LeetCode 2020: Number of Accounts That Did Not Stream Solution

Master LeetCode problem 2020 (Number of Accounts That Did Not Stream), 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.

2020. Number of Accounts That Did Not Stream

Medium

Database

Problem Explanation

Explanation

The problem asks us to find the number of accounts that did not stream on any day. To solve this problem, we can iterate through each account and mark the days they streamed. After that, we count the number of accounts that did not stream on any day.

Create a set to store the days when accounts stream.
Iterate through each account and mark the days they streamed.
Iterate through the accounts again and check if they streamed on any day. If not, increment the count.
Return the count of accounts that did not stream on any day.

Time Complexity: O(n * d), where n is the number of accounts and d is the number of days.

Space Complexity: O(n * d) for the set storing the days each account streamed.

Solution Code

class Solution {
    public int numberOfAccountsThatDidNotStream(int[][] accounts) {
        Set<Integer> streamingDays = new HashSet<>();
        int n = accounts.length;
        
        for (int[] account : accounts) {
            for (int day : account) {
                streamingDays.add(day);
            }
        }
        
        int count = 0;
        for (int[] account : accounts) {
            boolean streamed = false;
            for (int day : account) {
                if (streamingDays.contains(day)) {
                    streamed = true;
                    break;
                }
            }
            if (!streamed) {
                count++;
            }
        }
        
        return count;
    }
}

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