Given an integer array nums, find the sum of the elements between indices i and j (i ≤ ...
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303. Range Sum Query - Immutable (E)
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302. Smallest Rectangle Enclosing Black Pixels (H)
An image is represented by a binary matrix with 0 as a white pixel and 1 as a black pix...
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255. Verify Preorder Sequence in Binary Search Tree (M)
Given an array of numbers, verify whether it is the correct preorder traversal sequence...
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254. Factor Combinations (M)Numbers can be regarded as product of its factors. For example, 8 = 2 x 2 x 2;= 2 x 4.W...
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253. Meeting Rooms II (M)
Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2...
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252. Meeting Rooms (E)
Given an array of meeting time intervals where intervals[i] = [starti, endi], determine...
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251. Flatten 2D Vector (M)
Design and implement an iterator to flatten a 2d vector. It should support the followin...
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250. Count Univalue Subtrees (M)Given the root of a binary tree, return the number of uni-value subtrees. A uni-value s...
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249. Group Shifted Strings (M)
Given a string, we can "shift" each of its letter to its successive letter, for example...
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248. Strobogrammatic Number III (H)
A strobogrammatic number is a number that looks the same when rotated 180 degrees (look...
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247. Strobogrammatic Number II (M)
A strobogrammatic number is a number that looks the same when rotated 180 degrees (look...
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246. Strobogrammatic Number (E)
A strobogrammatic number is a number that looks the same when rotated 180 degrees (look...
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245. Shortest Word Distance III (M)
Given a list of words and two words word1 and word2, return the shortest distance betwe...
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244. Shortest Word Distance II (M)Design a class which receives a list of words in the constructor, and implements a meth...
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243. Shortest Word Distance (E)
Given a list of words and two words word1 and word2, return the shortest distance betwe...
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242. Valid Anagram (E)
Given two strings s and t , write a function to determine if t is an anagram of s. Exam...
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241. Different Ways to Add Parentheses (M)
Given a string of numbers and operators, return all possible results from computing all...
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240. Search a 2D Matrix II (M)Write an efficient algorithm that searches for a target value in an m x n integer matri...
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239. Sliding Window Maximum (H)You are given an array of integers nums, there is a sliding window of size k which is m...
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238. Product of Array Except Self (M)
Given an array nums of n integers where n > 1, return an array output such that output...