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| Given a non-empty array of integers, count how many of the values appear exactly one time in the array. Solve this without modifying the given array or creating a new array. singlesCount([4, 7, 4]) → 1 singlesCount([3, 5, 3, 5]) → 0 singlesCount([4, 1, 9]) → 3 ...Save, Compile, Run (ctrl-enter) | 
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Difficulty: 300
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