392.判断子序列

class Solution {
public:
    bool isSubsequence(string s, string t) {
        if(s.size() >t.size()){
            return false;
        }
        if(s.size()==0){
            return true;
        }
        int l=0,r=0;
        while(l<s.size() && r<t.size()){
            while(r<t.size() && s[l]!=t[r]){
                r++;
            }
            if(l<s.size() && r<t.size() && s[l]==t[r]){
                l++;
                r++;
            }
        }
        return l==s.size();
    }
};

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来源： https://www.cnblogs.com/wustjq/p/15705243.html