g0901_1000.s0927_three_equal_parts

Class Solution

java.lang.Object

g0901_1000.s0927_three_equal_parts.Solution

public class Solution
extends Object

927 - Three Equal Parts.

Hard

You are given an array arr which consists of only zeros and ones, divide the array into three 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:

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

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: arr = [1,0,1,0,1]

Output: [0,3]

Example 2:

Input: arr = [1,1,0,1,1]

Output: [-1,-1]

Example 3:

Input: arr = [1,1,0,0,1]

Output: [0,2]

Constraints:

• 3 <= arr.length <= 3 * 104
• arr[i] is 0 or 1

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
int[]	threeEqualParts(int[] arr)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Solution

public Solution()

Method Detail

threeEqualParts

public int[] threeEqualParts(int[] arr)