Given a binary string (consists of only 0 and 1). If there is “100” as a sub-string in the string, then we can delete this sub-string. The task is to find the length of longest sub-string which can be make removed?
Example 1:
Input :
str = "1011100000100"
Output :
6
Explanation :
Sub-strings present in str that can be make
removed 101{110000}0{100}. First
sub-string 110000-->100-->null, length is = 6.
Second sub-string 100-->null, length is = 3
Example 2:
Input :
str = "111011"
Output :
0
Explanation :
There is no sub-string which can be make null.
Your Task:
You don't need to read input or print anything. Your task is to complete the function longestNull() which takes the string S[] as inputs and returns the length of the longest string that can be removed.
Expected Time Complexity: O(N) Expected Auxiliary Space: O(N)
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Avoid using static/global variables in coding problems as your code is tested
against multiple test cases and these tend to retain their previous values.
Passing the Sample/Custom Test cases in coding problems does not guarantee the
correctness of code. On submission, your code is tested against multiple test cases
consisting of all possible corner cases and stress constraints.
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