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Given a string, return a count of the number of characters in the string that appear exactly one time in the string. For example, in the string "bacbaae", only the 2 characters "c" and "e" appear one time, so countSingles("bacbaae") should return 2. countSingles("bacbaae") → 2 countSingles("abc") → 3 countSingles("xx") → 0 ...Save, Compile, Run (ctrl-enter) |
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Difficulty: 300
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