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LeetCode 582: Kill Process Solution

Master LeetCode problem 582 (Kill Process), a medium 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.

Problem Explanation

Explanation

Given a list of process ids and their corresponding parent process ids, along with a specific process id to kill, we need to find all the process ids that will be killed starting from the given process id.

To solve this problem, we can use a hashmap to represent the parent-child relationships between processes. We first construct this hashmap and then perform a depth-first search (DFS) starting from the given process id to find all the processes that will be killed.

Algorithmic Steps:

  1. Construct a hashmap parentChildMap to store the parent-child relationships.
  2. Construct a list killedProcesses to store the processes that will be killed.
  3. Perform a depth-first search starting from the given process id:
    • Add the current process id to killedProcesses.
    • Recursively call the DFS function for all child processes of the current process id.

Time Complexity:

  • The time complexity of this algorithm is O(n), where n is the number of processes.

Space Complexity:

  • The space complexity of this algorithm is O(n) for storing the parent-child relationships and the killed processes.

Solution Code

class Solution {
    public List<Integer> killProcess(List<Integer> pid, List<Integer> ppid, int kill) {
        Map<Integer, List<Integer>> parentChildMap = new HashMap<>();
        List<Integer> killedProcesses = new ArrayList<>();

        for (int i = 0; i < pid.size(); i++) {
            int parent = ppid.get(i);
            int child = pid.get(i);
            parentChildMap.putIfAbsent(parent, new ArrayList<>());
            parentChildMap.get(parent).add(child);
        }

        dfs(kill, parentChildMap, killedProcesses);
        return killedProcesses;
    }

    private void dfs(int process, Map<Integer, List<Integer>> parentChildMap, List<Integer> killedProcesses) {
        killedProcesses.add(process);
        if (parentChildMap.containsKey(process)) {
            for (int child : parentChildMap.get(process)) {
                dfs(child, parentChildMap, killedProcesses);
            }
        }
    }
}

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