Uva10701 Pre, in and post

 1 #include <iostream>
 2 #include <string>
 3 using namespace std;
 4 
 5 string pr,in;
 6 string postorder;
 7 void process(string preord,string inord);
 8 int main()
 9 {
10     int line,order;
11     //freopen("D:\\acm.txt","r",stdin);
12     cin>>line;
13     while(line--){
14         cin>>order;
15         cin>>pr>>in;
16         postorder.clear();
17         process(pr,in);
18         cout<<postorder<<endl;
19     }
20     return 0;
21 }
22 void process(string preord,string inord){
23     int Size = preord.size();
24     if(Size>0){
25         int p = inord.find(preord[0]);
26         process(preord.substr(1,p),inord.substr(0,p));//左树
27         process(preord.substr(p + 1,Size - (p + 1)),inord.substr(p + 1,Size - (p + 1)));//右树
28         postorder.push_back(preord[0]);
29     }
30 }