URL: https://leetcode.com/problems/is-subsequence/description/
Description:
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 <= 10^4
s and t consist only of lowercase English letters.
Follow up: Suppose there are lots of incoming s, say s1, s2, ..., sk where k
= 10^9, and you want to check one by one to see if t has its subsequence. In this scenario, how would you change your code?
Solution Code:
class Solution:
def isSubsequence(self, s: str, t: str) -> bool:
found = 0
x = 0
for i in s:
while x < len(t) and t[x] != i:
x += 1
if x < len(t):
x += 1
found += 1
else:
break
return found == len(s)