func solution(arr:[Int])->Int{
var dup:Int = -1
for i in arr{
let dupInt:[Int] = arr.filter{ $0 == i }
if dupInt.count > 1 {
dup = i
break
}
}
return dup
}
func solution(arr:[Int])->Int{
var dup:Int = -1
for i in arr{
let dupInt:[Int] = arr.filter{ $0 == i }
if dupInt.count > 1 {
dup = i
break
}
}
return dup
}
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本文标题：[Codility] Duplicate Item in arr
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