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60 lines
2.5 KiB
HTML
60 lines
2.5 KiB
HTML
<p><strong>Attention</strong>: In this version, the number of operations that can be performed, has been increased to <strong>twice</strong>.<!-- notionvc: 278e7cb2-3b05-42fa-8ae9-65f5fd6f7585 --></p>
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<p>You are given an array <code>nums</code> consisting of positive integers.</p>
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<p>We call two integers <code>x</code> and <code>y</code> <strong>almost equal</strong> if both integers can become equal after performing the following operation <strong>at most <u>twice</u></strong>:</p>
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<ul>
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<li>Choose <strong>either</strong> <code>x</code> or <code>y</code> and swap any two digits within the chosen number.</li>
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</ul>
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<p>Return the number of indices <code>i</code> and <code>j</code> in <code>nums</code> where <code>i < j</code> such that <code>nums[i]</code> and <code>nums[j]</code> are <strong>almost equal</strong>.</p>
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<p><strong>Note</strong> that it is allowed for an integer to have leading zeros after performing an operation.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<div class="example-block">
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<p><strong>Input:</strong> <span class="example-io">nums = [1023,2310,2130,213]</span></p>
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<p><strong>Output:</strong> <span class="example-io">4</span></p>
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<p><strong>Explanation:</strong></p>
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<p>The almost equal pairs of elements are:</p>
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<ul>
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<li>1023 and 2310. By swapping the digits 1 and 2, and then the digits 0 and 3 in 1023, you get 2310.</li>
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<li>1023 and 213. By swapping the digits 1 and 0, and then the digits 1 and 2 in 1023, you get 0213, which is 213.</li>
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<li>2310 and 213. By swapping the digits 2 and 0, and then the digits 3 and 2 in 2310, you get 0213, which is 213.</li>
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<li>2310 and 2130. By swapping the digits 3 and 1 in 2310, you get 2130.</li>
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</ul>
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</div>
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<p><strong class="example">Example 2:</strong></p>
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<div class="example-block">
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<p><strong>Input:</strong> <span class="example-io">nums = [1,10,100]</span></p>
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<p><strong>Output:</strong> <span class="example-io">3</span></p>
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<p><strong>Explanation:</strong></p>
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<p>The almost equal pairs of elements are:</p>
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<ul>
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<li>1 and 10. By swapping the digits 1 and 0 in 10, you get 01 which is 1.</li>
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<li>1 and 100. By swapping the second 0 with the digit 1 in 100, you get 001, which is 1.</li>
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<li>10 and 100. By swapping the first 0 with the digit 1 in 100, you get 010, which is 10.</li>
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</ul>
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</div>
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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>2 <= nums.length <= 5000</code></li>
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<li><code>1 <= nums[i] < 10<sup>7</sup></code></li>
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</ul>
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