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July 12, 2019 21:10
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| func repeatedNTimes(_ A: [Int]) -> Int { | |
| var set = Set<Int>() | |
| for num in A { | |
| if set.contains(num) { | |
| return num | |
| } | |
| set.insert(num) | |
| } | |
| return -1 | |
| } |
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