UVA548 tree (traversal of binary trees)

Source: Internet
Author: User

Determine the value of the leaf node in a given binary tree that's the terminal node of a

Path of least value from the root of the binary tree to any leaf. The value of a path is the sum of values

of nodes along that path.


The input file would contain a description of the binary tree given as the inorder and Postorder traversal

sequences of that tree. Your program would read the until end of file from the input file. The first

Line would contain the sequence of values associated with an inorder traversal of the tree and the second

Line would contain the sequence of values associated with a postorder traversal of the tree. All values

'll is different, greater than zero and less than 10000. Assume that no binary tree would have

More than 10000 nodes or less than 1 node.


For each tree description you should output the value of the leaf node of a path of least value. In the

Case of multiple paths of least value A should pick the one with the least value on the terminal node.

Sample Input

3 2 1 4 5 7 6

3 1 2 5 6 7 4

7 8 11 3 5 16 12 18

8 3 11 7 16 18 12 5



Sample Output




"Analysis" well began to learn the binary tree, the feeling is very difficult, this code is not very understand, it feels like the first through the middle sequence traversal, order traversal to find the sequence traversal, found sub-leaf point sum.

#include <iostream>#include<cstdio>#include<cstdlib>#include<cmath>#include<algorithm>#include<climits>#include<cstring>#include<string>#include<Set>#include<map>#include<queue>#include<stack>#include<vector>#include<list>#include<functional>#defineMoD 1000000007#defineINF 0x3f3f3f3f#definePi ACOs (-1.0)using namespaceStd;typedefLong Longll;Const intn= -;Const intm=15005;Chars[100005];intv1[100005],v2[100005],top;intMin_sum,ans;intInitChar*s,int*v) {inttop=0;  for(intI=0; T[n]; i++) {         while(s[i]==' ') I++; V[top]=0;  while(s[i]&&isdigit (S[i])) {V[top]=v[top]*Ten+s[i]-'0'; I++; } Top++; if(!s[i]) Break; }    returntop;}intFindint*v,intNintc) { for(inti=n-1; i>=0; i--)        if(v[i]==c)returni; return 0;}voidBuildintNint*V1,int*v2,intsum) {    if(n<=0)        return ; intP=find (v1,n,v2[n-1]); //printf ("v2[n-1]=%d p=%d\n", v2[n-1],p);sum+=v2[n-1]; if(p<=0&&n-p-1<=0) {        if(sum==min_sum) ans=min (ans,v2[n-1]); Else if(sum<min_sum) {Min_sum=sum; Ans=v2[n-1]; }        return ;    } build (P,v1,v2,sum); Build (n-p-1, v1+p+1, v2+p,sum);}intMain () { while(gets (s)) {intv;        Init (S,V1);        Gets (s); Top=init (S,V2); Ans=min_sum=10000000; Build (Top,v1,v2,0); printf ("%d\n", ans); }    return 0;}
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UVA548 tree (traversal of binary trees)

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