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Published: Jul 25, 2019 License: MIT Imports: 0 Imported by: 0


927. Three Equal Parts

Given an array A of 0s and 1s, divide the array into 3 non-empty parts such that all of these parts represent the same binary value.

If it is possible, return any [i, j] with i+1 < j, such that:

  • A[0], A[1], ..., A[i] is the first part;
  • A[i+1], A[i+2], ..., A[j-1] is the second part, and
  • A[j], A[j+1], ..., A[A.length - 1] is the third part.
  • All three parts have equal binary value.

If it is not possible, return [-1, -1].

Note that the entire part is used when considering what binary value it represents. For example, [1,1,0] represents 6 in decimal, not 3. Also, leading zeros are allowed, so [0,1,1] and [1,1] represent the same value.

Example 1:

Input: [1,0,1,0,1]
Output: [0,3]

Example 2:

Input: [1,1,0,1,1]
Output: [-1,-1]


  1. 3 <= A.length <= 30000
  2. A[i] == 0 or A[i] == 1


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