#include<iostream>using namespace std;int BFMatch(char* s,char* p){    int i=0;    int j=0;    while(i<strlen(s))    {                while(s[i]==p[j]&&j<strlen(p))        {            j++;            i++;        }        if(j==strlen(p))          return i-strlen(p);         i=i-j+1;    }    return -1;}int main(){    char* s="123a";    char* p="a";    cout<<BFMatch(s,p)<<endl;    getchar();}