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List< Integer> passedNumbers = new ArrayList<>(); for (int i = 0; i a.size(); i++) { if(!passedNumbers.contains(a.get(i))) { passedNumbers.add(a.get(i)); } else { passedNumbers.remove(a.get(i)); } } return passedNumbers.get(0)
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Lonely Integer
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List< Integer> passedNumbers = new ArrayList<>(); for (int i = 0; i a.size(); i++) { if(!passedNumbers.contains(a.get(i))) { passedNumbers.add(a.get(i)); } else { passedNumbers.remove(a.get(i)); } } return passedNumbers.get(0)