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+<h2><a href="https://leetcode.com/problems/remove-k-digits/">402. Remove K Digits</a></h2><h3>Medium</h3><hr><div><p>Given string num representing a non-negative integer <code>num</code>, and an integer <code>k</code>, return <em>the smallest possible integer after removing</em> <code>k</code> <em>digits from</em> <code>num</code>.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre><strong>Input:</strong> num = "1432219", k = 3
+<strong>Output:</strong> "1219"
+<strong>Explanation:</strong> Remove the three digits 4, 3, and 2 to form the new number 1219 which is the smallest.
+</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<pre><strong>Input:</strong> num = "10200", k = 1
+<strong>Output:</strong> "200"
+<strong>Explanation:</strong> Remove the leading 1 and the number is 200. Note that the output must not contain leading zeroes.
+</pre>
+
+<p><strong>Example 3:</strong></p>
+
+<pre><strong>Input:</strong> num = "10", k = 2
+<strong>Output:</strong> "0"
+<strong>Explanation:</strong> Remove all the digits from the number and it is left with nothing which is 0.
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= k &lt;= num.length &lt;= 10<sup>5</sup></code></li>
+	<li><code>num</code> consists of only digits.</li>
+	<li><code>num</code> does not have any leading zeros except for the zero itself.</li>
+</ul>
+</div>