Chef and Chain

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Chef had a hard day and want to play little bit. The game is called "Chain". Chef has the sequence of symbols. Each symbol is either '-' or '+'. The sequence is called Chain if each two neighboring symbols of sequence are either '-+' or '+-'. For example sequence '-+-+-+' is a Chain but sequence '-+-+--+' is not. Help Chef to calculate the minimum number of symbols he need to replace (ex. '-' to

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solution.cppC++17

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