LeetCode 3310: Remove Methods From Project Solution

Master LeetCode problem 3310 (Remove Methods From Project), 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.

3310. Remove Methods From Project

Medium

Depth-First Search Breadth-First Search Graph

Problem Explanation

Explanation:

To solve this problem, we can use a depth-first search (DFS) approach to identify and remove suspicious methods along with their dependencies. We will start by building a directed graph representing method invocations. Then, we will perform a DFS starting from the suspicious method k to mark all methods that are directly or indirectly invoked by k as suspicious. Finally, we will iterate through all methods and include only those that are not marked as suspicious in the final result.

Algorithm:

Build a directed graph representing method invocations.
Perform DFS starting from the suspicious method k to mark all suspicious methods.
Iterate through all methods and include only those that are not marked as suspicious in the final result.

Time Complexity:

The time complexity of this approach is O(n + m), where n is the number of methods and m is the number of invocations.

Space Complexity:

The space complexity of this approach is O(n + m) for storing the graph and the visited array.

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Solution Code

class Solution {
    public int[] removeMethods(int n, int k, int[][] invocations) {
        List<Integer>[] graph = new ArrayList[n];
        for (int i = 0; i < n; i++) {
            graph[i] = new ArrayList<>();
        }
        for (int[] invocation : invocations) {
            graph[invocation[0]].add(invocation[1]);
        }
        
        boolean[] suspicious = new boolean[n];
        dfs(graph, k, suspicious);
        
        List<Integer> result = new ArrayList<>();
        for (int i = 0; i < n; i++) {
            if (!suspicious[i]) {
                result.add(i);
            }
        }
        
        return result.stream().mapToInt(Integer::intValue).toArray();
    }
    
    private void dfs(List<Integer>[] graph, int k, boolean[] suspicious) {
        suspicious[k] = true;
        for (int next : graph[k]) {
            if (!suspicious[next]) {
                dfs(graph, next, suspicious);
            }
        }
    }
}

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