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55 lines
2.2 KiB
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<p>下标从 <strong>0</strong> 开始、长度为 <code>n</code> 的数组 <code>derived</code> 是由同样长度为 <code>n</code> 的原始 <strong>二进制数组</strong> <code>original</code> 通过计算相邻值的 <strong>按位异或(⊕)</strong>派生而来。</p>
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<p>特别地,对于范围 <code>[0, n - 1]</code> 内的每个下标 <code>i</code> :</p>
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<ul>
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<li>如果 <code>i = n - 1</code> ,那么 <code>derived[i] = original[i] ⊕ original[0]</code></li>
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<li>否则 <code>derived[i] = original[i] ⊕ original[i + 1]</code></li>
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</ul>
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<p>给你一个数组 <code>derived</code> ,请判断是否存在一个能够派生得到 <code>derived</code> 的 <strong>有效原始二进制数组</strong> <code>original</code> 。</p>
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<p>如果存在满足要求的原始二进制数组,返回 <em><strong>true</strong> </em>;否则,返回<em> <strong>false</strong> </em>。</p>
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<ul>
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<li>二进制数组是仅由 <strong>0</strong> 和 <strong>1</strong> 组成的数组。</li>
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</ul>
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<p> </p>
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<p><strong>示例 1:</strong></p>
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<pre><strong>输入:</strong>derived = [1,1,0]
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<strong>输出:</strong>true
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<strong>解释:</strong>能够派生得到 [1,1,0] 的有效原始二进制数组是 [0,1,0] :
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derived[0] = original[0] ⊕ original[1] = 0 ⊕ 1 = 1
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derived[1] = original[1] ⊕ original[2] = 1 ⊕ 0 = 1
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derived[2] = original[2] ⊕ original[0] = 0 ⊕ 0 = 0
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</pre>
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<p><strong>示例 2:</strong></p>
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<pre><strong>输入:</strong>derived = [1,1]
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<strong>输出:</strong>true
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<strong>解释:</strong>能够派生得到 [1,1] 的有效原始二进制数组是 [0,1] :
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derived[0] = original[0] ⊕ original[1] = 1
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derived[1] = original[1] ⊕ original[0] = 1
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</pre>
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<p><strong>示例 3:</strong></p>
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<pre><strong>输入:</strong>derived = [1,0]
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<strong>输出:</strong>false
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<strong>解释:</strong>不存在能够派生得到 [1,0] 的有效原始二进制数组。
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</pre>
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<p> </p>
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<p><strong>提示:</strong></p>
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<ul>
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<li><code>n == derived.length</code></li>
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<li><code>1 <= n <= 10<sup>5</sup></code></li>
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<li><code>derived</code> 中的值不是 <strong>0</strong> 就是 <strong>1</strong> 。</li>
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</ul>
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