And using the set as the queue to remove the duplicates. 3)Then using that index value backspace the nearby value using substring()[which has to be separated and merged without # character]. ☆☆☆ 005. Substring with Concatenation of All Words 159. Spiral Matrix II; LeetCode 139. The encoding rule is: k[encoded_string], where theencoded_stringinside the square brackets is being repeated exactlyktimes. The space complexity of the above code is O(1) because we are using only a variable to store answer. Longest Substring with At Least K Repeating Characters 12. Assumptions. 507. Encode String with Shortest Length. Two Sum (Easy) 2. Combination Sum IV; 389. Perfect Squares. Find All Duplicates in an Array; 445. Longest Substring Without Repeating Characters (Leetcode) — Try applying the same logic. LeetCode ; Introduction Design 348. Longest Palindromic Substring 6. Find the Difference; 392. Complexity Analysis of Valid Perfect Square Leetcode Solution Time complexity. For example, S="ADOBECODEBANC" T="ABC" Minimum window is"BANC". Edit Distance. Analysis: For this problem, I'd like to show the approach using BFS, and the DP. Longest Substring Without Repeating Characters 2) If it contains then find index position of # using indexOf(). A general way is to use a hashmap assisted with two pointers. Wildcard Matching 242. Add Two Numbers (Medium) 3. Try out this on Leetcode Substring Search 3. References. Add Two Numbers 3. Find All Anagrams in a String; 442. Post a comment. Perfect Squares 200. Unique Paths II . Climbing Stairs. 279. Longest Substring with At Most Two Distinct Characters Minimum Window Substring 30. Trapping Rain Water; LeetCode 41. Brute-force 解法 2. Perfect Squares; LintCode 92. The time complexity of the above code is O(logn). Maximum Contiguous Subarray ☆☆☆ ☆☆ 070. Maximal … Given a non-empty string, encode the string such that its encoded length is the shortest.. Unique Binary Search Trees II. You may assume the given string consists of lowercase English letters only and its length will not exceed 10000. Two Sum (Easy) 2. Minimum Window Substring (Shortest Substring from Pangram) Given a string S and a string T, find the minimum window in S which will contain all the characters in T in complexity O(n). Given a non-empty string check if it can be constructed by taking a substring of it and appending multiple copies of the substring together. Add Two Numbers 3. Add Two Numbers; 3. Decode Ways. Two Sum (Easy) 2. Maximum XOR of Two Numbers in an Array; 435. Space complexity . 1)Check is string contains # using contains(). Click this link to try it on Leetcode Here, by using loops taking the element and next element sum to be compared with target. Integer to Roman 13. Note: k will be a positive integer and encoded string will not be empty or have extra space. String to Integer (atoi) 9. For saving some memory, each time we iterate all elements in the queue, to check each element with the perfect squares. Contribute to haoel/leetcode development by creating an account on GitHub. Longest Substring Without Repeating Characters 438. Reverse Integer 8. Find the longest common substring of two given strings. Best Time to Buy and Sell Stock ☆☆ ☆☆ 122. For example, given: s: "barfoothefoobarman" Example: Leetcode 76. Min Cost Climbing Stairs. If we apply this brute force, it would take O(n*n) to generate all substrings and O(n) to do a check on each one. LeetCode LeetCode Diary 1. Climbing Stairs ☆☆ ☆☆☆ 072. Median of Two Sorted Arrays 5. Word Break II. Number of Islands (Amazon) 694. Judge Route Circle 482. Longest Valid Parentheses ☆☆☆ ☆☆☆ 053. Pascal's Triangle II. S = “abcde”, T = “cdf”, the longest common substring of S and T is “cd” Solution: match[i][j]: s前i个字母和t前j个字母的longest common substring (including i and j) Pascal's Triangle. Substring Problem Template. Example: Input: 28 Output: True Explanation: 28 = … Regular Expression Matching 11. Get link; Facebook; Twitter; Pinterest; Email; Other Apps; Comments. Two Sum 2. Method 2. Longest Substring Without Repeating Characters (Medium) 4. Word Break. Longest Substring Without Repeating Characters 4. ZigZag Conversion 7. Maximal Rectangle. Palindrome Number 10. Add Two Numbers (Medium) 3. LeetCode Solution. Longest Substring Without Repeating Characters 4. First Missing Positive; LeetCode 340. Convert a Number to Hexadecimal; 415. Unique Paths. Two Sum; 2. The two given strings are not null; Examples. Minimum Path Sum. Longest Palindromic Substring 目录 问题定义 1. Container With Most Water Here n is the value of num. Perfect Number (Easy) We define the Perfect Number is a positive integer that is equal to the sum of all its positive divisors except itself.. Now, given an integer n, write a function that returns true when it is a perfect number and false when it is not.. Range Sum Query - Immutable. For more Leetcode Problems. Longest Palindromic Substring (Medium) Longest Substring Without Repeating Characters … Find All Anagrams in a String 76. This problems mostly consist of real interview questions that are asked on big companies like Facebook, Amazon, Netflix, Google etc. Given a positive integer n, find the least number of perfect square numbers (for example, 1, 4, 9, 16, ... ) which sum to n. For example, given n = 12, return 3 because 12 = 4 + 4 + 4; given n = 13, return 2 because 13 = 4 + 9. Try using bitset<128> to make the algorithm O(1) space. K-diff Pairs in an Array; LeetCode 59. If it is same then return those elements as array. This repository includes my solutions to all Leetcode algorithm questions. leetcode 946 Validate Stack Sequences Medium cn 946 Search 946. leetcode 482 License Key Formatting Easy cn 482 Search 482. leetcode 1320 Minimum Distance to Type a Word Using Two Fingers Hard cn 1320 Search 1320. leetcode 951 Flip Equivalent Binary Trees Medium cn 951 Search 951 改进的方法 Manacher 算法 LeetCode; Introduction Algorithms Depth-first Search ... Substring Problem Template Kadane's Algorithm KMP Fenwick Tree or Binary Indexed Tree Segment Tree Range Minimum Query Subset Sum Sweep-line Algorithm Expression Tree Interval Search Tree Monte Carlo Method LeetCode LeetCode Diary 1. Lowercase English letters only and its length will not exceed 10000 Stock ☆☆ ☆☆ 122 then return those as. * n ) the same logic only a variable to store answer string such that encoded! Like Facebook, Amazon, Netflix, Google etc If it is same then those. 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