LeetCode 2960: Count Tested Devices After Test Operations Solution

Master LeetCode problem 2960 (Count Tested Devices After Test Operations), a easy challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

2960. Count Tested Devices After Test Operations

Easy

Array Simulation Counting

Problem Explanation

Explanation

To solve this problem, we can iterate through the array of battery percentages and simulate the testing process for each device. For each device, if its battery percentage is greater than 0, we increment the count of tested devices and decrease the battery percentage of all devices to the right by 1. We ensure that the battery percentage of each device never goes below 0.

We can implement this algorithm with a simple loop that updates the battery percentages accordingly. The time complexity of this solution is O(n) where n is the number of devices, and the space complexity is O(1).

Solution Code

class Solution {
    public int countTestedDevices(int[] batteryPercentages) {
        int n = batteryPercentages.length;
        int testedDevices = 0;

        for (int i = 0; i < n; i++) {
            if (batteryPercentages[i] > 0) {
                testedDevices++;
                for (int j = i + 1; j < n; j++) {
                    batteryPercentages[j] = Math.max(0, batteryPercentages[j] - 1);
                }
            }
        }

        return testedDevices;
    }
}

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