//target指代目标索引

//patten指代模板索引

 

#include<iostream>
#include<string>
 using namespace std;
 int match(const string& target,const string& pattern)
 {
     int target_length = target.size();
     int pattern_length = pattern.size();
     int target_index = 0;
     int pattern_index = 0;
     while(target_index < target_length && pattern_index < pattern_length)
     {
         if(target[target_index]==pattern[pattern_index])
         {
             ++target_index;
             ++pattern_index;
         }
         else
         {
             target_index -= (pattern_index-1);
             //target_index=target_index-patten_index+1 修改target_index 指代位置，并且指向下一位置

          pattern_index = 0;
         }
     }
     if(pattern_index == pattern_length)
     {
         return target_index - pattern_length; //修改位置，但不指向下一位置
     }
     else
     {
         return -1;
     }
 }
 int main()
 {
     cout<<match("banananobano","nano")<<endl;
     return 0;
 }