C语言数据结构树之后序遍历的实现

#include <iostream>
#include <string>
using namespace std;

string s1="abdec";//先序遍历
string s2="dbeac";//中序遍历

void calc(int l1,int r1,int l2,int r2){
  int m=s2.find(s1[l1]);
  //cout<<m<<endl;
  if(m>l2) calc(l1+1,l1+m-l2,l2,m-1);
  if(m<r2) calc(l1+m-l2+1,r1,m+1,r2);
  //cout<<s2[m]<<" ";
  cout<<s1[l1];
} 

int main(){
  
  calc(0,s1.length()-1,0,s2.length()-1); 
  cout<<endl;
  return 0;
}