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You are given two numeric strings num1 and num2 and two integers max_sum and min_sum.We denote an integer x to be good if:. num1 <= x <= num2; min_sum <= digit_sum(x) <= max_sum.; Return the number of good integers.Since the answer may be large, return it modulo 10 9 + 7.. Note that digit_sum(x) denotes the sum of the digits of x.. Example 1:
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BetaWelcome to my Dynamic Programming (DP) Problem Sheet! This is an ever-growing list of DP problems from LeetCode. Dynamic programming is a powerful technique used to solve optimization problems by breaking them down into simpler subproblems and storing their solutions to avoid redundant computations.
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BetaDigit dp is a very easy technique and also useful to solve many dynamic programming problems. Seeing the name “Digit DP” it’s easy to guess that we are going to do something using the digits. Yes we are actually going to play with digits. Let’s explain the concept using a classical problem. Problem
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BetaLet given number x has n digits. The main idea of digit DP is to first represent the digits as an array of digits t[]. Let's say a we have t n t n-1 t n-2... t 2 t 1 as the decimal representation where t i (0 < i <= n) tells the i-th digit from the right. The leftmost digit t n is the most significant digit.
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BetaWe went through a lot of (almost all) DP problems on leetcode and came up a study list here. I think it pretty much covers all the patterns necessary for leetcode. What's special about the list 1) goes from simpler to more complex patterns 2) categorized by state transition (explained in the video walkthrough) so if you solve the first problem ...
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BetaDigit DP is a technique used to solve problems that asks you to find the number of integers within a range that satisfies some property based on the digits of the integers. Typically, the ranges are between large integers (such as between 1 1 1 to 10 18 10^{18} 1 0 18 ), so looping through each integer and checking if it satisfies the given ...
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BetaUnderstand the Patterns: Even though the questions are shuffled, try to identify the underlying DP patterns as you solve each problem. This will help reinforce your understanding. Time Management: Allocate specific time slots each day dedicated to solving these problems to maintain consistency. Review and Revise: After solving, revisit the problems after a few days to ensure you've retained ...
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BetaCommon DP patterns that show up on LeetCode # The best way to simplify LeetCode dynamic programming problems is to group them into repeatable patterns. These patterns appear repeatedly across questions with slight variations. Here are the most common: 0/1 Knapsack: Subset sums, decisions to include or exclude items
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BetaLevel up your coding skills and quickly land a job. This is the best place to expand your knowledge and get prepared for your next interview.
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BetaThe Digit DP Pattern is useful when: ... You want to optimize space usage in DP solutions. LeetCode Problems: LeetCode 1986: Minimum Number of Work Sessions to Finish the Tasks. ... If you have any questions or suggestions, leave a comment. This post is public so feel free to share it.
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