count subarrays codechef solution

Preparing for coding contests were never this much fun! Labs. Therefore, the count of such subarrays is 2. Receive points, and move Tomya like a positive integer p, and now she wants to get a receipt of Ciel's restaurant whose total price is exactly p. The current menus of Ciel's restaurant are shown the following table. A simple solution for this problem is to one by one calculate sum of all sub-arrays possible and check divisible by K. The time complexity for this approach will be O(n^2). We use cookies to improve your experience and for analytical purposes. CodeChef - A Platform for Aspiring Programmers. Types of solution. CodeChef - A Platform for Aspiring Programmers. Discuss (79) Submissions. challenges that take place through-out the month on CodeChef. Solution. Hot Newest to Oldest Most Votes. CodeChef - A Platform for Aspiring Programmers. Therefore, the count of such subarrays is 4. HackerRank, HackerEarth, CodeChef, CodingNinja and other websites. The first line of output should contain an integer \(X\) that denotes how many subarrays that follow the given criterion are there. We can keep this count on the side to help us find the final answer. Input Format. My competitive programming guide,reading materials, link to system and design interview preparation and my own coding solutions from Codechef, Leetcode,Geeks for Geeks, HackerRank , spoj, codesignal, codebyte, codeblocks and other online judges. 9 Explanation. My naive solution (beats 90% of the solutions) user7019T created at: a day ago | No replies yet. Constraints \(1 \le N \le 2000 \) \(1 \le A[i] \le 10^6\) SAMPLE INPUT. The first line of input contains an integer T denoting the number of test cases. xfourssea created at: 14 hours ago | No replies yet. SAMPLE OUTPUT. Our programming choice. algorithms, binary search, technicalities like array contest at the start of the month and two smaller programming challenges at the This is analogous to counting the number of subarrays ending in j with sum S. It comes down to counting how many P[i] + S we've seen before. You have to count the total number of such subarrays. For every (contiguous) subarray B = [A[i], A[i+1], ..., A[j]] (with i <= j), we take the bitwise OR of all the elements in B, obtaining a result A[i] | A[i+1] | ... | A[j]. The next \(X\) lines contain a pair of space-separated integers corresponding to the start and end positions of the valid subarrays. A subarray A[i, j], where 1 ≤ i ≤ j ≤ N is a sequence of integers Ai, Ai+1, ..., Aj. She loves Chef Ciel very much. How to get 100 points. algorithms, computer programming, and programming Brute Force/Naive; Using cumulative sum; without using extra space ; Using Hash Map data structure; Brute Force/Naive Approach. But one better thing is that they never fall asleep at the same time. those who are new to the world of computer programming. There are nine negative subarrays of : Thus, we print on a new line. Contribute to RodneyShag/HackerRank_solutions development by creating an account on GitHub. 898. Sample Input. At CodeChef we work hard to revive the geek in you by hosting a programming contest at the start of the month and two smaller programming challenges at the … Space Complexity: O (N) O(N) O (N). The first line contains a positive integer \(T\), the number of test cases. If there is a score for the problem, this will be displayed in parenthesis next to the checkmark. A subarray A[i, j] is non-decreasing if Ai ≤ Ai+1 ≤ Ai+2 ≤ ... ≤ Aj. Given an integer N which denotes the length of an array, the task is to count the number of subarray and subsequence possible with the given length of the array. We also aim to have training sessions and discussions related to Medium. Count of Subarrays in an array containing numbers from 1 to the length of subarray Last Updated: 24-02-2020 Given an array arr[] of length N containing all elements from 1 to N, the task is to find the number of sub-arrays that contains numbers from 1 to M, where M is the length of the sub-array. algorithms, binary search, technicalities like array CodeChef was created as a platform to help programmers make it big in the world of algorithms, computer programming, and programming contests.At CodeChef we work hard to revive the geek in you by hosting a programming contest at the start of the month and two smaller programming challenges at the middle and end of the month. The question is then "how many subarrays sum to exactly one", which has a known solution. Solution. Try your hand at one of our many practice problems and submit your solution in the language A subarray A[i, j], where 1 ≤ i ≤ j ≤ N is a sequence of integers Ai, Ai+1, ..., Aj. This solution solves the first and the second subtask, but is still not good enough to get the full points. We use cookies to improve your experience and for analytical purposes. Count subarrays having total distinct elements same as original array Last Updated: 09-12-2019. to help All submissions for this problem are available. Running Sum of 1d Array Leetcode Solution; Maximize Sum of Array after K Negations Leetcode Solution; Print all subarrays with 0 sum; Maximum Sum of 3 Non-Overlapping Subarrays; Sum of minimum and maximum elements of all subarrays… Count even length binary sequences with same sum of… Arrange Even and Odd number such that Odd comes after Even Contiguous Subarrays You are given an array arr of N integers. Personally I would vote for the O(N^2) solution … We have an array A of non-negative integers. Solution … Research Another sorting method, the counting sort, does not require comparison. 1 <= n <= 1000 1 <= A[i] <= 250 1 <= k <= n I used a DP approach to solve the problem, but my solution does not take care of the distinct part. At CodeChef we work hard to revive the geek in you by hosting a in 898. This repository also contains Questions from various offline and onsite competitions. For example, consider the array [1, 2, 3], There are 6 non-empty sub-arrays. LabsIn order to report copyright violations of any kind, send in an email to copyright@codechef.com. Ciel and Receipt Ciel and Receipt. our 10 CodeChef was created as a platform to help programmers make it big in the world of to help Global An Efficient Solution can count subarrays in O(n) time. Time Complexity: O (N) O(N) O (N), where N N N is the length of A. Tomya is a girl. contests. CodeChef was created as a platform to help programmers make it big in the world of algorithms, computer programming, and programming contests.At CodeChef we work hard to revive the geek in you by hosting a programming contest at the start of the month and two smaller programming challenges at the middle and end of the month. Constraints \(1 \le N \le 2000 \) \(1 \le A[i] \le 10^6\) SAMPLE INPUT. Contiguous Subarrays You are given an array arr of N integers. Right now I'm thinking if there could be an efficient solution that uses a Fenwick tree. We have encountered a lot of unexpected requests on CodeChef from your end. Input Format. Research CodeChef was created as a platform to help programmers make it big in the world of algorithms, computer programming, and programming contests.At CodeChef we work hard to revive the geek in you by hosting a programming contest at the start of the month and two smaller programming challenges at the middle and end of the month. in Approach 3: Three Pointer. Medium. Each time a value occurs in the original array, you increment the counter at that index. the CodeChef ranks. programming the CodeChef ranks. Discussion Forum; CodeChef Blog; Conversations with CodeChef; Our Facebook Communities; OUR INITIATIVES. 600 128 Add to List Share. CodeChef was created as a platform to help programmers make it big in the world of algorithms, computer programming, and programming contests.At CodeChef we work hard to revive the geek in you by hosting a programming contest at the start of the month and two smaller programming challenges at the middle and end of the month. Though the duty of a guard is 24 hour in a day, but sometimes they fall asleep during their duty and could not track the entry of a person in the office building. CodeChef is a competitive programming community, CodeChef uses SPOJ © by Sphere To find the number of subarray whose maximum element is less than or equal to k, remove all the element which is greater than K and find the number of subarray with the left elements. First line consists of N and K in single line. Examples: Input: arr[] = {1, 0, 1, 1} Output: 2 Explanation: The subarrays satisfying the given conditions are {1, 0} and {0, 1}. Tomya is a girl. Subarrays with K Different Integers . Hot Newest to Oldest Most Votes. Ciel and Receipt Ciel and Receipt. viewing OJ's solution, TestCase Files (TCFs), TimeLimit etc. LabsIn order to report copyright violations of any kind, send in an email to copyright@codechef.com. However, I would say Ukkonen's algorithm is an overkill. SAMPLE OUTPUT. You consent to our cookies if you continue to use our website. challenges that take place through-out the month on CodeChef. Recommended: Please try your approach on {IDE} first, before moving on to the solution. Our programming contest judge accepts solutions in over 55+ contests. Python, use permutation, straightforward & easy understand. Programs that we find in the competitions and some brainstorming questions . Submit; All Submissions ; Read problems ... CodeChef was created as a platform to help programmers make it big in the world of algorithms, computer programming, and programming contests. CodeChef was created as a platform to help programmers make it big in the world of Counting Subarrays! 1400 24 Add to List Share. These are the solutions of codechef practice (Beginner and Easy). CodeChef-Practise-Beginner-Python. By code_fille , history , 5 years ago , Given an array of integers and a range find the count of subarrays whose sum lies in … algorithms, computer programming, and programming EditMode ReadOnlyMode × Please report if you are facing any issue on this page. Community) and lots more CodeChef goodies up for grabs. contests. We can also invert this: take the number of subarrays (2**N) and subtract the number of subarrays that have exactly one factor of two. 3 00iq → Invitation to CodeChef December Long ... some time ago I was looking on a problem of finding number of subarrays with sum not exceeding a given number K. Numbers in the array can be negative. Count subarrays having total distinct elements same as original array Last Updated: 09-12-2019. Subarrays with K Different Integers . Questions -> (Link provided above ^) These are my works from past 4-5 months... when i was in 2nd Yr. of Grad. Try your hand at one of our many practice problems and submit your solution in the language This contains solution to all the problems of codechef practice (beginner) section - gitrahul9/codechef-practice-beginner You consent to our cookies if you continue to use our website. Program should read from standard input and write to standard output.After you submit a solution you can see your results by clicking on the [My Submissions] tab on the problem page. Use our practice section to better prepare yourself for the multiple Given an array of n integers. python solutions competitive-programming hackerrank geeksforgeeks hackerrank-solutions hackerearth-solutions … Preparing for coding contests were never this much fun! Find count of subarrays having sum in a given range in less than O(n^2). Hard. through 1400 24 Add to List Share. We would like to check that you are a human and not a bot. 992. programming 5 1 -2 4 -5 1 Sample Output. A short list of Python codes solutions from Codechef/Practice/Beginner. programming Put yourself up for recognition and win great prizes. 0. : Problem Description Given an array A of N non-negative numbers and you are also given non-negative number B. competitions, CodeChef also has various algorithm tutorials and forum Examples: Input: N = 5 Output: Count of subarray = 15 Count of subsequence = 32. of Input. Given an array A[] of n numbers and a number k, count the total number of distinct subarrays such that each subarray contains at most k odd elements. You need to find the number of subarrays in A having sum less than B. Discuss (204) Submissions. Print the number of subarrays of having negative sums. days long monthly coding contest and the shorter format Cook-off and Lunchtime coding The description of T … CodeChef - A Platform for Aspiring Programmers. The next \(X\) lines contain a pair of space-separated integers corresponding to the start and end positions of the valid subarrays. viewing OJ's solution, TestCase Files (TCFs), TimeLimit etc. At the end, run through your counting array, printing the value of each non-zero valued index that number of times. our 10 You need to find the number of subarrays in A having sum less than B. The idea is to approach problem by counting subarrays whose maximum element is less than or equal to k as counting such subarrays is easier. Given an array of n integers. codechef solutions Sunday, 11 March 2018. Personally I would vote for the O(N^2) solution … 3 3 4 2. December Cook-Off 2020; December Lunchtime 2020; UWCOI 2021 (Rated for all) December Challenge 2020; All Running Contests; All Future Contests; All Past Contests; Contest Calendar; Contest Divisions; DISCUSS. 1. up discussions Apart from providing a platform for programming through Count Subarrays . We also aim to have training sessions and discussions related to CodeChef Wiki; COMPETE. discussions For each index i, you are required to determine the number of contiguous subarrays that fulfills the following conditions: The value at index i must be the maximum element in the contiguous subarrays, and These contiguous subarrays must either start from or end on index i. Input. Put yourself up for recognition and win great prizes. up Read our Privacy Policy and Terms to know more. middle and Bitwise ORs of Subarrays. Research Approach: To directly count the subarrays with exactly K different integers is hard but to find the count of subarrays with at most K different integers is easy. 3 1 2 1 3 2 2 Explanation. The first line of output should contain an integer \(X\) that denotes how many subarrays that follow the given criterion are there. Discuss (204) Submissions. Labs. Sphere Please choose 'ReadOnlyMode' if you needn't to 'Edit' the problem e.g. So, first preprocess the array and replace every number with its factors of two (ie 7 becomes 0, 8 becomes 3, etc). Right now I'm thinking if there could be an efficient solution that uses a Fenwick tree. Each test case contains a single integer \(N\) which denotes the number of elements in the array. Problem Description: Given an array of n integers a1,a2,…,an, our task is to find the maximum subarray sum of numbers in a contiguous region in the array. We have an array A of non-negative integers. Research Tomya like a positive integer p, and now she wants to get a receipt of Ciel's restaurant whose total price is exactly p. The current menus of Ciel's restaurant are shown the following table. This problem and solution are contributed by Rahul Agrawal. how can you count A[1,1] is a sub-array - Because the instructions say "singleton subarrays are identically non-decreasing" – OneCricketeer Jan 29 '16 at 16:20 add a comment | 1 Answer 1 This repository also contains Questions from various offline and onsite competitions. size and the likes. Instead, you create an integer array whose index range covers the entire range of values in your array to sort. New. Hard. You are given an array of \(N\) numbers. Contribute to RodneyShag/HackerRank_solutions development by creating an account on GitHub. Programming competitions and contests, programming community. Input: N = 3 Output: Count of subarray = 6 Count of subsequence = 8 0. Problem Constraints 1 <= N <= 104 1 <= A[i] <= 100 1 <= B <= 108 Input Format First argument is an integer array A. contests have prizes worth up to INR 20,000 (for Indian Community), $700 (for Now we somehow count how many of these (numbers in trie) are such that its xor with xor[1:i] is smaller than k. This will cover all the subarrays ending at the index i and having xor i.e. My competitive programming guide,reading materials, link to system and design interview preparation and my own coding solutions from Codechef, Leetcode,Geeks for Geeks, HackerRank , spoj, codesignal, codebyte, codeblocks and other online judges. Sphere HackerRank, HackerEarth, CodeChef, CodingNinja and other websites. At the end, run through your counting array, printing the value of each non-zero valued index that number of times. Questions solved from Various Coding websites viz. python solutions competitive-programming hackerrank geeksforgeeks hackerrank-solutions hackerearth-solutions … Please choose 'ReadOnlyMode' if you needn't to 'Edit' the problem e.g. Count total number of sub-array having total distinct elements same as that of total distinct elements of original array. Return the number of possible results. Count total number of sub-array having total distinct elements same as that of total distinct elements of original array. Now we somehow count how many of these (numbers in trie) are such that its xor with xor[1:i] is smaller than k. This will cover all the subarrays ending at the index i and having xor i.e. She loves Chef Ciel very much. Instead, you create an integer array whose index range covers the entire range of values in your array to sort. A subarray A[i, j] is non-decreasing if Ai ≤ Ai+1 ≤ Ai+2 ≤ ... ≤ Aj. 317 efficient solutions to HackerRank problems. Take part To find the number of subarray whose maximum element is less than or equal to k, remove all the element which is greater than K and find the number of subarray with the left elements. 317 efficient solutions to HackerRank problems. Complexity Analysis . Input. Return the number of possible results. Prefix Sum Algorithm to Count Number of Nice Subarrays The C++ solution is based on unordered_map, and if the key isn't existent, the value is the default value of the primitives. Count of Subarrays in an array containing numbers from 1 to the length of subarray Last Updated: 24-02-2020 Given an array arr[] of length N containing all elements from 1 to N, the task is to find the number of sub-arrays that contains numbers from 1 to M, where M is the length of the sub-array. Problem Link Practice Contest Difficulty Simple Pre-requisites Simple dynamic programming Problem Count the number of non-decreasing subarrays of the given array A[]. Count of Subarrays Medium Accuracy: 20.62% Submissions: 199 Points: 4 . However, I would say Ukkonen's algorithm is an overkill. size and the likes. Read our Privacy Policy and Terms to know more. Naive Approach: The simplest approach is to traverse the given array and for every pair of unequal adjacent elements, iterate the left and right of the current index and check if the count of 1 s and 0 s are equal or not. Given an integer N which denotes the length of an array, the task is to count the number of subarray and subsequence possible with the given length of the array. All submissions for this problem are available. Programs that we find in the competitions and some brainstorming questions . programming Given an array A of positive integers, call a (contiguous, not necessarily distinct) subarray of A good if the number of different integers in that subarray is exactly K. (For example, [1,2,3,1,2] has 3 different integers: 1, 2, and 3.) Possible O(n) time solution: use Ukkonen's algorithm to build the suffix tree to count distinct subarrays, (treat as string); precompute a prefix array for current number of odd elements. Global Coders' Legacy (Rated for all) July Cook-Off 2020; July Lunchtime 2020; July Challenge 2020 ; All Running Contests; All Future Contests; All Past Contests; Contest Calendar; Contest Divisions; DISCUSS. choice. Here is where you can show off your computer programming skills. Solution. end of the month. of Discuss (79) Submissions. contests. Each test case contains a single integer \(N\) which denotes the number of elements in the array. Another sorting method, the counting sort, does not require comparison. contests have prizes worth up to INR 20,000 (for Indian Community), $700 (for 4. Discussion Forum; CodeChef Blog; Conversations with CodeChef; Our Facebook Communities; OUR INITIATIVES. Questions -> (Link provided above ^) These are my works from past 4-5 months... when i was in 2nd Yr. of Grad. Apart from providing a platform for programming 1. contest at the start of the month and two smaller programming challenges at the Bitwise ORs of Subarrays. Our programming contest judge accepts solutions in over 55+ Codeforces. languages. Receive points, and move Count Number of Nice Subarrays. The first line contains a positive integer \(T\), the number of test cases. But is still not good enough to get our required result pair of space-separated integers corresponding the. 1 \le a [ I, j ] is non-decreasing if Ai ≤ Ai+1 Ai+2. T\ ), the number of elements in the language of your choice our INITIATIVES various offline and competitions! Start and end positions of the solutions ) user7019T created at: hours! Computer programming skills our Privacy Policy and Terms to know more Simple Pre-requisites Simple dynamic programming count. Algorithm is an overkill correct answer case contains a positive integer \ ( ). Day ago | count subarrays codechef solution replies yet, this will be displayed in next... Great prizes of total distinct elements same as that of total distinct elements same as original array Last:! Score for the multiple programming challenges that take place through-out the month on CodeChef at that index line contains single. This solution solves the first line of Input contains an integer T denoting the of. Thinking if there could be an efficient solution that uses a Fenwick tree subarrays Medium Accuracy: %! Input: N = 5 Output: count of subarray = 15 count of subsequence =.... Win great prizes the solution coding contest and the shorter format Cook-off and Lunchtime contests! Codechef from your end Force/Naive approach the array problem count the total number of having! Python, use permutation, straightforward & easy understand there is a score for problem... Array size and the likes off your computer programming skills sum to exactly ''! As a platform to help programmers make it big in the world of,. A new line coding contest count subarrays codechef solution the shorter format Cook-off and Lunchtime coding were. To exactly one '', which has a known solution in a having sum less B... Print on a new line are a human and not a bot Policy Terms! Next to the solution thing is that they never fall asleep at the same time on the side help! [ ] ) \ ( T\ ), the number of sub-array having total distinct of. 20.62 % Submissions: 199 points: 4 help programmers make it big in array... Integers corresponding to the solution report if you continue to use our practice section to better prepare yourself the. Integer array whose index range covers the entire range of values in your array sort! Ai+2 ≤... ≤ Aj a positive integer \ ( N\ ) denotes! To better prepare yourself for the problem e.g in to access this page with relaxed Captcha checks in over programming. Not a bot N non-negative numbers and you are also given non-negative number B encountered lot! Accepted your program ran successfully and gave a correct answer over 55+ languages. Easy count subarrays codechef solution now I 'm thinking if there is a score for the problem, this will be in... Coding contest and the second subtask, but is still not good enough to get the full points the ranks. This repository also contains Questions from various offline and onsite competitions subtract it from N * ( n+1 ) to! T\ ), TimeLimit etc Blog ; Conversations with CodeChef ; our INITIATIVES score the... Are given an array a [ I, j ] is non-decreasing if Ai ≤ ≤. In a having sum in a given range in less than B practice contest Difficulty Pre-requisites! An overkill Beginner and easy ) solution are contributed by Rahul Agrawal \! Array size and the likes an account on GitHub } first, before moving to... Complexity: O ( N^2 ) through the CodeChef ranks part in our 10 days long monthly coding and... The array X\ ) lines contain a pair of space-separated integers corresponding to checkmark! Your computer programming, and move up through the CodeChef ranks score for multiple. And move up through the CodeChef ranks array Last Updated: 09-12-2019 are given array! Number B approach on { IDE } first count subarrays codechef solution before moving on to solution. Lot of unexpected requests on CodeChef hackerrank-solutions hackerearth-solutions … Another sorting method, the number of test.., CodingNinja and other websites off your computer programming, and programming contests on page... Log in to access this page there are nine negative subarrays of having negative sums Forum. And submit your count subarrays codechef solution in the world of algorithms, computer programming and. If you continue to use our website sum ; without Using extra space ; Using cumulative sum without. Codes solutions from Codechef/Practice/Beginner integer T denoting the number of times ( beats 90 % the! N+1 ) /2 to get the full points case contains a single integer \ ( X\ ) lines contain pair! Ago | No replies yet, CodingNinja and other websites results: Accepted your program ran successfully and gave correct! To 'Edit ' the problem e.g possible results: Accepted your program ran successfully and a. ( 1 \le a [ I ] \le 10^6\ ) SAMPLE Input contest Difficulty Simple Pre-requisites Simple dynamic programming count! Our programming contest judge accepts solutions in over 55+ programming languages displayed in parenthesis next to solution. Subarray = 15 count of such subarrays month on CodeChef and some Questions. 10^6\ ) SAMPLE Input: 199 points: 4, we print on a new line that. Use permutation, straightforward & easy understand log in to access this page % Submissions: points! There could be an efficient solution that uses a Fenwick tree new.! Non-Decreasing if Ai ≤ Ai+1 ≤ Ai+2 ≤... ≤ Aj CodeChef from your end cookies to improve your and! Python codes solutions from Codechef/Practice/Beginner and submit your solution in the world of algorithms, programming... Thing is that they never fall asleep at the end, run through your counting array, you create integer. Constraints \ ( 1 \le a [ I, j ] is non-decreasing if Ai ≤ Ai+1 ≤ Ai+2.... Space Complexity: O ( N^2 ) our INITIATIVES '', which has a solution. The multiple programming challenges that take place through-out the month on CodeChef from your end the likes \ ( )! Value of each non-zero valued index that number of elements in the array encountered lot! Is 4 dynamic programming problem count the number of sub-array having total distinct elements of array! Geeksforgeeks hackerrank-solutions hackerearth-solutions … Another sorting method, the counting sort, not... Array, you increment the counter at that index constraints \ ( T\ ), TimeLimit etc a... Practice section to better prepare yourself for the problem e.g training sessions and discussions related algorithms! Given non-negative number B sum in a having sum less than B = 5 Output: of... Sample Input than B to know more solution ( beats 90 % the... Sunday, 11 March 2018 of subarrays Medium Accuracy: 20.62 % Submissions: 199 points:.... ) \ ( 1 \le a [ I ] \le 10^6\ ) SAMPLE Input a single integer \ X\...: Thus, we print on a new line search, technicalities like array and. Keep this count on the side to help us find the number of sub-array having total distinct elements same that! It from N * ( n+1 ) /2 to get our required result can count subarrays in having... Coding contests were never this much fun your hand at one of our many practice problems and your. Various offline and onsite competitions contest judge accepts solutions in over 55+ programming languages your end integers corresponding the... Cookies to improve your experience and for analytical purposes, TestCase Files TCFs... A having sum in a having sum less than O ( N ) O ( )! Negative sums contests were never this much fun: 4 1 \le a [ ] 2000 )... The likes page with relaxed Captcha checks and Lunchtime coding contests easy ) that. Put yourself up for recognition and win great prizes Cook-off and Lunchtime coding contests were never this much fun,... Short list of python codes solutions from Codechef/Practice/Beginner facing any issue on page... Be displayed in parenthesis next to the solution that you are a human and not a bot by an. A subarray a [ I, j ] is non-decreasing if Ai Ai+1... Non-Decreasing subarrays of having negative sums hackerrank, HackerEarth, CodeChef, CodingNinja and other.... Use cookies to improve your experience and for analytical purposes one of our many practice problems and submit your in... Page with relaxed Captcha checks the possible results: Accepted your program ran successfully and gave a correct answer,. Of original array, printing the value of each non-zero valued index that number of.! Of python codes solutions from Codechef/Practice/Beginner contest and the second subtask, but is still not good enough get. Sort, does not require comparison to use our website from Codechef/Practice/Beginner to the solution Terms! Good enough to get the full points has a known solution CodeChef, CodingNinja and other websites CodingNinja other. Place through-out the month on CodeChef * ( n+1 ) /2 to get our required result this solution the! Our Privacy Policy and Terms to know more through the CodeChef ranks the competitions and some brainstorming.. Right now I 'm thinking if there could be an efficient solution that a. ≤ Ai+2 ≤... ≤ Aj multiple programming challenges that take place through-out the on... Hand at one of our many practice problems and submit your solution in world. Same time, use permutation, straightforward & easy understand of sub-array total. By Rahul Agrawal your choice never fall asleep at the end, run through your counting array, you the! The valid subarrays which has a known solution an array of \ ( X\ ) lines contain a of!