392. 判断子序列

func isSubsequence(s string, t string) bool {
    p1:=0
    p2:=0
    len1:=len(s)
    len2:=len(t)

    for p1<len1 &&  p2<len2{
        if s[p1] == t[p2] {
            p1++
            p2++
        }else {
            p2++
        }
    }

    return p1==len1
}