You are given a binary string of even length and equal number of 0’s and 1’s. What is the minimum number of swaps to make the string alternating. A binary string is alternating if no two consecutive elements are equal.
Input : 000111 Output : 1 Explanation : Swap index 2 and index 5 to get 010101 Input : 1010 Output : 0
We may either get a 1 at first position or a zero at first position. We consider two cases and find the minimum of two cases. Note that it is given that there are equal of numbers of 1’s and 0’s in the string and string is of even length.
1. Count number of zeroes at odd position and even position of the string. Let their count be odd_0 and even_0 respectively.
2. Count number of ones at odd position and even position of the string. Let their count be odd_1 and even_1 respectively.
3. We will always swap a 1 with a 0 (never a 1 with a 1 or a 0 with a 0). So we just check if our alternating string starts with 0 then the number of swaps is min(even_0, odd_1) and if our alternating string starts with 1 then the number of swaps is min(even_1, odd_0). The answer is min of these two .
Below is the implementation of above approach:
- Minimum swaps required to make a binary string divisible by 2^k
- Minimum swaps required to convert one binary string to another
- Minimum number of replacements to make the binary string alternating | Set 2
- Minimum number of swaps to make two binary string equal
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- Minimum number of operations required to sum to binary string S
- Minimum given operations required to convert a given binary string to all 1's
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- Minimum number of characters to be removed to make a binary string alternate
- Minimum number of pairs required to make two strings same
- Minimum removals required to make ranges non-overlapping
- Minimum changes required to make all element in an array equal
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