题解

双指针

#include <iostream>
#include <cstdio>
using namespace std;
int main(){
	string s1, s2;
	cin >> s1 >> s2;
	int ct = 0;
	for(int i = 0; s2[i] != '\0'; i++){
		if(s1[ct] == s2[i]) ct++;
	}
	if(s1[ct] == '\0') cout << "YES";
	else cout << "NO"; 

	return 0;
}