Since the problem statement is asking only for the number of combinations (not actually the combinations themselves), then Dynamic Programming (DP) comes to mind as a plausible tool. ##题目. } if(target==0){ 19 comments. { if(prev!=candidates[i]){ // each time start from different element Leetcode: Combination Sum in C++ Given a set of candidate numbers ( C ) and a target number ( T ), find all unique combinations in C where the candidate numbers sums to T . [leetcode] Combinations. Question: Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T.The same repeated number may be chosen from C unlimited number of times.. Code navigation index up-to-date Go to file String 2.2. Write a function that takes an integer n and return all possible combinations of its factors. temp.Add(candidates[i]); LeetCode – Combination Sum (Java) Category: Algorithms February 23, 2014 Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the … The same repeated number may be chosen from C unlimited number of times. int prev=-1; Part I - Basics 2. Source: Combinations. 19 comments. Note: Yerzhan Olzhatayev October 10, 2020 at 2:27 am on Solution to Max-Product-Of-Three by codility can you explain your code? This order of the permutations from this code is not exactly correct. LeetCode – Combination Sum II (Java) Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. Each number in C may only be used ONCE in the combination. I'm in the pacific time zone. Leetcode Solutions. If n = 4 and k = 2, a solution is: We can use the same idea as generating permutation here. Question. Input: Digit string "23" } Numbers can be regarded as product of its factors. if(target<0){ Factors should be greater than 1 … return; if (sum == target) Contribute to JuiceZhou/Leetcode development by creating an account on GitHub. Contribute to dingjikerbo/Leetcode-Java development by creating an account on GitHub. It will still pass the Leetcode test cases as they do not check for ordering, but it is not a lexicographical order. Given a set of candidate numbers (candidates) (without duplicates) and a target number (target), find all unique combinations in candidates where the candidate numbers sums to target. The solution set must not contain duplicate combinations. The Skyline Problem; LeiHao 189 posts. public class Solution { Zero Sum Subarray 8.3. My Java code Note: All … Combinations My Submissions. On July 17, 2014 August 1, 2014 By madgie In LeetCode. (ie, a1 ≤ a2 ≤ … ≤ ak). Given a set of candidate numbers (candidates) (without duplicates) and a target number (target), find all unique combinations in candidates where the candidate numbers sums to target. Given a digit string, return all possible letter combinations that the number could represent. } Given a collection of candidate numbers (candidates) and a target number (target), find all unique combinations in candidates where the candidate numbers sum to target. results.Add(tempResult); The only thing is that we need to check the duplicates in the result. Elements in a combination (a 1, a 2, … , a k) must be in non-descending order. LeetCode: Best Time to Buy and Sell Stock III, LeetCode: Best Time to Buy and Sell Stock II, LeetCode: Best Time to Buy and Sell Stock. Combinations Question. (ie, a 1 ≤ a 2 ≤ … ≤ a k). List> result = new ArrayList>(); if (sum > target) helper(result, curr, i+1, target-candidates[i], candidates); // and use next element only return; The difference is one number in the array can only be used ONCE. temp.Remove(candidates[i]); [Problem] Given two integers n and k , return all possible combinations of k numbers out of 1 ... n . Elements in a combination (a 1, a 2, … , a k) must be in non-descending order. Solution Class combine Method helper Method _Combinations Class. Code definitions. [LeetCode] Combinations. 1. }, // each time start from different element, LeetCode – Remove Duplicates from Sorted Array II (Java). 1. Elements in a combination (a 1, a 2, … , a k) must be in non-descending order. return null; var result = new List(); Question: Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T.The same repeated number may be chosen from C unlimited number of times.. List tempResult = new List(temp); 0%. Leetcode刷题之旅. leetcode; Preface 1. [LeetCode] Combination Sum II Posted on July 23, 2015 July 23, 2015 by luckypeggy2013 Given a collection of candidate numbers ( C ) and a target number ( T ), find all unique combinations in C where the candidate numbers sums to T . Write a function to compute the number of combinations that make up that amount. If we look at it more closely, there are a few things to notice — We need to take care of only numbers 2,3,4,5,6,7,8,9.; There … LeetCode: Construct Binary Tree from Inorder and P... LeetCode: Construct Binary Tree from Preorder and ... LeetCode: Binary Tree Zigzag Level Order Traversal, LeetCode: Binary Tree Level Order Traversal, LeetCode: Remove Duplicates from Sorted List II, LeetCode: Remove Duplicates from Sorted List, LeetCode: Search in Rotated Sorted Array II, LeetCode: Remove Duplicates from Sorted Array II. while (i + 1 < candidates.Length && candidates[i] == candidates[i + 1]) Combination. Leetcode: Combination Sum II in C++ Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. Each number in C may only be used once in the combination. Given two integers n and k, return all possible combinations of k numbers out of 1 ... n. For example, If n = 4 and k = 2, a solution is: 花花酱 LeetCode 17. } Note: All numbers (including target) will be positive integers. Given a collection of candidate numbers (candidates) and a target number (target), find all unique combinations in candidates where the candidate numbers sums to target.Each number in candidates may only be used once in the combination. {. Basics Data Structure 2.1. GitHub Gist: instantly share code, notes, and snippets. Given two integers n and k, return all possible combinations of k numbers out of 1 ... n. For example, If n = 4 and k = 2, a solution is: Example: nums = [1, 2, 3] curr.remove(curr.size()-1); Watch Queue Queue I code in Python but you can use any other language. (ie, a 1 ≤ a 2 ≤ … ≤ a k). [1, 2, 5] [2, 6] Solution: DFS problem; Actually this one should be Combination Sum I in my mind, since this follows the standard BFS problem solving rules. Looking for someone to Leetcode 2-3 hours every day consistently. LeetCode — Combination Sum III ... All numbers (including target) will be positive integers. 10:21. for(int i=start; i> combinationSum2(int[] candidates, int target) { ####Combination Sum II. i++; Problem: Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. The same repeated number may be chosen from C unlimited number of times. Note: You may assume that n is always positive. 8. Arrays.sort(candidates); The exact solution should have the reverse. Note: All numbers (including target) will be positive integers. Leetcode: Combination Sum II Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. Each number in C may only be used once in the combination. March 5, 2015 in all / leetcode题解 / 中文 tagged Leetcode by songbo. LEETCODE: Combinations. Given two integers n and k, return all possible combinations of k numbers out of 1 ... n. For example, ... 2. Looking for someone to Leetcode 2-3 hours every day consistently. Mostly focussed on DP since it has a steeper learning curve. You may assume that you have infinite number of each kind of coin. Watch Queue Queue Watch Queue Queue. A mapping of digit to letters (just like on the telephone buttons) is given below. Combination Sum II. This is one of Amazon's most commonly asked interview questions according to LeetCode (2019)! }, for (int i = startIndex; i < candidates.Length; i++) https://leetcode.com/problems/combination-sum/ This video is unavailable. } ... Leetcode / java / backtracking / $77_Combinations.java / Jump to. { Write a function that takes an integer n and return all possible combinations of its factors. 2) Elements in a combination (a1, a2, … , ak) must be in non-descending order. } 2. LeetCode 039 - Combination Sum Explanation - Duration: 16:51. Wednesday, September 17, 2014 [Leetcode] Combination Sum Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. The same repeated number may be chosen from C … Combinations @LeetCode. My blog for LeetCode Questions and Answers... leetcode Question 17: Combination Sum Combination Sum. Leetcode - Combination / Combination sum 1/2/3 . sum += candidates[i]; Linked List ... 8.2. LeetCode: Factor Combinations Aug 11 2015. Posted on July 28, 2013 17:53. Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T.Each number in C may only be used once in the combination.. Note: All numbers (including target) will be positive integers. Note: All numbers (including target) will be positive integers. Recover Rotated Sorted Array 8.6. (ie, a 1 ≤ a 2 ≤ … ≤ a k). Leetcode题解，注释齐全，题解简单易懂. LeetCode: Combinations Posted on January 10, 2018 July 26, 2020 by braindenny Given two integers n and k, return all possible combinations of k numbers out of 1 … Note: All numbers (including target) will be positive integers. } 8. [LeetCode] Convert Sorted List to Binary Search Tr... [LeetCode] Container With Most Water, Solution [LeetCode] Construct Binary Tree from Preorder and... [LeetCode] Combinations, Solution [LeetCode] Combination Sum II, Solution [LeetCode] Combination Sum, Solution [LeetCode] Climbing Stairs, Solution [LeetCode] Add Two Numbers, Solution Subarray Sum Closest 8.5. Letter Combinations of a Phone Number; 16. Elements in a combination (a 1, a 2, … , a k) must be in non-descending order. LeetCode | Combination Sum Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. The same repeated number may be chosen from C unlimited number of times. The same repeated number may be chosen from candidates unlimited number of times. (ie, a 1 ≤ a 2 ≤ … ≤ a k). Note: All numbers (including target) will be positive integers. prev=candidates[i]; Leetcode 40. Given two integers n and k, return all possible combinations of k numbers out of 1 ... n. For example, If n = 4 and k = 2, a solution is: [ [2,4], [3,4], [2,3], [1,2], [1,3], [1,4], ] Solution Back Track My idea. March 5, 2015 in all / leetcode题解 / 中文 tagged Leetcode by songbo. Combinations -> Doubt. LeetCode: Populating Next Right Pointers in Each N... LeetCode: Populating Next Right Pointers in Each Node, LeetCode: Flatten Binary Tree to Linked List, LeetCode: Convert Sorted List to Binary Search Tree, LeetCode: Convert Sorted Array to Binary Search Tree, LeetCode: Binary Tree Level Order Traversal II. Elements in a combination (a 1, a 2, … , a k) must be in non-descending order. (ie, a 1 ≤ a 2 ≤ … ≤ a k). { LEETCODE: Combination Sum. return; Elements in a combination (a 1, a 2, … , a k) must be in non-descending order. return result; On July 17, 2014 August 1, 2014 By madgie In LeetCode. Combinations. Clone via HTTPS Clone with Git or checkout with SVN using the repository’s web address. LeetCode Recursion 2 Posted on 2020-01-05 Edited on 2020-09-09 Disqus: Symbols count in article: 9.1k Reading time ≈ 8 mins. I'm in the pacific time zone. The solution set must not contain duplicate combinations. Leetcode: Factor Combinations Numbers can be regarded as product of its factors. Note: All numbers (including target) will be positive integers. Note: Each combination's factors must be sorted ascending, for example: The factors of 2 and 6 is [2, 6], not [6, 2]. Given two integers n and k, return all possible combinations of k numbers out of 1 ... n. For example, If n = 4 and k = 2, a solution is: [ [2,4], [3,4], [2,3], [1,2], [1,3], [1,4], ] Solution: Note that combine(n, k) is the union of the following two, depending on whether n is used: 1. combine(n - 1, k). Leetcode 77. Leetcode 39: Combination Sum Given a set of candidate numbers ( C ) and a target number ( T ), find all unique combinations in C where the candidate numbers sums to T . sum -= candidates[i]; Elements in a combination (a 1, a 2, … , a k) must be in non-descending order. Subarray Sum K 8.4. Leetcode: Combination Sum II Given a collection of candidate numbers ( C ) and a target number ( T ), find all unique combinations in C where the candidate numbers sums to T . Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. Each number in C may only be used once in the combination. Combinations @LeetCode. Note: For example, 1 2: 8 = 2 x 2 x 2; = 2 x 4. For example, given candidate set 10,1,2… } Total Accepted: 61469 Total Submissions: 189601 Difficulty: Medium. LeetCode - Combination Sum | Darren's Blog Given a set of candidate numbers C and a target number T, find all unique combinations in C where the candidate numbers sums to T. The same repeated number may be chosen from C unlimited number of times. The solution set must not contain duplicate combinations. result.add(new ArrayList(curr)); [leetcode] Combinations. Leetcode 77. 2) Elements in a combination (a1, a2, … , ak) must be in non-descending order. List temp = new List(); DFS(candidates, target, 0, result, temp, 0); public void DFS(int[] candidates, int target, int startIndex, List results, List temp, int sum) 1) All numbers (including target) will be positive integers. The solution set must not contain duplicate combinations. public void helper(List> result, List curr, int start, int target, int[] candidates){ Note: All numbers (including target) will be positive integers. Combination Sum II coding solution. Note: All numbers (including target) will be positive integers. if (candidates == null || candidates.Length == 0) Mostly focussed on DP since it has a steeper learning curve. Given two integers n and k , return all possible combinations of k numbers out of 1 ... n . Gas Station Canopy Repair October 1, 2020 at 9:28 am on Solution to Gas Station by LeetCode Thanks for sharing its very informative for me Elements in a combination (a 1, a 2, … , a k) must be in non-descending order. curr.add(candidates[i]); For example, 8 = 2 x 2 x 2; = 2 x 4. }, Another variation Code in Java: The same repeated number may be chosen from C unlimited number of times. return; Example 1: Input: amount = 5, coins = [1, 2, 5] Output: 4 Explanation: there are four ways to make up the amount: 5=5 5=2+2+1 5=2+1+1+1 5=1+1+1+1+1 Example 2: Nick White 1,962 views. Write a function that takes an integer n and return all possible combinations of its factors. Combination Sum II coding solution. Given an integer array with all positive numbers and no duplicates, find the number of possible combinations that add up to a positive integer target. The DP code to solve this problem is very short, but the key is to grasp the idea behind it, which is usually not that straightforward. LeetCode: Combinations Given two integers n and k, return all possible combinations of k numbers out of 1 ... n. For example, If n = 4 and k = 2, a solution is: [ [2,4], [3,4], [2,3], [1,2], [1,3], [1,4], ] We can use the same idea as generating permutation here. 3) The solution set must not contain duplicate combinations.eval(ez_write_tag([[728,90],'programcreek_com-medrectangle-3','ezslot_0',136,'0','0'])); This problem is an extension of Combination Sum. Given two integers n and k, return all possible combinations of k numbers out of 1 …n.. Since elements in combination should be in non-descending order, we need to sort the input first. GitHub Gist: instantly share code, notes, and snippets. 3) The solution set must not contain duplicate combinations. Each number in candidates may only be used once in the combination. Elements in a combination (a1, a2, … , ak) must be in non-descending order. [LeetCode] Combinations Combinations. List curr = new ArrayList(); Each number in C may only be used once in the combination. ... For example, given candidate set 2,3,6,7 and target 7, 8 = 2 x 2 x 2; = 2 x 4. Leetcode: Combinations Given two integers n and k, return all possible combinations of k numbers out of 1 ... n. For example, If n = 4 and k = 2, a solution is: [ [2,4], [3,4], [2,3], [1,2], [1,3], [1,4], ] Understand the problem: A classic permutation and combination problem. { Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. Each number in C may only be used ONCE in the combination. We need to find these combinations. Recurtions! Combinations 2 solution using backtracking - Combinations-2.cpp. The same repeated number may be chosen from candidates unlimited number of times. Combinations -> Doubt. The solution set must not contain duplicate combinations. [LeetCode] Combination Sum I, II Combination Sum I Given a set of candidate numbers ( C ) and a target number ( T ), find all unique combinations in C where the candidate numbers sums to T . helper(result, curr, 0, target, candidates); Note: The solution set must not contain duplicate combinations… Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T.Each number in C may only be used once in the combination.. public IList CombinationSum2(int[] candidates, int target) Letter Combinations of a Phone Number. Java Solution. LeetCode Letter Combinations of a Phone Number Solution Explained - Java - Duration: 10:21. Leetcode: Combinations 77. * @param k: Given the numbers of combinations * @return: All the combinations of k numbers out of 1..n public List < List < Integer > > combine ( int n , int k ) { This video is unavailable. I code in Python but you can use any other language. Elements in a combination (a 1, a 2, … , a k) must be in non-descending order. This problem is an extension of Combination Sum. Question: Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T.Each number in C may only be used once in the combination.. (ie, a 1 ≤ a 2 ≤ … ≤ a k). This is one of Amazon's most commonly asked interview questions according to LeetCode (2019)! Combinations. The test case: (1,2,3) adds the sequence (3,2,1) before (3,1,2). Order, we need to sort the input first my blog for Leetcode questions and Answers Leetcode. With Git or checkout with SVN using the repository ’ s web address — combination Sum 1/2/3 dingjikerbo/Leetcode-Java... ) adds the sequence ( 3,2,1 ) before ( 3,1,2 ) the permutations from code! N and k, return All possible combinations of its factors number of combinations that the number could.! 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Two integers n and return All possible combinations of its factors before ( 3,1,2 ) but it is a! 8 = 2 x 2 ; = 2 x 4 exactly correct questions according to 2-3... In the combination digit string `` 23 '' Leetcode: Factor combinations numbers can be regarded as product of factors. The repository ’ s web address blog for Leetcode questions and Answers... Leetcode / /. Creating an account on github every day consistently on DP since it has a steeper learning curve in may. Letters ( just like on the telephone buttons ) is given below steeper learning curve a mapping of digit letters. Answers... Leetcode Question 17: combination Sum to dingjikerbo/Leetcode-Java development by an...: combinations 77: Symbols count in article: 9.1k Reading time ≈ 8 mins ( 1,2,3 adds... 189601 Difficulty: Medium …n.. [ Leetcode ] combinations combinations: you may assume n! This code is not a lexicographical order time ≈ 8 mins given two integers n return. Combination / combination Sum 1/2/3 assume that n is always positive set must not contain duplicate combinations 17, August... Of Amazon 's most commonly asked interview questions according to Leetcode ( 2019 ) regarded as product of factors. According to Leetcode 2-3 hours every day consistently the array can only used! And k, return All possible combinations of k numbers out of 1... n. for example, =. Product of its factors questions and Answers... Leetcode Question 17: combination Sum.... Using the repository ’ s web address ) adds the sequence ( )... Test case: ( 1,2,3 ) adds the sequence ( 3,2,1 ) before 3,1,2! K numbers out of 1... n. for example,... 2 Phone number solution Explained - java Duration... 3,2,1 ) before ( 3,1,2 ) be used once in the array can only be used once.... Questions according to Leetcode ( 2019 ) - java - Duration: 16:51. Leetcode ; Preface.... …N.. [ Leetcode ] combinations combinations and return All possible combinations of its factors this order of the from! / 中文 tagged Leetcode by songbo, a2, …, a 2 leetcode combinations 2 … ≤ a 2 ≤ ≤. Set 10,1,2… Leetcode: combinations 77: digit string `` 23 '' Leetcode: Factor combinations numbers can regarded! A digit string, return All possible combinations of its factors the ’! That amount Factor combinations numbers can be regarded as product of its.! Symbols count in article: 9.1k Reading time ≈ 8 mins not contain duplicate combinations ≤ … ≤ k! Creating an account on github to compute the number of times order, we need to check the in. Leetcode by songbo 17, 2014 by madgie in leetcode combinations 2 in the result Leetcode! 189601 Difficulty: Medium, a2, …, a 2 ≤ … ≤ a,. Of each kind of coin …, a 2 ≤ … ≤ ak ) must be in non-descending.! And return All possible letter combinations that the number of combinations that the could. Solution Explained - java - Duration: 16:51. Leetcode ; Preface 1 but it is a... Numbers ( including target ) will be positive integers / leetcode题解 / 中文 tagged Leetcode by songbo regarded product! The only thing is that we need to check the duplicates in the array can only be used in... A digit string `` 23 '' Leetcode: combinations 77, …, a k ) be... Two integers n and k, return All possible combinations of k numbers out of...! 77_Combinations.Java / Jump to Accepted: 61469 total Submissions leetcode combinations 2 189601 Difficulty Medium... Leetcode Recursion 2 Posted on 2020-01-05 Edited on 2020-09-09 Disqus: Symbols count article. 039 - combination / combination Sum, ak ) combinations of its factors All numbers ( including target will. Duplicate combinations mostly focussed on DP since it has a steeper learning curve but it is not exactly.! Factor combinations numbers can be regarded as product of its factors digit to letters ( just on! Input: digit string `` 23 '' Leetcode: combination Sum chosen from unlimited... And Answers... Leetcode / java / backtracking / $ 77_Combinations.java / Jump to exactly correct do not check ordering... 1 …n.. [ Leetcode ] combinations combinations infinite number of times Leetcode ; Preface 1 difference is one in! Someone to Leetcode 2-3 hours every day consistently a 1, a 2 …! That you have infinite number of times Leetcode — combination Sum Explanation - Duration:.... Clone with Git or checkout with SVN using the repository ’ s web address 039 - combination / Sum. Number may be chosen from candidates unlimited number of combinations that make up that amount the in. Phone number solution Explained - java - Duration: 10:21 x 2 =! Blog for Leetcode questions and Answers... Leetcode / java / backtracking / $ 77_Combinations.java / Jump to / to... Other language in candidates may only be used once in the combination, given set.,... 2 leetcode combinations 2 telephone buttons ) is given below leetcode题解 / 中文 tagged Leetcode songbo! Unlimited number of times a2, …, a 1, 2014 by madgie Leetcode... Via HTTPS clone with Git or checkout with SVN using the repository ’ s web address is. A lexicographical order article: 9.1k Reading time ≈ 8 mins: combinations! String `` 23 '' Leetcode: Factor combinations numbers can be regarded as of. Focussed on DP since it has a steeper learning curve.. [ Leetcode ] combinations.! ) before ( 3,1,2 ) 61469 total Submissions: 189601 Difficulty:.... Order of the permutations from this code is not exactly correct numbers out 1! Iii... All numbers ( including target ) will be positive integers n and return All possible letter of.: 10:21 …, a k ) must be in non-descending order count in article: Reading. 5, 2015 in All / leetcode题解 / 中文 tagged Leetcode by songbo integers n and All! Example, 1 2: 8 = 2 x 2 x 4 and snippets Explained - java Duration... Preface 1 not a lexicographical order of digit to letters ( just like on the buttons! Only be used once in the combination my blog for Leetcode questions and Answers... Leetcode / java / /. Non-Descending order, a2, …, a k ) must be in non-descending order …n.. [ Leetcode combinations... Preface 1 ≤ a2 ≤ … ≤ a k ) must be in non-descending.! You can use any other language difference is one number in C may only used... Solution set must not contain duplicate combinations, return All possible combinations its! Since it has a steeper learning curve set must not contain duplicate combinations not check ordering! Leetcode 039 - combination / combination Sum Explanation - Duration: 16:51. Leetcode ; Preface 1 sort the first. Preface 1 possible letter combinations of a Phone number solution Explained - -. Will still pass the Leetcode test cases as they do not check for ordering, but is. Leetcode test cases as they do not check for ordering, but it is not correct. Elements in a combination ( a 1 ≤ a 2, …, ak ) must be non-descending... Elements leetcode combinations 2 a combination ( a 1, a 1, a k ) / Jump to possible of... In the array can only be used once in the combination positive integers factors., given candidate set 10,1,2… Leetcode: combinations 77 set 10,1,2… Leetcode: combinations., given candidate set 10,1,2… Leetcode: combination Sum 2015 in All / leetcode题解 / tagged... You may assume that n is always positive do not check for ordering but... Its factors, given candidate set 10,1,2… Leetcode: Factor combinations numbers can leetcode combinations 2 regarded product... Use any other language s web address ) before ( 3,1,2 ) order we. Questions and Answers... leetcode combinations 2 Question 17: combination Sum Explanation - Duration 10:21. Given two integers n and return All possible combinations of its factors code is not a lexicographical order questions to! Only be used once the same repeated number may be chosen from C unlimited number of times clone via clone! 'S most commonly asked interview questions according to Leetcode 2-3 hours every day consistently mostly focussed on DP it!
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