Word Break. 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. Climbing Stairs. Find the Difference; 392. Longest Substring with At Most Two Distinct Characters Word Break; LeetCode 279. Two Sum; 2. Note: If there is no such window in S that … Maximal … Median of Two Sorted Arrays 5. Longest Valid Parentheses ☆☆☆ ☆☆☆ 053. Substring with Concatenation of All Words 159. Group Anagrams 657. Valid Perfect Square; 371. Convert a Number to Hexadecimal; 415. Click this link to try it on Leetcode Here, by using loops taking the element and next element sum to be compared with target. Median of Two Sorted Arrays (Hard) 5. Roman to Integer 44. 2) If it contains then find index position of # using indexOf(). Add Two Numbers (Medium) 3. For example, given: s: "barfoothefoobarman" Climbing Stairs ☆☆ ☆☆☆ 072. Best Time to Buy and Sell Stock ☆☆ ☆☆ 122. Min Cost Climbing Stairs. Leetcode Python solutions About. Edit Distance. Longest Substring Without Repeating Characters 438. Leetcode Leetcode index 1. Perfect Squares. Unique Binary Search Trees. Get link; Facebook; Twitter; Pinterest; Email; Other Apps; Comments. Brute-force 解法 2. Try out this on Leetcode Longest Substring with At Most K Distinct Characters 395. Given a string, find the length of the longest substring T that contains at most k distinct characters. Random Pick Index; 405. A simple way is to generate all the substring and check each one whether it has exactly k unique characters or not. LeetCode 394. Integer Replacement; 398. The space complexity of the above code is O(1) because we are using only a variable to store answer. Maximum XOR of Two Numbers in an Array; 435. Is Subsequence ; 397. Add Two Numbers 3. Spiral Matrix II; LeetCode 139. Pascal's Triangle. Longest Substring Without Repeating Characters … This problems mostly consist of real interview questions that are asked on big companies like Facebook, Amazon, Netflix, Google etc. 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) Maximal Rectangle. Add Two Numbers 3. Trapping Rain Water; LeetCode 41. Longest Substring Without Repeating Characters … Analysis: For this problem, I'd like to show the approach using BFS, and the DP. Add Strings; 421. Longest Substring Without Repeating Characters 4. Decode String; LeetCode 42. LeetCode LeetCode Diary 1. Reverse Integer 8. Non-overlapping Intervals; 438. Maximum Contiguous Subarray ☆☆☆ ☆☆ 070. Unique Binary Search Trees II. Longest Substring with At Most Two Distinct Characters 340. Method 2. Perfect Squares 200. Two Sum (Easy) 2. Substring Search 3. LeetCode ; Introduction Design 348. Perfect Squares; LintCode 92. Space complexity . And using the set as the queue to remove the duplicates. Leetcode Leetcode index 1. Find All Duplicates in an Array; 445. LeetCode Solution. Substring Problem Template. 471. Range Sum Query - Immutable. Example: Leetcode 76. Try using bitset<128> to make the algorithm O(1) space. Here, we are doing same steps simultaneously for both the strings. Longest Palindromic Substring 目录 问题定义 1. References. Palindrome Number 10. Substring with Concatenation of All Words 30(LeetCode) Question. Container With Most Water Two Sum 2. 1)Check is string contains # using contains(). The time complexity of the above code is O(logn). Add Two Numbers (Medium) 3. Sum of Two Integers; 377. Word Break II. The encoding rule is:k[encoded_string], where theencoded_stringinside the square brackets is being repeated exactlyktimes. Judge Route Circle 482. Two Sum (Easy) 2. Contains Company Wise Questions sorted based on Frequency and all time - krishnadey30/LeetCode-Questions-CompanyWise Minimum Window Substring; LeetCode 532. You are given a string, s, and a list of words, words, that are all of the same length. 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). Complexity Analysis of Valid Perfect Square Leetcode Solution Time complexity. Minimum Window Substring 30. Here comes the template. Median of Two Sorted Arrays 5. Note: k will be a positive integer and encoded string will not be empty or have extra space. Given anon-emptystring, encode the string such that its encoded length is the shortest.. The template is … LeetCode Problems' Solutions . Two Sum 2. Longest Substring Without Repeating Characters 4. A general way is to use a hashmap assisted with two pointers. Minimum Path Sum. BFS can help us find the shortest path. The problem can be solved in O(n*n). Pascal's Triangle II. The encoding rule is: k[encoded_string], where theencoded_stringinside the square brackets is being repeated exactlyktimes. Encode String with Shortest Length. For saving some memory, each time we iterate all elements in the queue, to check each element with the perfect squares. 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. Find All Anagrams in a String 76. If it is same then return those elements as array. Edit Distance ☆☆☆ ☆☆ 121. Starting from number n, each time we just try to subtract one perfect square from it. Longest Substring with At Least K Repeating Characters 12. Burst Balloons. Longest Palindromic Substring 5. 改进的方法 Manacher 算法 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 3)Then using that index value backspace the nearby value using substring()[which has to be separated and merged without # character]. Longest Substring Without Repeating Characters (Medium) 4. Unique Paths. Example: Input: 28 Output: True Explanation: 28 = … leetcode Question: Perfect Squares Perfect Squares. Wildcard Matching 242. Longest Palindromic Substring ☆☆☆ ☆☆☆ 032. Minimum Window Substring. Combination Sum IV; 389. Stone Game. Leetcode 689: Maximum sum of 3 non-overlapping subarrays (2) Leetcode 69 (1) Leetcode 69. Assumptions. Note: Number of Islands (Amazon) 694. Thus overall it would go O(n*n*n). Longest Palindromic Substring (Medium) You may assume the given string consists of lowercase English letters only and its length will not exceed 10000. Find all starting indices of substring(s) in s that is a concatenation of each word in words exactly once and without any intervening characters. 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.. Add Two Numbers; 3. Valid Anagram 49. 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. Triangle. Longest Substring Without Repeating Characters (Leetcode) — Try applying the same logic. LeetCode : Longest Palindromic Substring Question Given an unsorted array of integers, find the length of longest increasing subsequence. Add Two Numbers (Medium) 3. Two Sum (Easy) 2. 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. ZigZag Conversion 7. For more Leetcode Problems. Longest Palindromic Substring 6. Longest Palindromic Substring. Integer to Roman 13. Here n is the value of num. License Key Formatting 681. Contribute to haoel/leetcode development by creating an account on GitHub. Find All Anagrams in a String; 442. 279. Longest Substring with At Most K Dis... LeetCode 76. This repository includes my solutions to all Leetcode algorithm questions. Unique Paths II . Decode Ways. Find the longest common substring of two given strings. Regular Expression Matching 11. For example, S="ADOBECODEBANC" T="ABC" Minimum window is"BANC". String to Integer (atoi) 9. First Missing Positive; LeetCode 340. ☆☆☆ 005. K-diff Pairs in an Array; LeetCode 59. 507. The two given strings are not null; Examples. 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