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"title": "Minimum Possible Integer After at Most K Adjacent Swaps On Digits",
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"content": "<p>You are given a string <code>num</code> representing <strong>the digits</strong> of a very large integer and an integer <code>k</code>. You are allowed to swap any two adjacent digits of the integer <strong>at most</strong> <code>k</code> times.</p>\n\n<p>Return <em>the minimum integer you can obtain also as a string</em>.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/06/17/q4_1.jpg\" style=\"width: 500px; height: 40px;\" />\n<pre>\n<strong>Input:</strong> num = "4321", k = 4\n<strong>Output:</strong> "1342"\n<strong>Explanation:</strong> The steps to obtain the minimum integer from 4321 with 4 adjacent swaps are shown.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> num = "100", k = 1\n<strong>Output:</strong> "010"\n<strong>Explanation:</strong> It's ok for the output to have leading zeros, but the input is guaranteed not to have any leading zeros.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> num = "36789", k = 1000\n<strong>Output:</strong> "36789"\n<strong>Explanation:</strong> We can keep the number without any swaps.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= num.length <= 3 * 10<sup>4</sup></code></li>\n\t<li><code>num</code> consists of only <strong>digits</strong> and does not contain <strong>leading zeros</strong>.</li>\n\t<li><code>1 <= k <= 10<sup>4</sup></code></li>\n</ul>\n",
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"For each index i, check the smallest digit in a window of size k and append it to the answer. Update the indices of all digits in this range accordingly."
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