Minimum Operations to Convert All Elements to Zero
You are given an array nums of size n, consisting of non-negative integers. Your task is to apply some (possibly zero) operations on the array so that all elements become 0.
In one operation, you can select a subarray [i, j] where 0 <= i <= j < n and set all occurrences of the minimum non-negative integer in that subarray to 0.
Return the minimum number of operations required to make all elements in the array 0.
Example 1
Input
nums = [0,2]Output
1Selecting the subarray [1,1] sets the only occurrence of 2 to 0, so one operation is enough.
Example 2
Input
nums = [3,1,2,1]Output
3The values 1, 2, and 3 can be eliminated in three operations as shown, making all elements 0.
Constraints
- 1 <= n == nums.length <= 10^5
- 0 <= nums[i] <= 10^5