Minimize Hamming Distance After Swap Operations, 1723. Number of Ways to Build House of Cards, 2190. Maximum Trailing Zeros in a Cornered Path, 2246. Compare Strings by Frequency of the Smallest Character, 1171. A note: I'm not sure if it exactly matches the algorithm in the code you gave, it may or may not be a different approach. Minimum Weighted Subgraph With the Required Paths, 2204. Number of Times a Driver Was a Passenger, 2240. Find Greatest Common Divisor of Array, 1981. Find Two Non-overlapping Sub-arrays Each With Target Sum, 1481. English abbreviation : they're or they're not. Minimum Number of Operations to Make String Sorted, 1835. Example 1:\n\nInput: nums = [1,2,3,1]\nOutput: 2\nExplanation: 3 is a peak element and your function should return the index number 2.\n\nExample 2:\n\nInput: nums = [1,2,1,3,5,6,4]\nOutput: 1 or 5\nExplanation: Your function can return either index number 1 where the peak element is 2,\n or index number 5 where the peak element is 6.\n Remove Letter To Equalize Frequency, 2426. The array may contain multiple. Remove Duplicates From an Unsorted Linked List, 1838. Minimum Recolors to Get K Consecutive Black Blocks, 2380. mid = start + (end - start) / 2, will give us a 'smaller' mid. Minimum Space Wasted From Packaging, 1893. Find Score of an Array After Marking All Elements, 2598. Find the Width of Columns of a Grid, 2640. Find the Score of All Prefixes of an Array, 2642. Which lattice parameter should be used, the one obtained by vc-relax or the optimized value acquired through the Birch-Murnaghen equation? Pour Water Between Buckets to Make Water Levels Equal, 2138. Lexicographically Smallest String After Applying Operations, 1628. Minimum Cost to Separate Sentence Into Rows, 2056. Leftmost Column with at Least a One, 1430. Groups of Special-Equivalent Strings, 915. Given an input array , where nums [i] nums [i+1], find a peak element and return its index. Number of Subarrays with Bounded Maximum, 798. Check If All 1's Are at Least Length K Places Away, 1438. Verify Preorder Sequence in Binary Search Tree, 297. Peak Index in a Mountain Array - LeetCode 852. Find a Value of a Mysterious Function Closest to Target, 1523. Lexicographically Smallest String After Substring Operation, 2743. Paths in Matrix Whose Sum Is Divisible by K, 2436. Find Original Array From Doubled Array, 2009. Find the Student that Will Replace the Chalk, 1896. Maximum Number of Non-Overlapping Substrings, 1521. Minimum Number of Removals to Make Mountain Array, 1673. Longest Arithmetic Subsequence of Given Difference, 1227. I was doing this course on algorithms from MIT. Longest Substring with At Most K Distinct Characters, 363. I've added a note about alternating directions, this should clarify the situation. Can a creature that "loses indestructible until end of turn" gain indestructible later that turn? Find Customers With Positive Revenue this Year, 1823. If the middle element is not the peak, we check if the element on the right side is greater than the middle element. Decrypt String from Alphabet to Integer Mapping, 1312. If yes, there is always a peak element on the right side. Count Pairs of Equal Substrings With Minimum Difference, 1798. Orders With Maximum Quantity Above Average, 1868. Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. Find the Kth Smallest Sum of a Matrix With Sorted Rows, 1441. Maximum Number of Vowels in a Substring of Given Length, 1457. I am solving leetcode questions, and I came across this question: Let's call an array A a mountain if the following properties hold: There exists some 0 < i < A.length - 1 such that A[0] < A[1] < A[i-1] < A[i] > A[i+1] > > A[A.length - 1], Given an array that is definitely a mountain, return any i such that A[0] < A[1] < A[i-1] < A[i] > A[i+1] > > A[A.length - 1]**. Given an input array wherenum[i] num[i+1], find a peak element and return its index. Asking for help, clarification, or responding to other answers. Design Graph With Shortest Path Calculator, 2644. Maximum Running Time of N Computers, 2142. This happens for logn times. First, we will focus on using Binary Search. Minimum Moves to Move a Box to Their Target Location, 1265. Check if There Is a Valid Parentheses String Path, 2271. How to write an arbitrary Math symbol larger like summation? For square array the reccurence relation will be, This answer is wrong since you are not considering the number of columns and number of rows right. Most Visited Sector in a Circular Track, 1561. If the array contains multiple peaks, return the index toany of the peaks. Longest Substring of One Repeating Character, 2216. Choose Numbers From Two Arrays in Range, 2144. r/leetcode on Reddit: Can you guys rate my code for peak finding Yeah it may be useless, but it is a really good algorithmic question. Find a Corresponding Node of a Binary Tree in a Clone of That Tree, 1381. Let's see the code, 162. Maximum Fruits Harvested After at Most K Steps, 2107. Airline refuses to issue proper receipt. Partition Array Into Two Arrays to Minimize Sum Difference, 2037. Minimum Degree of a Connected Trio in a Graph, 1764. Maximum Total Beauty of the Gardens, 2237. Extract Kth Character From The Rope Tree, 2696. Minimize Result by Adding Parentheses to Expression, 2234. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit, 1439. Reverse Subarray To Maximize Array Value, 1333. Longest Common Subsequence Between Sorted Arrays, 1941. Majority Element 170. That will further clarify that the running time is O(n). Number of Longest Increasing Subsequence, 674. Minimum Score After Removals on a Tree, 2323. Minimum Moves to Reach Target with Rotations, 1213. Count Collisions of Monkeys on a Polygon, 2554. 162. Longest Subsequence With Limited Sum, 2391. Minimum Number of Operations to Move All Balls to Each Box, 1770. Maximum Candies Allocated to K Children, 2228. Managers with at Least 5 Direct Reports, 571. Check Whether Two Strings are Almost Equivalent, 2071. Actors and Directors Who Cooperated At Least Three Times, 1058. Minimum Number of Days to Eat N Oranges, 1557. Maximum Product of the Length of Two Palindromic Subsequences, 2003. How Many Numbers Are Smaller Than the Current Number, 1368. Minimum Number of Increments on Subarrays to Form a Target Array, 1533. Construct Binary Tree from Preorder and Inorder Traversal, 106. You may imagine that num [-1] = num [n] = -. Count Common Words With One Occurrence, 2086. Maximum Score from Performing Multiplication Operations, 1771. Find the Prefix Common Array of Two Arrays, 2660. Minimum Number of Operations to Make All Array Elements Equal to 1, 2656. To see visually why this algorithm works, it is like grabbing the greatest value side, keep reducing the boundaries and eventually get the BestSeen value. Maximum Product of Two Elements in an Array, 1465. There is an NxN matrix. Replace the Substring for Balanced String, 1237. Minimum Operations to Make the Array Alternating, 2171. Try to solve in O(n) time. Partition String Into Substrings With Values at Most K, 2524. The Most Frequently Ordered Products for Each Customer, 1597. Final Prices With a Special Discount in a Shop, 1477. Introduction to Competitive Programming - Purdue University Sum of Digits of String After Convert, 1946. For the rest of the elements, we verify the neighbors. Minimum Swaps To Make Sequences Increasing, 828. Making statements based on opinion; back them up with references or personal experience. Count the Digits That Divide a Number, 2521. Customers With Strictly Increasing Purchases, 2475. Number of Good Ways to Split a String, 1526. Find Minimum Time to Finish All Jobs, 1724. Split a String Into the Max Number of Unique Substrings, 1594. Determine Whether Matrix Can Be Obtained By Rotation, 1887. Lowest Common Ancestor of a Binary Tree, 255. Determine Color of a Chessboard Square, 1815. Divide Players Into Teams of Equal Skill, 2492. Number of Burgers with No Waste of Ingredients, 1277. You may imagine that num[-1] = num[n] = -. A simple solution for this problem is to use linear search. Read N Characters Given read4 II - Call Multiple Times, 159. Check if Numbers Are Ascending in a Sentence, 2044. Subtree Removal Game with Fibonacci Tree, 2006. Number of Unique Subjects Taught by Each Teacher, 2357. You must write an algorithm that runs inO(log n)time. Minimum Non-Zero Product of the Array Elements, 1972. Largest Positive Integer That Exists With Its Negative, 2442. Construct Target Array With Multiple Sums, 1356. Flip Binary Tree To Match Preorder Traversal, 982. think about start = 0, end = 1, the mid = 0. Second Minimum Node In a Binary Tree, 673. Partition Array Such That Maximum Difference Is K, 2300. Last Substring in Lexicographical Order, 1168. a [i] [j] to be a local maximum, a [i+1] [j] <= a [i] [j] && a [i-1] [j] <= a [i] [j] && a [i] [j+1] <= a [i] [j] && a [i+1] [j-1] <= a [i] [j] Now given an NxN 2D array, find a peak in the array. Maximum Sum With Exactly K Elements, 2657. All People Report to the Given Manager, 1276. Count Strictly Increasing Subarrays, 2398. Minimum Deletions to Make Array Beautiful, 2218. All Ancestors of a Node in a Directed Acyclic Graph, 2193. Count Houses in a Circular Street II, 2760. Change Minimum Characters to Satisfy One of Three Conditions, 1738. Longest Substring Without Repeating Characters, 17. Get Biggest Three Rhombus Sums in a Grid, 1880. Maximum Profit of Operating a Centennial Wheel, 1601. So it's not. Maximum Distance Between a Pair of Values, 1857. Minimum Number of K Consecutive Bit Flips, 1003. Maximum Difference by Remapping a Digit, 2567. 162. Find Servers That Handled Most Number of Requests, 1608. Lowest Common Ancestor of a Binary Tree III, 1653. while start < end, which guarantees that if we are inside of the while loop, there are at least two elements. Sort Even and Odd Indices Independently, 2165. Maximum Product of the Length of Two Palindromic Substrings, 1961. First Day Where You Have Been in All the Rooms, 1999. 162. Find Peak Element - GitHub: Let's build from here Check If Word Is Valid After Substitutions, 1005. Find Maximum Number of String Pairs, 2749. Minimum Cost to Reach City With Discounts, 2095. )467.Unique Substrings in Wraparound String, 462.Minimum Moves to Equal Array Elements II, 453.Minimum Moves to Equal Array Elements, 452.Minimum Number of Arrows to Burst Balloons, 448.Find All Numbers Disappeared in an Array, 424.Longest Repeating Character Replacement, 423.Reconstruct Original Digits from English, S(? Removing Minimum and Maximum From Array, 2093. Binary Tree Longest Consecutive Sequence, 302. Sort the Students by Their Kth Score, 2546. Find the Minimum Number of Fibonacci Numbers Whose Sum Is K, 1415. Partition Array into Disjoint Intervals, 921. Count Subtrees With Max Distance Between Cities, 1618. Longest Even Odd Subarray With Threshold, 2763. Add Edges to Make Degrees of All Nodes Even, 2510. Minimum Interval to Include Each Query, 1855. Maximum Number of Words Found in Sentences, 2115. Making statements based on opinion; back them up with references or personal experience. Greatest English Letter in Upper and Lower Case, 2311. Merge Two 2D Arrays by Summing Values, 2571. Minimum Time For K Virus Variants to Spread, 1957. Maximize Sum Of Array After K Negations, 1007. Simple code to find Local Peak Element - LeetCode Maximum Number of Accepted Invitations, 1821. The Earliest and Latest Rounds Where Players Compete, 1904. 162.Find Peak Element Leetcode Minimum Operations to Halve Array Sum, 2209. Populating Next Right Pointers in Each Node, 117. Find a Peak Element II - LeetCode Number of Ways to Buy Pens and Pencils, 2244. Minimum Score by Changing Two Elements, 2570. The Score of Students Solving Math Expression, 2020. Leetcode 1901 Find a Peak Element II - YouTube Number of Restricted Paths From First to Last Node, 1787. You may imagine thatnum[-1] = num[n] = -. we will make variable low = 0 and high = length of nums -1. User Activity for the Past 30 Days I, 1142. If a crystal has alternating layers of different atoms, will it display different properties depending on which layer is exposed? Kth Smallest Product of Two Sorted Arrays, 2041. Count Artist Occurrences On Spotify Ranking List, 2672. The Number of Seniors and Juniors to Join the Company II, 2011. Convert an Array Into a 2D Array With Conditions, 2616. So I have copied the main part of the code below for those who know python and can tell what algorithm is being used from the code. Reconstruct Original Digits from English, 424. Smallest Missing Non-negative Integer After Operations, 2602. Let's assume that width of the array is bigger than height, otherwise we will split in another direction. Find the Maximum Divisibility Score, 2645. Pairs of Songs With Total Durations Divisible by 60, 1011. Two Sum III - Data structure design 171. Else if this time did 1a), choose the half of BestSeen, go back to step 1b), Else, choose the half of BestSeen, go back to step 1a). [theta n], 3) Find the values of its neighbour. If it's not, we can step from that maximum to increasing elements and will definitely not cross the central row, so a peak will definitely exist in the corresponding half. Minimum Operations to Convert Number, 2060. Count Number of Special Subsequences, 1956. Clone Binary Tree With Random Pointer, 1489. Equal Sum Arrays With Minimum Number of Operations, 1779. Customer Placing the Largest Number of Orders, 597. Ways to Express an Integer as Sum of Powers, 2789. Check If String Is a Prefix of Array, 1962. Remove Colored Pieces if Both Neighbors are the Same Color, 2039. Remove Digit From Number to Maximize Result, 2260. Friendly Movies Streamed Last Month, 1497. Customers with Maximum Number of Transactions on Consecutive Days, 2753. Is it appropriate to try to contact the referee of a paper after it has been accepted and published? Make Array Non-decreasing or Non-increasing, 2264. Will the fact that you traveled to Pakistan be a problem if you go to India? Remove All Ones With Row and Column Flips, 2131. Convert Binary Search Tree to Sorted Doubly Linked List, 428. Thanks for contributing an answer to Stack Overflow! Smallest Rectangle Enclosing Black Pixels, 309. Find centralized, trusted content and collaborate around the technologies you use most. Peak index in mountain question - Leetcode, What its like to be on the Python Steering Council (Ep. Count Hills and Valleys in an Array, 2212. Number of Connected Components in an Undirected Graph, 331. Find Peak Element LeetCode Solution says that - A peak element is an element that is strictly greater than its neighbors. Time complexity for this approach is O (n). The Most Recent Orders for Each Product, 1551. Shortest Subarray with Sum at Least K, 865. Find Peak Element - LeetCode View Ha_Nguyen's solution of Find Peak Element on LeetCode, the world's largest programming community. 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