issubstring.cpp

给定两个字符串str1与str2

#include<iostream>   
#include<fstream>    
using namespace std;   
ifstream fin("input.txt");
ofstream fout("output.txt");
#define cin fin
#define cout fout  
  
bool IsSubString(char str1[],char str2[]){
	int i=0,j=0,len1,len2;
	len1=strlen(str1);
	len2=strlen(str2);
	if(len1>len2)
		return false;
	else{
		for(i=0;i<len1;i++){
			while(str1[i]!=str2[j]&&j<len2){
				j++;
			}
			if(j>=len2)
				break;
		}
		if(i<len1)
			return false;
		else 
			return true;
	}
}
int main()   
{   
    char str1[80],str2[80];
	
    while(cin>>str1>>str2){
		if (IsSubString(str1,str2))
			cout<<"Yes"<<endl;
		else
			cout<<"No"<<endl;
	}
    return 0;   
}