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g0301_0400.s0392_is_subsequence.readme.md Maven / Gradle / Ivy

392\. Is Subsequence

Easy

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.

**Follow up:** Suppose there are lots of incoming `s`, say s1, s2, ..., sk where k >= 109, and you want to check one by one to see if `t` has its subsequence. In this scenario, how would you change your code?