problem0392

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Published: Jul 25, 2019 License: MIT Imports: 0 Imported by: 0

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392. Is Subsequence

题目

Given a string s and a string t, check if s is subsequence of t.

You may assume that there is only lower case English letters in both s and t. t is potentially a very long (length ~= 500,000) string, and s is a short string (<=100).

A subsequence of a string is a new string which is formed from the original string by deleting some (can be none) of the characters without disturbing the relative positions of the remaining characters. (ie, "ace" is a subsequence of "abcde" while "aec" is not).

Example 1:

s = "abc", t = "ahbgdc"
Return true.

Example 2:

s = "axc", t = "ahbgdc"
Return false.

Follow up: If there are lots of incoming S, say S1, S2, ... , Sk where k >= 1B, and you want to check one by one to see if T has its subsequence. In this scenario, how would you change your code?

Credits:Special thanks to @pbrother for adding this problem and creating all test cases.

解题思路

见程序注释

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