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303. Range Sum Query - Immutable (E)
Given an integer array nums, find the sum of the elements between indice...
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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...
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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 tra...
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254. Factor Combinations (M)Numbers can be regarded as product of its factors. For example, 8 = 2 x ...
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253. Meeting Rooms II (M)
Given an array of meeting time intervals consisting of start and end tim...
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252. Meeting Rooms (E)
Given an array of meeting time intervals where intervals[i] = [starti, e...
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251. Flatten 2D Vector (M)
Design and implement an iterator to flatten a 2d vector. It should suppo...
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250. Count Univalue Subtrees (M)Given the root of a binary tree, return the number of uni-value subtrees...
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249. Group Shifted Strings (M)
Given a string, we can "shift" each of its letter to its successive lett...