mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-10 18:48:13 +08:00
51 lines
2.3 KiB
HTML
51 lines
2.3 KiB
HTML
<p>You are given a string <code>num</code>, which represents a large integer. You are also given a <strong>0-indexed</strong> integer array <code>change</code> of length <code>10</code> that maps each digit <code>0-9</code> to another digit. More formally, digit <code>d</code> maps to digit <code>change[d]</code>.</p>
|
|
|
|
<p>You may <strong>choose</strong> to <b>mutate a single substring</b> of <code>num</code>. To mutate a substring, replace each digit <code>num[i]</code> with the digit it maps to in <code>change</code> (i.e. replace <code>num[i]</code> with <code>change[num[i]]</code>).</p>
|
|
|
|
<p>Return <em>a string representing the <strong>largest</strong> possible integer after <strong>mutating</strong> (or choosing not to) a <strong>single substring</strong> of </em><code>num</code>.</p>
|
|
|
|
<p>A <strong>substring</strong> is a contiguous sequence of characters within the string.</p>
|
|
|
|
<p> </p>
|
|
<p><strong class="example">Example 1:</strong></p>
|
|
|
|
<pre>
|
|
<strong>Input:</strong> num = "<u>1</u>32", change = [9,8,5,0,3,6,4,2,6,8]
|
|
<strong>Output:</strong> "<u>8</u>32"
|
|
<strong>Explanation:</strong> Replace the substring "1":
|
|
- 1 maps to change[1] = 8.
|
|
Thus, "<u>1</u>32" becomes "<u>8</u>32".
|
|
"832" is the largest number that can be created, so return it.
|
|
</pre>
|
|
|
|
<p><strong class="example">Example 2:</strong></p>
|
|
|
|
<pre>
|
|
<strong>Input:</strong> num = "<u>021</u>", change = [9,4,3,5,7,2,1,9,0,6]
|
|
<strong>Output:</strong> "<u>934</u>"
|
|
<strong>Explanation:</strong> Replace the substring "021":
|
|
- 0 maps to change[0] = 9.
|
|
- 2 maps to change[2] = 3.
|
|
- 1 maps to change[1] = 4.
|
|
Thus, "<u>021</u>" becomes "<u>934</u>".
|
|
"934" is the largest number that can be created, so return it.
|
|
</pre>
|
|
|
|
<p><strong class="example">Example 3:</strong></p>
|
|
|
|
<pre>
|
|
<strong>Input:</strong> num = "5", change = [1,4,7,5,3,2,5,6,9,4]
|
|
<strong>Output:</strong> "5"
|
|
<strong>Explanation:</strong> "5" is already the largest number that can be created, so return it.
|
|
</pre>
|
|
|
|
<p> </p>
|
|
<p><strong>Constraints:</strong></p>
|
|
|
|
<ul>
|
|
<li><code>1 <= num.length <= 10<sup>5</sup></code></li>
|
|
<li><code>num</code> consists of only digits <code>0-9</code>.</li>
|
|
<li><code>change.length == 10</code></li>
|
|
<li><code>0 <= change[d] <= 9</code></li>
|
|
</ul>
|