392. Is Subsequence

 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

 

Constraints:

• 0 <= s.length <= 100
• 0 <= t.length <= 104
• s and t consist only of lowercase English letters.

Solution :

	class Solution(object):
	def isSubsequence(self, s, t):
	"""
	:type s: str
	:type t: str
	:rtype: bool
	"""
	sb,tb=len(s),len(t)
	i,j=0,0
	while i<sb and j<tb:
	if s[i]==t[j]:
	i+=1
	j+=1
	return i==sb

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