解题思路

贪心

基于前一相等字符的索引对比得出当前元素

public boolean isSubsequence(String s,String t){
        char[] chars = s.toCharArray();
        int index = -1;
        for(char temp:chars){
            index = t.indexOf(temp, index + 1);
            if(index == -1)
                return false;
        }
        return true;
    }