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52 lines
2.4 KiB
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52 lines
2.4 KiB
HTML
<p>You are given an integer array <code>nums</code> of length <code>n</code>, where <code>nums</code> is a <strong><span data-keyword="permutation-array">permutation</span></strong> of the numbers in the range <code>[0..n - 1]</code>.</p>
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<p>You may swap elements at indices <code>i</code> and <code>j</code> <strong>only if</strong> <code>nums[i] AND nums[j] == k</code>, where <code>AND</code> denotes the bitwise AND operation and <code>k</code> is a <strong>non-negative</strong> integer.</p>
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<p>Return the <strong>maximum</strong> value of <code>k</code> such that the array can be sorted in <strong>non-decreasing</strong> order using any number of such swaps. If <code>nums</code> is already sorted, return 0.</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 = [0,3,2,1]</span></p>
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<p><strong>Output:</strong> <span class="example-io">1</span></p>
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<p><strong>Explanation:</strong></p>
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<p>Choose <code>k = 1</code>. Swapping <code>nums[1] = 3</code> and <code>nums[3] = 1</code> is allowed since <code>nums[1] AND nums[3] == 1</code>, resulting in a sorted permutation: <code>[0, 1, 2, 3]</code>.</p>
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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 = [0,1,3,2]</span></p>
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<p><strong>Output:</strong> <span class="example-io">2</span></p>
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<p><strong>Explanation:</strong></p>
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<p>Choose <code>k = 2</code>. Swapping <code>nums[2] = 3</code> and <code>nums[3] = 2</code> is allowed since <code>nums[2] AND nums[3] == 2</code>, resulting in a sorted permutation: <code>[0, 1, 2, 3]</code>.</p>
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</div>
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<p><strong class="example">Example 3:</strong></p>
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<div class="example-block">
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<p><strong>Input:</strong> <span class="example-io">nums = [3,2,1,0]</span></p>
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<p><strong>Output:</strong> <span class="example-io">0</span></p>
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<p><strong>Explanation:</strong></p>
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<p>Only <code>k = 0</code> allows sorting since no greater <code>k</code> allows the required swaps where <code>nums[i] AND nums[j] == k</code>.</p>
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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>1 <= n == nums.length <= 10<sup>5</sup></code></li>
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<li><code>0 <= nums[i] <= n - 1</code></li>
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<li><code>nums</code> is a permutation of integers from <code>0</code> to <code>n - 1</code>.</li>
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</ul>
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