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| 1 | +<h2><a href="https://leetcode.com/problems/interleaving-string/">97. Interleaving String</a></h2><h3>Medium</h3><hr><div><p>Given strings <code>s1</code>, <code>s2</code>, and <code>s3</code>, find whether <code>s3</code> is formed by an <strong>interleaving</strong> of <code>s1</code> and <code>s2</code>.</p> |
| 2 | + |
| 3 | +<p>An <strong>interleaving</strong> of two strings <code>s</code> and <code>t</code> is a configuration where they are divided into <strong>non-empty</strong> substrings such that:</p> |
| 4 | + |
| 5 | +<ul> |
| 6 | + <li><code>s = s<sub>1</sub> + s<sub>2</sub> + ... + s<sub>n</sub></code></li> |
| 7 | + <li><code>t = t<sub>1</sub> + t<sub>2</sub> + ... + t<sub>m</sub></code></li> |
| 8 | + <li><code>|n - m| <= 1</code></li> |
| 9 | + <li>The <strong>interleaving</strong> is <code>s<sub>1</sub> + t<sub>1</sub> + s<sub>2</sub> + t<sub>2</sub> + s<sub>3</sub> + t<sub>3</sub> + ...</code> or <code>t<sub>1</sub> + s<sub>1</sub> + t<sub>2</sub> + s<sub>2</sub> + t<sub>3</sub> + s<sub>3</sub> + ...</code></li> |
| 10 | +</ul> |
| 11 | + |
| 12 | +<p><strong>Note:</strong> <code>a + b</code> is the concatenation of strings <code>a</code> and <code>b</code>.</p> |
| 13 | + |
| 14 | +<p> </p> |
| 15 | +<p><strong>Example 1:</strong></p> |
| 16 | +<img alt="" src="https://assets.leetcode.com/uploads/2020/09/02/interleave.jpg" style="width: 561px; height: 203px;"> |
| 17 | +<pre><strong>Input:</strong> s1 = "aabcc", s2 = "dbbca", s3 = "aadbbcbcac" |
| 18 | +<strong>Output:</strong> true |
| 19 | +</pre> |
| 20 | + |
| 21 | +<p><strong>Example 2:</strong></p> |
| 22 | + |
| 23 | +<pre><strong>Input:</strong> s1 = "aabcc", s2 = "dbbca", s3 = "aadbbbaccc" |
| 24 | +<strong>Output:</strong> false |
| 25 | +</pre> |
| 26 | + |
| 27 | +<p><strong>Example 3:</strong></p> |
| 28 | + |
| 29 | +<pre><strong>Input:</strong> s1 = "", s2 = "", s3 = "" |
| 30 | +<strong>Output:</strong> true |
| 31 | +</pre> |
| 32 | + |
| 33 | +<p> </p> |
| 34 | +<p><strong>Constraints:</strong></p> |
| 35 | + |
| 36 | +<ul> |
| 37 | + <li><code>0 <= s1.length, s2.length <= 100</code></li> |
| 38 | + <li><code>0 <= s3.length <= 200</code></li> |
| 39 | + <li><code>s1</code>, <code>s2</code>, and <code>s3</code> consist of lowercase English letters.</li> |
| 40 | +</ul> |
| 41 | + |
| 42 | +<p> </p> |
| 43 | +<p><strong>Follow up:</strong> Could you solve it using only <code>O(s2.length)</code> additional memory space?</p> |
| 44 | +</div> |
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