Hello Guys,
My solution to the question below works with positive numbers but fail when a negative is caught. For example [-3,0,1,-3,1,1,1,-3,10,0] returns true but mine return false. How do I resolve this ?
Given an array of integers arr
, return true
if the number of occurrences of each value in the array is unique , or false
otherwise.
Example 1:
Input: arr = [1,2,2,1,1,3] Output: true Explanation: The value 1 has 3 occurrences, 2 has 2 and 3 has 1. No two values have the same number of occurrences.
Example 2:
Input: arr = [1,2] Output: false
Example 3:
Input: arr = [-3,0,1,-3,1,1,1,-3,10,0] Output: true
func uniqueOccurrences(_ arr: [Int]) -> Bool {
var result = [Int:Int]()
let numbers = Set(arr)
for nums in arr{
if let value = result[nums]{
result[nums] = value+1
}
else{
result[nums] = 1
}
}
print(result)
for k in result.values{
if numbers.contains(k) && k >= 2 {
return true
}
}
return false
}
uniqueOccurrences([1,2,3,45,6,7,8,9,9,])