入栈顺序为先序遍历,出栈顺序为中序遍历. #include<cstdio> #include<cstring> #include<cmath> #include<algorithm> #include<stack> using namespace std; +; const int INF=0x7FFFFFFF; int n,tot; int Preorder[maxn],Inorder[maxn],Postorder[maxn]; int AP…

递归建树,然后BFS一下 #include<iostream> #include<cstring> #include<cmath> #include<algorithm> #include<cstdio> #include<queue> #include<vector> using namespace std; ; int a[maxn],b[maxn]; int n,tot; struct Node { int left…

题意:输入一个正整数N(<=30),接着输入2*N行表示栈的出入(入栈顺序表示了二叉搜索树的先序序列,出栈顺序表示了二叉搜索树的中序序列),输出后序序列. AAAAAccepted code: #define HAVE_STRUCT_TIMESPEC #include<bits/stdc++.h> using namespace std; stack<int>st; ],b[]; ]; void build(int n,int*a,int*b,int*ans){ if(!n)…

1086 Tree Traversals Again (25分)   An inorder binary tree traversal can be implemented in a non-recursive way with a stack. For example, suppose that when a 6-node binary tree (with the keys numbered from 1 to 6) is traversed, the stack operations ar…

Tree Traversals Suppose that all the keys in a binary tree are distinct positive integers. Given the postorder and inorder traversal sequences, you are supposed to output the level order traversal sequence of the corresponding binary tree. Input Spec…

题目 An inorder binary tree traversal can be implemented in a non-recursive way with a stack. For example, suppose that when a 6-node binary tree (with the keys numbered from 1 to 6) is traversed, the stack operations are: push(1); push(2); push(3); po…

题目如下: An inorder binary tree traversal can be implemented in a non-recursive way with a stack. For example, suppose that when a 6-node binary tree (with the keys numbered from 1 to 6) is traversed, the stack operations are: push(1); push(2); push(3);…

简单题. #include<cstdio> #include<cstring> #include<cmath> #include<vector> #include<map> #include<queue> #include<stack> #include<algorithm> using namespace std; +]; ,sum2; int n; int main() { scanf("%d&q…

简单DFS. #include<cstdio> #include<cstring> #include<cmath> #include<algorithm> #include<map> #include<queue> #include<stack> #include<vector> using namespace std; ; int n,m; vector<int>g[maxn]; int ans[…

简单题. #include<cstdio> #include<cstring> #include<cmath> #include<vector> #include<map> #include<stack> #include<queue> #include<string> #include<algorithm> using namespace std; +; struct Node { ]; ]; ]…