{"id":140,"date":"2021-01-03T15:47:00","date_gmt":"2021-01-03T15:47:00","guid":{"rendered":"https:\/\/imwarming.com\/?p=140"},"modified":"2021-01-03T15:47:00","modified_gmt":"2021-01-03T15:47:00","slug":"%e8%80%81%e4%bc%9a%e5%bf%98%e7%9a%84%e4%ba%8c%e5%8f%89%e6%a0%91%e9%81%8d%e5%8e%86%e5%bb%ba%e6%a0%91%e8%be%93%e5%87%ba","status":"publish","type":"post","link":"https:\/\/imwarming.com\/?p=140","title":{"rendered":"\u8001\u4f1a\u5fd8\u7684\u4e8c\u53c9\u6811\u904d\u5386\u5efa\u6811\u8f93\u51fa"},"content":{"rendered":"

\u524d\u4e2d\u8f93\u51fa\u540e<\/p>\n

\n
#include<iostream>  \nusing<\/span> namespace<\/span> std;  \n<\/span>int<\/span> pre[] = {1<\/span>, 2<\/span>, 3<\/span>, 4<\/span>, 5<\/span>, 6<\/span>};  \n<\/span>int<\/span> mid[] = {3<\/span>, 2<\/span>, 4<\/span>, 1<\/span>, 6<\/span>, 5<\/span>};  \n<\/span>void<\/span> post(int<\/span> root, int<\/span> start, int<\/span> end) \n{  \n    <\/span>if<\/span>(start > end)   \n        <\/span>return<\/span> ;  \n    <\/span>int<\/span> i = start;  \n    <\/span>while<\/span>(i < end && mid[i] != pre[root]) i++;  \/\/<\/span>\u5b9a\u4f4d\u6839\u5728\u4e2d\u5e8f\u7684\u4f4d\u7f6e<\/span>\n    post(root + 1<\/span>, start, i - 1<\/span>);  \/\/<\/span>\u9012\u5f52\u5904\u7406\u5de6\u5b50\u6811<\/span>\n    post(root + 1<\/span> + i - start, i + 1<\/span>, end);  \/\/<\/span>\u9012\u5f52\u5904\u7406\u53f3\u5b50\u6811\n    <\/span>\/\/<\/span>cout<<pre[root];  <\/span>\/\/<\/span>\u8bbf\u95ee\u5f53\u524d\u6811\u7684\u6839<\/span>\n    cout<<mid[i];\n}  \n\n<\/span>int<\/span> main() \n{  \n    post(<\/span>0<\/span>, 0<\/span>, 5<\/span>);  \n    <\/span>return<\/span> 0<\/span>;  \n} <\/span><\/pre>\n<\/div>\n
\u540e\u4e2d\u8f93\u51fa\u524d<\/p>\n
\n
#include<iostream>  \nusing<\/span> namespace<\/span> std;  \n<\/span>int<\/span> post[] = {3<\/span>, 4<\/span>, 2<\/span>, 6<\/span>, 5<\/span>, 1<\/span>};  \n<\/span>int<\/span> mid[] = {3<\/span>, 2<\/span>, 4<\/span>, 1<\/span>, 6<\/span>, 5<\/span>};  \n<\/span>void<\/span> pre(int<\/span> root, int<\/span> start, int<\/span> end) \n{  \n    <\/span>if<\/span>(start > end)   \n        <\/span>return<\/span> ;  \n    <\/span>int<\/span> i = start;  \n    <\/span>while<\/span>(i < end && mid[i] != post[root]) i++;  \/\/<\/span>\u5b9a\u4f4d\u6839\u5728\u4e2d\u5e8f\u7684\u4f4d\u7f6e<\/span>\n    cout<<mid[i];  \/\/<\/span>\u8bbf\u95ee\u5f53\u524d\u5904\u7406\u7684\u6811\u7684\u6839<\/span>\n    pre(root-1<\/span>-(end-i), start, i - 1<\/span>);  \/\/<\/span>\u9012\u5f52\u5904\u7406\u5de6\u5b50\u6811<\/span>\n    pre(root-1<\/span>, i + 1<\/span>, end);  \/\/<\/span>\u9012\u5f52\u5904\u7406\u53f3\u5b50\u6811  <\/span>\n}  \n\n<\/span>int<\/span> main()\n {  \n    pre(<\/span>5<\/span>, 0<\/span>, 5<\/span>);  \n    <\/span>return<\/span> 0<\/span>;  \n}<\/span><\/pre>\n<\/div>\n
\u5148\u4e2d\u5e8f\u5efa\u6811<\/p>\n
\n
treenode reconstructbinarytree(int<\/span>[] pre, int<\/span> prestart, int<\/span> preend, int<\/span>[] in<\/span>, int<\/span> instart, int<\/span> inend) {\n    <\/span>if<\/span> (prestart > preend || instart > inend) { \/\/<\/span>\u5230\u8fbe\u8fb9\u754c\u6761\u4ef6\u65f6\u8fd4\u56denull<\/span>\n        return<\/span> null<\/span>;\n    }\n    treenode treenode <\/span>= new<\/span> treenode(pre[prestart]);   \/\/<\/span>\u65b0\u5efa\u4e00\u4e2atreenode<\/span>\n\n    for<\/span> (int<\/span> i = instart; i <= inend; i++) {\n        <\/span>if<\/span> (in<\/span>[i] == pre[prestart]) {    \/\/<\/span>\u5728\u4e2d\u5e8f\u4e2d\u627e\u5230\u6839\u8282\u70b9\u7684\u4f4d\u7f6e\uff0c\u3010\u4f9d\u6b21\u3011\u5c06\u5148\u5e8f\u5e8f\u5217\u548c\u4e2d\u5e8f\u5e8f\u5217\u5206\u6210\u5de6\u53f3\u5b57\u6811\uff0c\u5206\u522b\u6784\u5efa\u5de6\u53f3\u5b50\u6811\u3002\n            <\/span>\/\/<\/span> \u91cd\u6784\u5de6\u5b50\u6811\uff0c\u6ce8\u610f\u8fb9\u754c\u6761\u4ef6<\/span>\n            treenode.left = reconstructbinarytree(pre, prestart + 1<\/span>, prestart + i - instart, in<\/span>, instart, i - 1<\/span>);\n            <\/span>\/\/<\/span> \u91cd\u6784\u53f3\u5b50\u6811\uff0c\u6ce8\u610f\u8fb9\u754c\u6761\u4ef6<\/span>\n            treenode.right = reconstructbinarytree(pre, prestart + i - instart + 1<\/span>, preend, in<\/span>, i + 1<\/span>, inend);\n        }\n    }\n    <\/span>return<\/span> treenode;\n}<\/span><\/pre>\n<\/div>\n
 <\/p>\n
\u540e\u4e2d\u5e8f\u5efa\u6811<\/p>\n
\n
treenode reconstructbinarytree2(int<\/span>[] in<\/span>, int<\/span> instart, int<\/span> inend, int<\/span>[] last, int<\/span> laststart, int<\/span> lastend) {\n    <\/span>if<\/span> (instart > inend || laststart > lastend)\n        <\/span>return<\/span> null<\/span>;\n    treenode treenode <\/span>= new<\/span> treenode(last[lastend]);\n    <\/span>for<\/span> (int<\/span> i = instart; i <= inend; i++) {\n        <\/span>if<\/span> (in<\/span>[i] == last[lastend]) {\n            treenode.left <\/span>= reconstructbinarytree2(in<\/span>, instart, i - 1<\/span>, last, laststart, laststart + i - instart - 1<\/span>);\n            treenode.right <\/span>= reconstructbinarytree2(in<\/span>, i + 1<\/span>, inend, last, laststart + i - instart, lastend - 1<\/span>);\n        }\n    }\n    <\/span>return<\/span> treenode;\n}<\/span><\/pre>\n<\/div>\n
 <\/p>\n
\u4e8c\u53c9\u641c\u7d22\u6811\u524d\u5e8f\u8f93\u51fa\u540e\u5e8f<\/p>\n
\n
vector<int<\/span>> v;\n<\/span>void<\/span> getpost(int<\/span> root, int<\/span> last) {\n    <\/span>int<\/span> i = root + 1<\/span>, j = last;\n    <\/span>while<\/span> (a[i] < a[root] && i <= last)i++;\/\/<\/span>\u627e\u5f53\u524d\u6839\u8282\u70b9\u5de6\u5b50\u8282\u70b9\u8fb9\u754c<\/span>\n    while<\/span> (a[j] >= a[root] && j > root)j--;\/\/<\/span>\u627e\u5f53\u524d\u6839\u8282\u70b9\u53f3\u5b50\u8282\u70b9\u8fb9\u754c<\/span>\n    if<\/span> (i - j != 1<\/span>)return<\/span>;\n    getpost(root <\/span>+ 1<\/span>, j);\/\/<\/span>\u904d\u5386\u5de6\u5b50\u8282\u70b9<\/span>\n    getpost(i, last);\/\/<\/span>\u904d\u5386\u53f3\u5b50\u8282\u70b9<\/span>\n    v.push_back(a[root]);\/\/<\/span>pb\u6839\u8282\u70b9(\u5de6\u53f3\u6839)<\/span>\n}<\/pre>\n<\/div>\n
*\u7ed9\u51fa\u4e8c\u53c9\u641c\u7d22\u6811\u7684\u4e00\u4e2a\u904d\u5386\uff0c\u53ea\u8981\u4ece\u5c0f\u5230\u5927\u6392\u5e8f\u5c31\u662f\u5176\u4e2d\u5e8f\u904d\u5386\uff0c\u6839\u636e\u4e2d\u5e8f\u904d\u5386\u4ece0\u4e0b\u6807\u5f00\u59cb\u5728\u8fdb\u884c\u5de6\u6839\u53f3\u904d\u5386\u5f97\u5230\u5c42\u5e8f\u904d\u5386 <\/p>\n
 <\/p>\n
\u4e8c\u53c9\u6811\u540e\u4e2d\u5e8f\u8f93\u51fa\u5c42\u5e8f<\/p>\n
\n
int<\/span> post[1005<\/span>], in<\/span>[1005<\/span>];\nmap<\/span><int<\/span>, int<\/span>> ma, le;\n<\/span>void<\/span> level(int<\/span> root, int<\/span> l, int<\/span> r, int<\/span> index) {\n    <\/span>if<\/span> (l > r)return<\/span>;\n    <\/span>int<\/span> p = ma[post[root]];\/\/<\/span>\u5f53\u524d\u540e\u5e8f\u6240\u5728\u6839\u8282\u70b9\u524d\u5e8f\u4f4d\u7f6e<\/span>\n    le[index] = post[root];\/\/<\/span>index\u4e3a\u8282\u70b9\u4e0b\u6807<\/span>\n    level(root - r + p - 1<\/span>, l, p - 1<\/span>, 2<\/span> * index);\/\/<\/span>root - (r - p) - 1\u662f\u5f53\u524d\u540e\u5e8f\u6839\u8282\u70b9\u4f4d\u7f6e\u51cf\u53bb(\u5176\u53f3\u5b50\u6811\u8282\u70b9\u4e2a\u6570)\u518d\u51cf\u4e00\u4f4d<\/span>\n    level(root - 1<\/span>, p + 1<\/span>, r, 2<\/span> * index + 1<\/span>);\n}\n\n<\/span>int<\/span> main() {\n    <\/span>int<\/span> n;\n    cin <\/span>>> n;\n    <\/span>for<\/span> (int<\/span> i = 1<\/span>; i <= n; i++) {\n        cin <\/span>>> post[i];\n    }\n    <\/span>for<\/span> (int<\/span> i = 1<\/span>; i <= n; i++) {\n        cin <\/span>>> in<\/span>[i];\n        ma[<\/span>in<\/span>[i]] = i;\n    }\n    level(n, <\/span>1<\/span>, n, 1<\/span>);\n}<\/span><\/pre>\n<\/div>\n
 <\/p>\n
 <\/div>\n
 <\/div>\n","protected":false},"excerpt":{"rendered":"
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