Maximum XOR of Two Numbers in an Array (Medium), 423. )395.Longest Substring with At Least K Repeating Characters, 378.Kth Smallest Element in a Sorted Matrix, 331.Verify Preorder Serialization of a Binary Tree, 309.Best Time to Buy and Sell Stock with Cooldown, 158.Read N Characters Given Read4 II - Call multiple times, 297.Serialize and Deserialize Binary Tree, 211.Add and Search Word - Data structure design, 236.Lowest Common Ancestor of a Binary Tree, 235.Lowest Common Ancestor of a Binary Search Tree, 117.Populating Next Right Pointers in Each Node II, 80.Remove Duplicates from Sorted Array II, 340.Longest Substring with At Most K Distinct Characters, 298.Binary Tree Longest Consecutive Sequence, 159.Longest Substring with At Most Two Distinct Characters, 323.Number of Connected Components in an Undirected Graph, 381.Insert Delete GetRandom O(1) - Duplicates allowed, https://leetcode.com/problems/find-permutation/\#/description. The length of input string is a positive integer and will not exceed 10,000, 381 Insert Delete GetRandom O(1) - Duplicates allowed Hard-duplicates-allowed-hard.md), 3. LeetCode LeetCode Diary 1. 496. So, what we want to do is to locate one permutation … The exact solution should have the reverse. Medium #40 Combination Sum II. And our secret signature was constructed by a special integer array, which contains uniquely all the different number from 1 to n (n is the length of the secret signature plus 1). Max Sum of Rectangle No Larger Than K (Hard), 375. Reconstruct Original Digits from English (Medium), 434. 为什么这个算法是对的,原因是,一开始rest是从小到大sorted的,遇到'I'我们不做任何处理,遇到‘D’ sub str时,就reverse相应的rest,即便这个‘D’ sub str前有‘I’, 因为这个sub str ‘D’ 在‘I’ 之后,所以不管reverse与不reverse这部分的rest都比前面的大,所以这就保证了‘I’ 的正确性,reverse 的 这段rest保证了‘D’ 的正确性,如果之后有‘I’, 因为这段‘D’ 对应的rest在后面 ‘I’ 对应的rest之前,所以这段‘D’ 对应的 rest都比后面‘I’ 对应的rest 小,这也就保证了后面的‘I’ 的正确性. 490. first_page Previous. This is a typical combinatorial problem, the process of generating all valid permutations is visualized in Fig. For eg, string ABC has 6 permutations. Notes * Length of given string s will always equal to n - 1 * Your solution should run in linear time and space. First Unique Character in a String (Easy), 411. Read N Characters Given Read4 (Easy), 158. Every leave node is a permutation. 13, Oct 20. favorite_border Like. Pacific Atlantic Water Flow (Medium), 421. For example, lexicographically smaller permutation of “4321” is “4312” and next smaller permutation of “4312” is “4231”. The input string will only contain the character 'D' and 'I'. Find the largest index k such that a[k] < a[k + 1]. Contribute to yuechuanx/LeetCode development by creating an account on GitHub. Fraction to Recurring Decimal (Medium), 167. Only medium or above are included. For example, the secret signature "DI" can be constructed by array [2,1,3] or [3,1,2], but won't be constructed by array [3,2,4] or [2,1,3,4], which are both illegal constructing special string that can't represent the "DI"secret signature. It will still pass the Leetcode test cases as they do not check for ordering, but it is not a lexicographical order. Predict the Winner (Medium) 487. Longest Substring with At Most Two Distinct Characters (Hard), 166. ... 484_Find_Permutation . Find Permutation (Medium) 485. The idea is to swap each of the remaining characters in … Two Sum III - Data structure design (Easy), 173. Let's experiment with Networking. January 31, 2017 Author: david. Given a word, find lexicographically smaller permutation of it. By now, you are given a secret signature consisting of character 'D' and 'I'. Compute The Next Permutation of A Numeric Sequence - Case Analysis ("Next Permutation" on Leetcode) - Duration: 12:40. 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