mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-11-04 03:33:12 +08:00
72 lines
3.5 KiB
HTML
72 lines
3.5 KiB
HTML
<p>You are given a <strong>0-indexed</strong> integer array <code>nums</code>.</p>
|
||
|
||
<p>The <strong>concatenation</strong> of two numbers is the number formed by concatenating their numerals.</p>
|
||
|
||
<ul>
|
||
<li>For example, the concatenation of <code>15</code>, <code>49</code> is <code>1549</code>.</li>
|
||
</ul>
|
||
|
||
<p>The <strong>concatenation value</strong> of <code>nums</code> is initially equal to <code>0</code>. Perform this operation until <code>nums</code> becomes empty:</p>
|
||
|
||
<ul>
|
||
<li>If there exists more than one number in <code>nums</code>, pick the first element and last element in <code>nums</code> respectively and add the value of their concatenation to the <strong>concatenation value</strong> of <code>nums</code>, then delete the first and last element from <code>nums</code>.</li>
|
||
<li>If one element exists, add its value to the <strong>concatenation value</strong> of <code>nums</code>, then delete it.</li>
|
||
</ul>
|
||
|
||
<p>Return<em> the concatenation value of the <code>nums</code></em>.</p>
|
||
|
||
<p> </p>
|
||
<p><strong class="example">Example 1:</strong></p>
|
||
|
||
<pre>
|
||
<strong>Input:</strong> nums = [7,52,2,4]
|
||
<strong>Output:</strong> 596
|
||
<strong>Explanation:</strong> Before performing any operation, nums is [7,52,2,4] and concatenation value is 0.
|
||
- In the first operation:
|
||
We pick the first element, 7, and the last element, 4.
|
||
Their concatenation is 74, and we add it to the concatenation value, so it becomes equal to 74.
|
||
Then we delete them from nums, so nums becomes equal to [52,2].
|
||
- In the second operation:
|
||
We pick the first element, 52, and the last element, 2.
|
||
Their concatenation is 522, and we add it to the concatenation value, so it becomes equal to 596.
|
||
Then we delete them from the nums, so nums becomes empty.
|
||
Since the concatenation value is 596 so the answer is 596.
|
||
</pre>
|
||
|
||
<p><strong class="example">Example 2:</strong></p>
|
||
|
||
<pre>
|
||
<strong>Input:</strong> nums = [5,14,13,8,12]
|
||
<strong>Output:</strong> 673
|
||
<strong>Explanation:</strong> Before performing any operation, nums is [5,14,13,8,12] and concatenation value is 0.
|
||
- In the first operation:
|
||
We pick the first element, 5, and the last element, 12.
|
||
Their concatenation is 512, and we add it to the concatenation value, so it becomes equal to 512.
|
||
Then we delete them from the nums, so nums becomes equal to [14,13,8].
|
||
- In the second operation:
|
||
We pick the first element, 14, and the last element, 8.
|
||
Their concatenation is 148, and we add it to the concatenation value, so it becomes equal to 660.
|
||
Then we delete them from the nums, so nums becomes equal to [13].
|
||
- In the third operation:
|
||
nums has only one element, so we pick 13 and add it to the concatenation value, so it becomes equal to 673.
|
||
Then we delete it from nums, so nums become empty.
|
||
Since the concatenation value is 673 so the answer is 673.
|
||
</pre>
|
||
|
||
<p> </p>
|
||
<p><strong>Constraints:</strong></p>
|
||
|
||
<ul>
|
||
<li><code>1 <= nums.length <= 1000</code></li>
|
||
<li><code>1 <= nums[i] <= 10<sup>4</sup></code></li>
|
||
</ul>
|
||
|
||
<p> </p>
|
||
<style type="text/css">.spoilerbutton {display:block; border:dashed; padding: 0px 0px; margin:10px 0px; font-size:150%; font-weight: bold; color:#000000; background-color:cyan; outline:0;
|
||
}
|
||
.spoiler {overflow:hidden;}
|
||
.spoiler > div {-webkit-transition: all 0s ease;-moz-transition: margin 0s ease;-o-transition: all 0s ease;transition: margin 0s ease;}
|
||
.spoilerbutton[value="Show Message"] + .spoiler > div {margin-top:-500%;}
|
||
.spoilerbutton[value="Hide Message"] + .spoiler {padding:5px;}
|
||
</style>
|