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He is using the ASCII value to set the value in the proper index. "a" ASCII value is 97, so if c is "b" (ASCII value = 98), the index would be "b"-"a" (98-97) = 1.
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Strings: Making Anagrams
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He is using the ASCII value to set the value in the proper index. "a" ASCII value is 97, so if c is "b" (ASCII value = 98), the index would be "b"-"a" (98-97) = 1.