LeetCode 1495: Friendly Movies Streamed Last Month Solution

Master LeetCode problem 1495 (Friendly Movies Streamed Last Month), 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.

1495. Friendly Movies Streamed Last Month

Easy

Database

Problem Explanation

Explanation:

To solve this problem, we need to find the movies that were streamed by at least two friends in the last month. We can achieve this by using a HashMap to store the count of unique friends who streamed each movie. Then, we iterate through the HashMap and count the movies that were streamed by at least two friends.

Create a HashMap to store the count of unique friends who streamed each movie.
Iterate through the streaming history and update the count in the HashMap.
Iterate through the HashMap and count the movies streamed by at least two friends.

Time Complexity: O(n) where n is the number of streaming records
Space Complexity: O(n) for the HashMap

Solution Code

import java.util.*;

class Solution {
    public int numMoviesViewedLastMonth(List<List<Integer>> movies) {
        Map<Integer, Integer> movieCount = new HashMap<>();
        int result = 0;
        
        for (List<Integer> movie : movies) {
            for (int friend : movie) {
                movieCount.put(friend, movieCount.getOrDefault(friend, 0) + 1);
            }
        }
        
        for (int count : movieCount.values()) {
            if (count >= 2) {
                result++;
            }
        }
        
        return result;
    }
}

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