给定字符串 s 和 t ，判断 s 是否为 t 的子序列。
字符串的一个子序列是原始字符串删除一些（也可以不删除）字符而不改变剩余字符相对位置形成的新字符串。（例如，"ace"是"abcde"的一个子序列，而"aec"不是）。

Given two strings s and t, return true if s is a subsequence of t, or false otherwise.
A subsequence of a string is a new string that is formed from the original string by deleting some (can be none) of the characters without disturbing the relative positions of the remaining characters. (i.e., “ace” is a subsequence of “abcde” while “aec” is not).

解题思路

贪心想到了之后就很简单了

AC代码

class Solution:def isSubsequence(self, s: str, t: str) -> bool:if len(s) == 0:return Truesub_len = len(s)i = 0for char in t:if char == s[i]:i += 1if i == sub_len:return Truereturn True if i == sub_len else False