g2901_3000.s2960_count_tested_devices_after_test_operations.Solution

public class Solution extends Object

2960 - Count Tested Devices After Test Operations.

Easy

You are given a 0-indexed integer array batteryPercentages having length n, denoting the battery percentages of n 0-indexed devices.

Your task is to test each device i in order from 0 to n - 1, by performing the following test operations:

If batteryPercentages[i] is greater than 0:
- Increment the count of tested devices.
- Decrease the battery percentage of all devices with indices j in the range [i + 1, n - 1] by 1, ensuring their battery percentage never goes below 0, i.e, batteryPercentages[j] = max(0, batteryPercentages[j] - 1).
- Move to the next device.
Otherwise, move to the next device without performing any test.

Return an integer denoting the number of devices that will be tested after performing the test operations in order.

Example 1:

Input: batteryPercentages = [1,1,2,1,3]

Output: 3

Explanation: Performing the test operations in order starting from device 0:

At device 0, batteryPercentages[0] > 0, so there is now 1 tested device, and batteryPercentages becomes [1,0,1,0,2].

At device 1, batteryPercentages[1] == 0, so we move to the next device without testing.

At device 2, batteryPercentages[2] > 0, so there are now 2 tested devices, and batteryPercentages becomes [1,0,1,0,1].

At device 3, batteryPercentages[3] == 0, so we move to the next device without testing.

At device 4, batteryPercentages[4] > 0, so there are now 3 tested devices, and batteryPercentages stays the same.

So, the answer is 3.

Example 2:

Input: batteryPercentages = [0,1,2]

Output: 2

Explanation: Performing the test operations in order starting from device 0:

At device 0, batteryPercentages[0] == 0, so we move to the next device without testing.

At device 1, batteryPercentages[1] > 0, so there is now 1 tested device, and batteryPercentages becomes [0,1,1].

At device 2, batteryPercentages[2] > 0, so there are now 2 tested devices, and batteryPercentages stays the same.

So, the answer is 2.

Constraints:

Constructor Details
- Solution
  
  public Solution()
Method Details
- countTestedDevices
  
  public int countTestedDevices(int[] batteryPercentages)

Class Solution

Constructor Summary