Minimum Number of Operations to Make Array Empty - Practice Coding | SlaveCode
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2870. Minimum Number of Operations to Make Array Empty
Medium
30 Points
Array
Hash Table
Greedy
Counting
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:
Return the minimum number of operations required to make the array empty, or -1 if it is not possible.
Examples
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.
Constraints
2 <= nums.length <= 105
1 <= nums[i] <= 106
2870. Minimum Number of Operations to Make Array Empty
Medium
30 Points
Array
Hash Table
Greedy
Counting
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:
Return the minimum number of operations required to make the array empty, or -1 if it is not possible.
Examples
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.