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Java-based LeetCode algorithm problem solutions, regularly updated

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44\. Wildcard Matching

Hard

Given an input string (`s`) and a pattern (`p`), implement wildcard pattern matching with support for `'?'` and `'*'` where:

*   `'?'` Matches any single character.
*   `'*'` Matches any sequence of characters (including the empty sequence).

The matching should cover the **entire** input string (not partial).

**Example 1:**

**Input:** s = "aa", p = "a"

**Output:** false

**Explanation:** "a" does not match the entire string "aa". 

**Example 2:**

**Input:** s = "aa", p = "\*"

**Output:** true

**Explanation:** '\*' matches any sequence. 

**Example 3:**

**Input:** s = "cb", p = "?a"

**Output:** false

**Explanation:** '?' matches 'c', but the second letter is 'a', which does not match 'b'. 

**Example 4:**

**Input:** s = "adceb", p = "\*a\*b"

**Output:** true

**Explanation:** The first '\*' matches the empty sequence, while the second '\*' matches the substring "dce". 

**Example 5:**

**Input:** s = "acdcb", p = "a\*c?b"

**Output:** false 

**Constraints:**

*   `0 <= s.length, p.length <= 2000`
*   `s` contains only lowercase English letters.
*   `p` contains only lowercase English letters, `'?'` or `'*'`.