Valid Anagram
<p>Given two strings <code>s</code> and <code>t</code>, return <code>true</code> if <code>t</code> is an <span data-keyword="anagram">anagram</span> of <code>s</code>, and <code>false</code> otherwise.</p>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>

<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">s = &quot;anagram&quot;, t = &quot;nagaram&quot;</span></p>

<p><strong>Output:</strong> <span class="example-io">true</span></p>
</div>

<p><strong class="example">Example 2:</strong></p>

<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">s = &quot;rat&quot;, t = &quot;car&quot;</span></p>

<p><strong>Output:</strong> <span class="example-io">false</span></p>
</div>

<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>1 &lt;= s.length, t.length &lt;= 5 * 10<sup>4</sup></code></li>
	<li><code>s</code> and <code>t</code> consist of lowercase English letters.</li>
</ul>

<p>&nbsp;</p>
<p><strong>Follow up:</strong> What if the inputs contain Unicode characters? How would you adapt your solution to such a case?</p>
Hash Table; String; Sorting
public class Solution {
    public bool IsAnagram(string s, string t) {
        if (s.Length != t.Length) {
            return false;
        }
        int[] cnt = new int[26];
        for (int i = 0; i < s.Length; ++i) {
            ++cnt[s[i] - 'a'];
            --cnt[t[i] - 'a'];
        }
        return cnt.All(x => x == 0);
    }
}
