How to solve a problem on unique occurrences
Problem
Given a list of integers, return whether or not the occurrence of every value in the array is unique.
Note: Numbers can be negative.
Example 1
nums = [5, 3, 1, 8, 3, 1, 1, 8, 8, 8]
Output:- True
Explanation
| Element | Ocuurrences |
|---|---|
| 1 | 3 |
| 3 | 2 |
| 5 | 1 |
| 8 | 4 |
Since all occurrences are unique, it returns true.
Example 2
Let’s try another example:
nums= [3, 1, 1, 2, 2, 2, 3]
Algorithm
To solve this problem we need to:
- find the number of times each element occurred
- check the occurrence value – it should be
unique different values
Explanation
First, find out the occurrence number of each element in the given list(nums). Then, save the occurrence value/number in list_occur.
nums= [3, 1, 1, 2, 2, 2, 3]list_element,list_occur=[],[]for i in nums:occur=nums.count(i) #no of occurrenceif(i not in list_element): #ignoring appending of reapted occurrencelist_element.append(i) #appending elements which done counting occurrencelist_occur.append(occur) #occurrence valuesprint(list_occur)
Now, since we have the occurrence value of each element in the list, we have to check if the occurrence number of every value in the list is unique.
To do this, we just compare the values within list_occur.
nums= [3, 1, 1,1, 2, 2, 2, 3]list_element,list_occur=[],[]for i in nums:occur=nums.count(i) #no of occurrenceif(i not in list_element): #ignoring appending of reapter occurrencelist_element.append(i) #appending elements which done counting occurrencelist_occur.append(occur) #occurrence valuesprint(list_occur)#checking occurrences are uniquefor i in list_occur:occur=list_occur.count(i)if(occur>1):print("False")breakelse:print("True")
The whole program code is below, in the form of a function:
def solve(nums):list_ele,list_occ=[],[]for i in nums:occur=nums.count(i)if(i not in list_ele):list_ele.append(i)list_occ.append(occur)for i in list_occ:occur=list_occ.count(i)if(occur>1):return Falsereturn Trueprint("nums=[3, 1, 1, 2, 2, 2, 3] ",solve([3, 1, 1, 2, 2, 2, 3]))print("nums=[-3, -1, -1, -1, -2, -2] ",solve([-3, -1, -1, -1, -2, -2]))print("nums=[5, 3, 1, 8, 3, 1, 1, 8, 8, 8] ",solve([5, 3, 1, 8, 3, 1, 1, 8, 8, 8]))