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97 is the ASCII code of character a. Since the string only consist of lower case letters, there's an array of size 26.
To store the count of letter a means subtract 97 from character and add one to it's array value
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97 is the ASCII code of character a. Since the string only consist of lower case letters, there's an array of size 26. To store the count of letter a means subtract 97 from character and add one to it's array value