Minimum Change (keteki)

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Given a number N, and a string S. The value of the string is equal to the sum of all the 1 based index positions of the characters in the string, in the English alphabet system (check example in the next line). Example: the value of the string za is 26+1=27. Print the minimum number of characters to change in the string S, such that the value of the string S becomes equal to the number

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solution.cppC++17

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