LeetCode 1113: Reported Posts Solution

Master LeetCode problem 1113 (Reported Posts), 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.

1113. Reported Posts

Easy

Database

Problem Explanation

Explanation

To solve this problem, we can iterate over the list of reported posts and maintain a count of each post's report count. Then, we can iterate over the list of posts and check if the post has been reported more than the threshold. If so, we add it to the result list.

Algorithm

Create a map to store the count of each reported post.
Iterate over the list of reported posts and update the count in the map.
Iterate over the list of posts and check if the post has been reported more than the threshold.
If the count exceeds the threshold, add the post to the result list.
Return the result list.

Time Complexity

The time complexity of this algorithm is O(n), where n is the total number of reported posts and posts.

Space Complexity

The space complexity of this algorithm is O(n), where n is the total number of reported posts.

Solution Code

import java.util.*;

class Solution {
    public List<Integer> reportPosts(int[] reported, int[] posts, int threshold) {
        Map<Integer, Integer> reportCount = new HashMap<>();
        List<Integer> result = new ArrayList<>();
        
        for (int report : reported) {
            reportCount.put(report, reportCount.getOrDefault(report, 0) + 1);
        }
        
        for (int post : posts) {
            if (reportCount.containsKey(post) && reportCount.get(post) >= threshold) {
                result.add(post);
            }
        }
        
        return result;
    }
}

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