To also handle zero and negative numbers. How to find the odd numbers in a given range in Python? Example 1: Input: n = 1 Output: 5 Explanation: The good numbers of length 1 are "0", "2", "4", "6", "8". Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. I think the time complexity of this code can still be improved. Example 2 - Count Digits in a Number using String. Similarly for 3 digits we have odd digits, we have odd digits. There are three cases then needs to be handled: In case it is ) then next character can be either ( or a digit. If a crystal has alternating layers of different atoms, will it display different properties depending on which layer is exposed? Here is my solution: We haven't defined count_primes yet so inputs above 1000 will cause an error. atom. 593), Stack Overflow at WeAreDevelopers World Congress in Berlin, Stack implementation using only one queue in C, Checking if a Stack is sorted in ascending order, Return whether the cards can be rearranged, Kotlin Stack using an ArrayList to compare and remove elements, Finding the minimum element of a stack of numbers, Non-compact manifolds with finite volume and conformal transformation. 592), How the Python team is adapting the language for an AI future (Ep. O(n, k). Create a boolean list/array of size n. The index starts from 0 and runs until n-1. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 0 <= n <= 5 * 106 How do we check if a number is prime? rev2023.7.24.43543. /problems/count-the-digits-that-divide-a-number/submissions/ Explanation: There are 4 prime numbers less than 10, they are 2, 3, 5, 7. So basically in this problem we have a knight (from chess) and a keypad from a phone. Start from index 2, all the index numbers that are multiples of 2 are marked False. Reason not to use aluminium wires, other than higher resitance. rev2023.7.24.43543. Detailed explanation and mathematical proof of time complexity can be found here. This is the base case. In the end just add all elements in the stack and sort it. Here is the prime-counting function (actually, it returns the primes less than or equal to n): Putting two and two together, we can call the count_primes function with something like 2000: which should return the primes less than 2000: Thanks for contributing an answer to Stack Overflow! Are there any practical use cases for subtyping primitive types? Asking for help, clarification, or responding to other answers. O(N), as we create a hash table to store if a number is prime or not. of ordered subsets having a particular XOR value, Count numbers in a range with digit sum divisible by K having first and last digit different, Count of N-digit numbers having each digit as the mean of its adjacent digits, Count the number of occurrences of a particular digit in a number, Count of N digit numbers not having given prefixes, Count possible N-digit numbers such that each digit does not appear more than given number of times consecutively, Count of N-digit Numbers having Sum of even and odd positioned digits divisible by given numbers, Count of N-digit numbers having equal count of distinct odd and even digits, Mathematical and Geometric Algorithms - Data Structure and Algorithm Tutorials, Learn Data Structures with Javascript | DSA Tutorial, Introduction to Max-Heap Data Structure and Algorithm Tutorials, Introduction to Set Data Structure and Algorithm Tutorials, Introduction to Map Data Structure and Algorithm Tutorials, A-143, 9th Floor, Sovereign Corporate Tower, Sector-136, Noida, Uttar Pradesh - 201305, We use cookies to ensure you have the best browsing experience on our website. Anthology TV series, episodes include people forced to dance, waking up from a virtual reality and an acidic rain. After the first iteration, num will be divided by 10 and its value will be 345. Sample I/O Example 1 Input: 2 Output: 91 Explanation: The answer should be the total numbers in the range of 0 x < 100, excluding 11,22,33,44,55,66,77,88,99 Why can't sunlight reach the very deep parts of an ocean? Release my children from my debts at the time of my death, How to get the chapter letter (not the number), German opening (lower) quotation mark in plain TeX. Physical interpretation of the inner product between two quantum states, How can I define a sequence of Integers which only contains the first k integers, then doesnt contain the next j integers, and so on. There are only 2 possible moves for each button except for 4 and 6, which have 3. Given a chemical formula (given as a string), return the count of each For example, why are you checking even numbers in the given range? Does the US have a duty to negotiate the release of detained US citizens in the DPRK? 592), How the Python team is adapting the language for an AI future (Ep. Note that you can solve it with simple math - no loop required. Conclusions from title-drafting and question-content assistance experiments Why is a dedicated compresser more efficient than using bleed air to pressurize the cabin? Departing colleague attacked me in farewell email, what can I do? Is it proper grammar to use a single adjective to refer to two nouns of different genders? We will use one counter variable to calculate the total number of digits we need to remove to make it 0. An atomic element always starts with an uppercase character, then zero or more lowercase letters, representing the name. Suppose we have 7 digits in this we call function from main with 6(7-1) digits. Was the release of "Barbie" intentionally coordinated to be on the same day as "Oppenheimer"? You can try searching about top-down dynamic programming and memoization technique if you want to optimize it. Why do capacitors have less energy density than batteries? Who counts as pupils or as a student in Germany? There is no need to find explicitly all numbers that satisfy these conditions. class Solution: def countDigits(self, num: int) -> int: # Initialize a count to keep track of the number of digits that divide num count = 0 # Iterate through the digits in the integer for digit in str(num): # Check if the digit divides num if num % int(digit) == 0: # If it does, increment the count count += 1 # Return the count return count You are given K is summ of digits are in number and N is count of digits in the number. We and our partners use cookies to Store and/or access information on a device. Unfortunately, those ideas were ineffectively applied, such that the main code is still very complicated and difficult to follow. Now, we can run a check from 2 to N 1 to find how many primes lie in this range. If the traversal reaches required length then I return 1, indicating I successfully got a phone number. 592), How the Python team is adapting the language for an AI future (Ep. Empirically, what are the implementation-complexity and performance implications of "unboxed" primitives? Count the number of prime numbers less than a non-negative number, n. Input: 10 Why can I write "Please open window" without an article? 1 or more digits representing the count of that element may follow if the count is greater than 1. Making statements based on opinion; back them up with references or personal experience. python - Find count of N-digits numbers which consist of digits give you the sum is equal to K. Return count, the smallest and the largest number - Stack Overflow Find count of N-digits numbers which consist of digits give you the sum is equal to K. Return count, the smallest and the largest number Ask Question Asked 9 months ago We simple call digitNumber function with n-1 digits as first number we already find it can be 8 or 9 and simple multiply it. How feasible is a manned flight to Apophis in 2029 using Artemis or Starship? After the second iteration, the value of num will be 34 and the count is incremented to 2. By using our site, you Thank you so much! I think this challenge helped me understand my solutions don't only need to work, but need to be efficient as well. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. I tried to solve this problem from leetcode and I came up with the following code but the testcase where low = 3 and high = 7 gives 2 as an output and 3 is expected by leetcode. If Phileas Fogg had a clock that showed the exact date and time, why didn't he realize that he had arrived a day early? Asking for help, clarification, or responding to other answers. To learn more, see our tips on writing great answers. Python Ask Question Asked 7 months ago Modified 6 months ago Viewed 402 times -3 I tried to solve this problem from leetcode and I came up with the following code but the testcase where low = 3 and high = 7 gives 2 as an output and 3 is expected by leetcode. I tested on the website and it does pass all tests within the allotted time. Example 1: Input: N = 12 Output: 2 Explanation: 1 Leetcode number of atoms solution using stack, What its like to be on the Python Steering Council (Ep. Also, merely stating "it fails" is not a useful description of the problem. How difficult was it to spoof the sender of a telegram in 1890-1920's in USA? Now, we can run a check from 2 to N - 1 to find how many primes lie in this range. Connect and share knowledge within a single location that is structured and easy to search. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. /problems/count-negative-numbers-in-a-sorted-matrix/solutions/ Code Review Stack Exchange is a question and answer site for peer programmer code reviews. Math Code Solution 1: class Solution: def countDigits(self, num: int) -> int: count = [digit for digit in str(num) if num % int(digit) == 0] return len(count) Solution 2: class Solution: def countDigits(self, num: int) -> int: count = 0 for digit in str(num): if num % int(digit) == 0: count +=1 return count Previous Importing a text file of values and converting it to table. 593), Stack Overflow at WeAreDevelopers World Congress in Berlin, Temporary policy: Generative AI (e.g., ChatGPT) is banned. Find nth number that contains the digit k or divisible by k. 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