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).
Example 1:
Input: s = "abc", t = "ahbgdc"
Output: true
Example 2:
Input: s = "axc", t = "ahbgdc"
Output: false
Solution
class Solution:
def isSubsequence(self, s: str, t: str) -> bool:
s_pointer = t_pointer = 0
while len(s) > s_pointer and len(t) > t_pointer:
if s[s_pointer] == t[t_pointer]:
s_pointer += 1
t_pointer += 1
else:
t_pointer += 1
if s_pointer == len(s):
return True
return False