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HIIT Open 2018
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CSES - HIIT Open 2018 - Inversions
|Time limit:||1.00 s|
|Memory limit:||512 MB|
You are given a bit string, and your task is to modify it so that no adjacent bits have the same value. On each turn, you may select any bit and invert
it (from 0 to 1 or from 1 to 0). What is the minimum number of inversions if you act optimally?
The only input line has a bit string of length $n$.
Print one integer: the minimum number of inversions.
Explanation: You can invert the third and fourth bit, and the resulting string is 010101.