学步园

水………………………………………………………………………………过，只不过是加个判断和模板无分别

#include<iostream>
#include<string>
#include<vector>

using namespace std;

string a,b;

string Lcs(){
	vector<int> s(a.size(),0);
	string::size_type i = 1,j = 1;
	int flag = s[0]; int flag2 = s[0];
	while(j < b.size()){
		for(i = 1;i < a.size();i++){
			int temp = s[i];
			if(a[i] == b[j])
				s[i] = flag2+1;
			else{
				s[i] = flag > s[i]? flag:s[i];
			}
			flag2 = temp;
			flag = s[i];
		}
		j++;
		flag = flag2 = s[0];
	}
	if(s[a.size()-1] == a.size()-1)
		return "Yes";
	else
		return "No";
}

int main()
{
	while(cin >>a >>b){
		a = " "+a; b = " "+b;
		cout <<Lcs() <<endl;
	}
	return 0;
}