LeetCode: backtracking promotions, coupons, offers

Coupons or deals or discounts or promotions or vouchers are special offers that LeetCode provides to its users to help them save money on their purchases of premium subscriptions, courses, or merchandise. They can be applied at checkout to reduce the total amount of the order.

There are several ways to get coupons or deals or discounts or promotions or vouchers on LeetCode. Some of them are: - Participating in LeetCode contests, events, or challenges and earning rewards. - Referring your friends to LeetCode and getting referral bonuses. - Following LeetCode on social media platforms and staying tuned for exclusive offers. - Joining LeetCode's newsletter and receiving updates on the latest deals and promotions. - Checking LeetCode's website regularly for any ongoing or upcoming sales or discounts.

To use coupons or deals or discounts or promotions or vouchers on LeetCode, you need to: - Select the item or service that you want to purchase and add it to your cart. - Go to your cart and click on the 'Apply Coupon' button. - Enter the coupon code in the box and click on the 'Apply' button. - The discount will be applied to your order and you can proceed to checkout.

The terms and conditions for coupons or deals or discounts or promotions or vouchers on LeetCode may vary depending on the type and duration of the offer. However, some general terms and conditions are: - Coupons or deals or discounts or promotions or vouchers are valid for a limited time only and may expire without prior notice. - Coupons or deals or discounts or promotions or vouchers are not transferable, exchangeable, or refundable. - Coupons or deals or discounts or promotions or vouchers cannot be combined with other offers or discounts. - Coupons or deals or discounts or promotions or vouchers are subject to availability and may have quantity or usage limits. - LeetCode reserves the right to modify, cancel, or terminate any coupon or deal or discount or promotion or voucher at any time and for any reason.

Some popular coding problems on LeetCode are: - Two Sum, which asks you to find two numbers in an array that add up to a target value. - Longest Substring Without Repeating Characters, which asks you to find the length of the longest substring without repeating characters. - Median of Two Sorted Arrays, which asks you to find the median of two sorted arrays of different sizes. - Valid Parentheses, which asks you to determine if a string of parentheses, brackets, and braces is valid. - Merge Two Sorted Lists, which asks you to merge two sorted linked lists and return a new sorted list.

It does not cost anything to use LeetCode Basic, which gives you access to most of the coding problems, solutions, and discussions. However, if you want to unlock more features and benefits, you can subscribe to LeetCode Premium, which costs $35 per month or $159 per year.

Yes, you can download the solutions from other users on LeetCode by clicking on the "Download Code" button on the top right corner of the solution page. You can also copy and paste the code to your own editor or IDE. However, you should always try to understand the logic and algorithm behind the solution, and not just copy it blindly.

The difference between LeetCode Premium and Basic is that LeetCode Premium offers more features and benefits, such as: - Access to over 300 exclusive coding problems that are frequently asked by top companies in interviews. - Access to the premium Explore section, which provides curated study plans and learning resources. - Access to the premium Playground section, which allows you to write, run, and debug code in various languages and environments. - Access to the premium Mock Interview section, which simulates real interview scenarios and gives you feedback and tips. - Access to the premium Contest section, which lets you participate in weekly and biweekly coding contests and compete with other users. - Access to the premium Statistics section, which shows you detailed analytics and insights on your performance and progress. - Access to the premium Career section, which helps you prepare your resume, portfolio, and cover letter. - Access to the premium Community section, which connects you with other users and mentors who can help you with your coding journey.

No, they do not have any physical stores in the United States. LeetCode is an online platform that provides coding and algorithmic problems for users to practice and learn. You can access LeetCode through their website or their mobile app.

You can contact their customer service by sending an email to [email protected] or by filling out the contact form on their website. You can also visit their FAQ page to find answers to common questions and issues.