下标从 0 开始、长度为 n
的数组 derived
是由同样长度为 n
的原始 二进制数组 original
通过计算相邻值的 按位异或(⊕)派生而来。
特别地,对于范围 [0, n - 1]
内的每个下标 i
:
i = n - 1
,那么 derived[i] = original[i] ⊕ original[0]
derived[i] = original[i] ⊕ original[i + 1]
给你一个数组 derived
,请判断是否存在一个能够派生得到 derived
的 有效原始二进制数组 original
。
如果存在满足要求的原始二进制数组,返回 true ;否则,返回 false 。
示例 1:
输入:derived = [1,1,0] 输出:true 解释:能够派生得到 [1,1,0] 的有效原始二进制数组是 [0,1,0] : derived[0] = original[0] ⊕ original[1] = 0 ⊕ 1 = 1 derived[1] = original[1] ⊕ original[2] = 1 ⊕ 0 = 1 derived[2] = original[2] ⊕ original[0] = 0 ⊕ 0 = 0
示例 2:
输入:derived = [1,1] 输出:true 解释:能够派生得到 [1,1] 的有效原始二进制数组是 [0,1] : derived[0] = original[0] ⊕ original[1] = 1 derived[1] = original[1] ⊕ original[0] = 1
示例 3:
输入:derived = [1,0] 输出:false 解释:不存在能够派生得到 [1,0] 的有效原始二进制数组。
提示:
n == derived.length
1 <= n <= 105
derived
中的值不是 0 就是 1 。