class Solution:
def minOperations(self, nums: List[int]) -> int:
counter = Counter(nums)
ans = 0
for c in counter.values():
if c == 1:
return -1
ans += ceil(c / 3)
return ans
'''
/*
You are given a 0-indexed array nums consisting of positive integers.
There are two types of operations that you can apply on the array any number of times:
Choose two elements with equal values and delete them from the array.
Choose three elements with equal values and delete them from the array.
Return the minimum number of operations required to make the array empty, or -1 if it is not possible.
Example 1:
Input: nums = [2,3,3,2,2,4,2,3,4]
Output: 4
Explanation: We can apply the following operations to make the array empty:
- Apply the first operation on the elements at indices 0 and 3. The resulting array is nums = [3,3,2,4,2,3,4].
- Apply the first operation on the elements at indices 2 and 4. The resulting array is nums = [3,3,4,3,4].
- Apply the second operation on the elements at indices 0, 1, and 3. The resulting array is nums = [4,4].
- Apply the first operation on the elements at indices 0 and 1. The resulting array is nums = [].
It can be shown that we cannot make the array empty in less than 4 operations.
Example 2:
Input: nums = [2,1,2,2,3,3]
'''
Output: -1
Explanation: It is impossible to empty the array.*/| Associated Context | |
|---|---|
| Type | Code Snippet ( .py ) |
| Associated Tags | Solution class minOperations method nums parameter List[int] list of integers counter variable ans variable for loop if statement ceil function return statement numpy List[int] type hint Counter class |
| 📝 Custom Description | Level up your coding skills and quickly land a job. This is the best place to expand your knowledge and get prepared for your next interview. |
| 💡 Smart Description | This code snippet calculates the minimum number of operations required to take a list of integers as input. It iterates through each integer, and if it is 1, it returns -1; Otherwise, it uses an infinite loop for This code snippet calculates the minimum number of operations needed to make all elements in the given list have a frequency that is a multiple of 3. It returns -1 if it is not possible. |
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