挨个儿对着比就行，暴力。

#include <iostream>
#include <string>

using namespace std;

int main()
{
    string a, b;
    while (cin>>a>>b) {
        unsigned long i, j, len1, len2;
        len1 = a.length();
        len2 = b.length();
        i = j = 0;
        while (true) {
            if (i == len1) {
                cout << "Yes" << endl;
                break;
            }
            else if (i < len1 && j == len2)
            {
                cout << "No" << endl;
                break;
            }
            if (a[i] == b[j]) {
                i++;j++;
            }
            else j++;
        }
    }
    return 0;
}

poj1936