LeetCode 1149: Article Views II Solution

Master LeetCode problem 1149 (Article Views II), 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.

1149. Article Views II

Medium

Database

Problem Explanation

Explanation:

To solve this problem, we can keep track of the total number of views each day and calculate the total number of views for the past 7 days at any given day. We can maintain a sliding window of size 7 and update the total views accordingly.

Algorithm:

Initialize an array views to store the total number of views each day.
Initialize a variable totalViews to store the total number of views for the past 7 days.
Initialize a deque deque to store the views for the past 7 days.
Iterate through the input arr:
- Add the current day's views to totalViews.
- Add the current day's views to the deque.
- If the size of the deque exceeds 7, remove the oldest day's views from both totalViews and the deque.
- Update the views array with the total views for the current day.
Return the views array.

Time Complexity:

The time complexity of this solution is O(n) where n is the number of elements in the input array.

Space Complexity:

The space complexity of this solution is O(n) where n is the number of elements in the input array.

: :

Solution Code

class Solution {
    public int[] dailyTemperatures(int[] T) {
        int[] views = new int[T.length];
        int totalViews = 0;
        Deque<Integer> deque = new LinkedList<>();
        
        for (int i = 0; i < T.length; i++) {
            totalViews += T[i];
            deque.add(T[i]);
            
            if (deque.size() > 7) {
                int oldestView = deque.poll();
                totalViews -= oldestView;
            }
            
            views[i] = totalViews;
        }
        
        return views;
    }
}

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