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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>
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<p>The <strong>concatenation</strong> of two numbers is the number formed by concatenating their numerals.</p>
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<ul>
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<li>For example, the concatenation of <code>15</code>, <code>49</code> is <code>1549</code>.</li>
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</ul>
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<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>
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<ul>
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<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>
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<li>If one element exists, add its value to the <strong>concatenation value</strong> of <code>nums</code>, then delete it.</li>
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</ul>
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<p>Return<em> the concatenation value of the <code>nums</code></em>.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> nums = [7,52,2,4]
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<strong>Output:</strong> 596
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<strong>Explanation:</strong> Before performing any operation, nums is [7,52,2,4] and concatenation value is 0.
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- In the first operation:
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We pick the first element, 7, and the last element, 4.
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Their concatenation is 74, and we add it to the concatenation value, so it becomes equal to 74.
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Then we delete them from nums, so nums becomes equal to [52,2].
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- In the second operation:
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We pick the first element, 52, and the last element, 2.
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Their concatenation is 522, and we add it to the concatenation value, so it becomes equal to 596.
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Then we delete them from the nums, so nums becomes empty.
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Since the concatenation value is 596 so the answer is 596.
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</pre>
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<p><strong class="example">Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> nums = [5,14,13,8,12]
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<strong>Output:</strong> 673
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<strong>Explanation:</strong> Before performing any operation, nums is [5,14,13,8,12] and concatenation value is 0.
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- In the first operation:
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We pick the first element, 5, and the last element, 12.
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Their concatenation is 512, and we add it to the concatenation value, so it becomes equal to 512.
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Then we delete them from the nums, so nums becomes equal to [14,13,8].
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- In the second operation:
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We pick the first element, 14, and the last element, 8.
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Their concatenation is 148, and we add it to the concatenation value, so it becomes equal to 660.
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Then we delete them from the nums, so nums becomes equal to [13].
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- In the third operation:
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nums has only one element, so we pick 13 and add it to the concatenation value, so it becomes equal to 673.
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Then we delete it from nums, so nums become empty.
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Since the concatenation value is 673 so the answer is 673.
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</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>1 <= nums.length <= 1000</code></li>
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<li><code>1 <= nums[i] <= 10<sup>4</sup></code></li>
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</ul>
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<p> </p>
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