Package g1501_1600.s1573_number_of_ways_to_split_a_string

Class Solution

java.lang.Object
g1501_1600.s1573_number_of_ways_to_split_a_string.Solution
public class Solution extends java.lang.Object
1573 - Number of Ways to Split a String.

Medium

Given a binary string s, you can split s into 3 non-empty strings s1, s2, and s3 where s1 + s2 + s3 = s.

Return the number of ways s can be split such that the number of ones is the same in s1, s2, and s3. Since the answer may be too large, return it modulo 109 + 7.

Example 1:

Input: s = “10101”

Output: 4

Explanation: There are four ways to split s in 3 parts where each part contain the same number of letters ‘1’.

“1|010|1”

“1|01|01”

“10|10|1”

“10|1|01”

Example 2:

Input: s = “1001”

Output: 0

Example 3:

Input: s = “0000”

Output: 3

Explanation: There are three ways to split s in 3 parts.

“0|0|00”

“0|00|0”

“00|0|0”

Constraints:

  • 3 <= s.length <= 105
  • s[i] is either '0' or '1'.

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    int
    numWays(java.lang.String s)
     

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • numWays

      public int numWays(java.lang.String s)