392. 判断子序列

class Solution 
{
public:
    bool isSubsequence(string s, string t) 
    {
        int n = s.size();
        int i = 0;
        for(int j = 0;j < t.size();j ++)
        {
            if(s[i] == t[j]) i++;
        }
        return i == n;
    }
};