LeetCode 2084: Drop Type 1 Orders for Customers With Type 0 Orders Solution

Master LeetCode problem 2084 (Drop Type 1 Orders for Customers With Type 0 Orders), 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.

2084. Drop Type 1 Orders for Customers With Type 0 Orders

Medium

Database

Problem Explanation

Explanation:

To solve this problem, we need to drop type 1 orders for customers who have type 0 orders. We can achieve this by iterating through the orders and keeping track of the customers who have type 0 orders. If a customer has a type 0 order, we drop all type 1 orders associated with that customer. We can use a HashMap to store the customer IDs with type 0 orders for quick lookups.

Iterate through the orders and store the customer IDs with type 0 orders in a HashMap.
Iterate through the orders again and drop type 1 orders for customers with type 0 orders.
Return the remaining orders after dropping the type 1 orders.

Time Complexity: O(n) where n is the number of orders Space Complexity: O(n) for the HashMap storing customer IDs with type 0 orders

Solution Code

import java.util.*;

class Solution {
    public List<Integer> dropType1Orders(int[] orders) {
        Map<Integer, Integer> type0Customers = new HashMap<>();
        List<Integer> result = new ArrayList<>();
        
        for (int order : orders) {
            int customerId = order / 10;
            int orderType = order % 10;
            if (orderType == 0) {
                type0Customers.put(customerId, 1);
            }
        }
        
        for (int order : orders) {
            int customerId = order / 10;
            int orderType = order % 10;
            if (orderType == 1 && !type0Customers.containsKey(customerId)) {
                result.add(order);
            }
        }
        
        return result;
    }
}

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