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52 lines
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52 lines
1.9 KiB
HTML
<p>You are given an integer array <code>nums</code>. You can choose <strong>exactly one</strong> index (<strong>0-indexed</strong>) and remove the element. Notice that the index of the elements may change after the removal.</p>
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<p>For example, if <code>nums = [6,1,7,4,1]</code>:</p>
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<ul>
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<li>Choosing to remove index <code>1</code> results in <code>nums = [6,7,4,1]</code>.</li>
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<li>Choosing to remove index <code>2</code> results in <code>nums = [6,1,4,1]</code>.</li>
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<li>Choosing to remove index <code>4</code> results in <code>nums = [6,1,7,4]</code>.</li>
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</ul>
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<p>An array is <strong>fair</strong> if the sum of the odd-indexed values equals the sum of the even-indexed values.</p>
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<p>Return the <em><strong>number</strong> of indices that you could choose such that after the removal, </em><code>nums</code><em> </em><em>is <strong>fair</strong>. </em></p>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> nums = [2,1,6,4]
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<strong>Output:</strong> 1
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<strong>Explanation:</strong>
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Remove index 0: [1,6,4] -> Even sum: 1 + 4 = 5. Odd sum: 6. Not fair.
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Remove index 1: [2,6,4] -> Even sum: 2 + 4 = 6. Odd sum: 6. Fair.
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Remove index 2: [2,1,4] -> Even sum: 2 + 4 = 6. Odd sum: 1. Not fair.
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Remove index 3: [2,1,6] -> Even sum: 2 + 6 = 8. Odd sum: 1. Not fair.
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There is 1 index that you can remove to make nums fair.
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</pre>
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<p><strong>Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> nums = [1,1,1]
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<strong>Output:</strong> 3
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<strong>Explanation:</strong> You can remove any index and the remaining array is fair.
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</pre>
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<p><strong>Example 3:</strong></p>
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<pre>
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<strong>Input:</strong> nums = [1,2,3]
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<strong>Output:</strong> 0
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<strong>Explanation:</strong> You cannot make a fair array after removing any index.
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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 <= 10<sup>5</sup></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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