Playing Piano

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You are playing the piano on your PC using a new app in the market. You have to play the most beautiful melody given some conditions. The app uses 26 buttons on the keyboard which are small alphabetical characters 'a' to 'z'. All the letters are distinct. You are given a sequence of values, the i-th element in the array adds $a[i]$ value to the melody. To obtain the $a[i]$ value you have

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solution.cppC++17

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