\u6240\u8c13\u540e\u7f00\u5c31\u662f\u6307\u7b97\u7b26\u5199\u5728\u540e\u9762\u3002<\/span><\/p>\n
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        \u5e73\u5e38\u4f7f\u7528\u7684\u7b97\u5f0f\u5219\u662f\u4e00\u79cd\u4e2d\u7f00\u8868\u8fbe\u5f0f\uff0c<\/span>\u5982 <\/span>( 1 + 2 ) * ( 3 + 4 )<\/span> \u3002<\/span><\/p>\n<\/li>\n
      • \n
        \u8be5\u7b97\u5f0f\u7684\u9006\u6ce2\u5170\u8868\u8fbe\u5f0f\u5199\u6cd5\u4e3a <\/span>( ( 1 2 + ) ( 3 4 + ) * )<\/span> \u3002<\/span><\/p>\n<\/li>\n<\/ul>\n

        <\/p>\n
        \u9006\u6ce2\u5170\u8868\u8fbe\u5f0f\u4e3b\u8981\u6709\u4ee5\u4e0b\u4e24\u4e2a\u4f18\u70b9\uff1a<\/span><\/strong><\/span><\/p>\n
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          \u53bb\u6389\u62ec\u53f7\u540e\u8868\u8fbe\u5f0f\u65e0\u6b67\u4e49\uff0c\u4e0a\u5f0f\u5373\u4fbf\u5199\u6210 <\/span>1 2 + 3 4 + *<\/span> \u4e5f\u53ef\u4ee5\u4f9d\u636e\u6b21\u5e8f\u8ba1\u7b97\u51fa\u6b63\u786e\u7ed3\u679c\u3002<\/span><\/p>\n<\/li>\n
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          \u9002\u5408\u7528\u6808\u64cd\u4f5c\u8fd0\u7b97\uff1a\u9047\u5230\u6570\u5b57\u5219\u5165\u6808\uff1b\u9047\u5230\u7b97\u7b26\u5219\u53d6\u51fa\u6808\u9876\u4e24\u4e2a\u6570\u5b57\u8fdb\u884c\u8ba1\u7b97\uff0c\u5e76\u5c06\u7ed3\u679c\u538b\u5165\u6808\u4e2d<\/span><\/p>\n<\/li>\n<\/ul>\n
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