{"id":731,"date":"2020-06-29T00:08:19","date_gmt":"2020-06-28T16:08:19","guid":{"rendered":"http:\/\/www.guanhaobo.cn\/?p=731"},"modified":"2020-06-29T00:08:19","modified_gmt":"2020-06-28T16:08:19","slug":"731","status":"publish","type":"post","link":"https:\/\/www.guanhaobo.cn\/?p=731","title":{"rendered":"JZ21 \u2014 \u6808\u7684\u538b\u5165\u3001\u5f39\u51fa\u5e8f\u5217"},"content":{"rendered":"

0 \u9898\u76ee\u63cf\u8ff0<\/h3>\n

\u8f93\u5165\u4e24\u4e2a\u6574\u6570\u5e8f\u5217\uff0c\u7b2c\u4e00\u4e2a\u5e8f\u5217\u8868\u793a\u6808\u7684\u538b\u5165\u987a\u5e8f\uff0c\u8bf7\u5224\u65ad\u7b2c\u4e8c\u4e2a\u5e8f\u5217\u662f\u5426\u53ef\u80fd\u4e3a\u8be5\u6808\u7684\u5f39\u51fa\u987a\u5e8f\u3002\u5047\u8bbe\u538b\u5165\u6808\u7684\u6240\u6709\u6570\u5b57\u5747\u4e0d\u76f8\u7b49\u3002\u4f8b\u5982\u5e8f\u52171,2,3,4,5\u662f\u67d0\u6808\u7684\u538b\u5165\u987a\u5e8f\uff0c\u5e8f\u52174,5,3,2,1\u662f\u8be5\u538b\u6808\u5e8f\u5217\u5bf9\u5e94\u7684\u4e00\u4e2a\u5f39\u51fa\u5e8f\u5217\uff0c\u4f464,3,5,1,2\u5c31\u4e0d\u53ef\u80fd\u662f\u8be5\u538b\u6808\u5e8f\u5217\u7684\u5f39\u51fa\u5e8f\u5217\u3002\uff08\u6ce8\u610f\uff1a\u8fd9\u4e24\u4e2a\u5e8f\u5217\u7684\u957f\u5ea6\u662f\u76f8\u7b49\u7684\uff09<\/p>\n

1 \u9898\u76ee\u5206\u6790<\/h3>\n

\u9898\u76ee\u4e2d\u8bf4\u538b\u5165\u6808\u7684\u6240\u6709\u6570\u5b57\u5747\u4e0d\u76f8\u7b49<\/code>\uff0c\u90a3\u4e48\u6211\u4eec\u53ea\u9700\u8981\u6a21\u62df\u4e00\u4e0b\uff1a\u5982\u679c\u6808\u9876\u548c\u5f39\u51fa\u5e8f\u5217\u7684\u9876\u90e8\u76f8\u7b49\u5219\u5f39\u51fa\uff0c\u5426\u5219\u6dfb\u52a0\u6570\u5b57\u3002\u6700\u540e\u5982\u679c\u6808\u4e3a\u7a7a\uff0c\u5219\u7b26\u5408\u8981\u6c42\u3002
\n\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(n)<\/code><\/p>\n

1.1 C++<\/h5>\n
class Solution\n{\npublic:\n    bool IsPopOrder(vector<int> pushV, vector<int> popV)\n    {\n        stack<int> s;\n        int i = 0, j = 0;\n        while (1)\n        {\n            if (!s.empty() && s.top() == popV[j])\n            {\n                s.pop();\n                j++;\n            }\n            else\n            {\n                if (i == pushV.size())\n                    break;\n                s.push(pushV[i++]);\n            }\n        }\n        return s.empty();\n    }\n};\n<\/code><\/pre>\n
1.2 Java<\/h5>\n
import java.util.*;\n\npublic class Solution {\n    public boolean IsPopOrder(int[] pushA, int[] popA) {\n        Stack<Integer> s = new Stack<>();\n        int i = 0, j = 0;\n        while (true) {\n            if (!s.empty() && s.peek() == popA[j]) {\n                s.pop();\n                j++;\n            } else {\n                if (i == pushA.length)\n                    break;\n                s.push(pushA[i++]);\n            }\n        }\n        return s.empty();\n    }\n}\n<\/code><\/pre>\n
2 \u62d3\u5c55<\/h3>\n
\u5982\u679c\u6808\u4e2d\u6570\u5b57\u6709\u53ef\u80fd\u91cd\u590d\uff0c\u90a3\u4e48\u4f7f\u7528\u4e0a\u9762\u7684\u89e3\u6cd5\u5c31\u4e0d\u884c\u4e86\u3002
\n\u6211\u4eec\u53ef\u4ee5\u8fdb\u884c\u6df1\u5ea6\u4f18\u5148\u641c\u7d22\uff08\u5176\u5b9e\u5c31\u662f\u679a\u4e3e\u51fa\u6240\u6709\u60c5\u51b5\uff09\uff0c\u6bcf\u6b21\u53ef\u4ee5\u6709\u4e24\u79cd\u64cd\u4f5c\uff1a
\n1. \u5982\u679c\u6808\u9876\u6570\u5b57\u548c\u5f39\u51fa\u5e8f\u5217\u7684\u9876\u90e8\u76f8\u540c\uff0c\u53ef\u4ee5\u8fdb\u884c\u5f39\u51fa\u3002
\n2. \u5982\u679c\u538b\u5165\u5e8f\u5217\u4e0d\u4e3a\u7a7a\uff0c\u53ef\u4ee5\u5c06\u6570\u5b57\u538b\u5165\u6808\u4e2d\u3002<\/p>\n
\u4e24\u79cd\u64cd\u4f5c\u540e\u90fd\u8981\u8fdb\u884c\u9012\u5f52\uff0c\u6700\u540e\u6709\u81f3\u5c11\u4e00\u79cd\u8fd4\u56de\u771f\uff0c\u5219\u4e3a\u771f\u3002
\n\u6bcf\u6b21\u6709\u4e24\u79cd\u9009\u62e9\uff0c\u6240\u4ee5\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(2^n)<\/code><\/p>\n
2.1 C++<\/h5>\n
class Solution\n{\npublic:\n    bool IsPopOrder(vector<int> pushV, vector<int> popV)\n    {\n        stack<int> s, pushS, popS;\n        for (int i = pushV.size() - 1; i >= 0; i--)\n            pushS.push(pushV[i]);\n        for (int i = popV.size() - 1; i >= 0; i--)\n            popS.push(popV[i]);\n        return dfs(s, pushS, popS);\n    }\n\nprivate:\n    bool dfs(stack<int> s, stack<int> pushS, stack<int> popS)\n    {\n        if (s.empty() && pushS.empty() && popS.empty())\n            return true;\n        bool ans1 = false, ans2 = false;\n        \/\/\u5220\u9664\u5143\u7d20\n        if (!s.empty() && s.top() == popS.top())\n        {\n            int temp = s.top();\n            s.pop();\n            popS.pop();\n            ans1 = dfs(s, pushS, popS);\n            s.push(temp);\n            popS.push(temp);\n        }\n\n        \/\/\u6dfb\u52a0\u5143\u7d20\n        if (!pushS.empty())\n        {\n            s.push(pushS.top());\n            pushS.pop();\n            ans2 = dfs(s, pushS, popS);\n        }\n        return ans1 || ans2;\n    }\n};\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
0 \u9898\u76ee\u63cf\u8ff0 \u8f93\u5165\u4e24\u4e2a\u6574\u6570\u5e8f\u5217\uff0c\u7b2c\u4e00\u4e2a\u5e8f\u5217\u8868\u793a\u6808\u7684\u538b\u5165\u987a\u5e8f\uff0c\u8bf7\u5224\u65ad\u7b2c\u4e8c\u4e2a\u5e8f\u5217\u662f\u5426\u53ef\u80fd\u4e3a\u8be5\u6808\u7684\u5f39\u51fa\u987a\u5e8f\u3002\u5047\u8bbe\u538b\u5165 […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[39],"class_list":["post-731","post","type-post","status-publish","format-standard","hentry","category-algo","tag-offer"],"_links":{"self":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/731","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=731"}],"version-history":[{"count":0,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=\/wp\/v2\/posts\/731\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=731"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=731"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.guanhaobo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=731"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}