LeetCode 78. Subsets
题目Given a set of distinct integers, nums, return all possible subsets (the power set).
Note: The solution set must not contain duplicate subsets.
Exam
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LeetCode 430. Flatten a Multilevel Doubly Linked List
题目You are given a doubly linked list which in addition to the next and previous pointers, it could have a child pointer, which may or may not point to
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LeetCode 662. Maximum Width of Binary Tree
题目Given a binary tree, write a function to get the maximum width of the given tree. The width of a tree is the maximum width among all levels. The bin
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LeetCode 15. 3Sum
题目Given an array nums of n integers, are there elements a, b, c in nums such that a + b + c = 0? Find all unique triplets in the array which gives the
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LeetCode 463. Island Perimeter
题目You are given a map in form of a two-dimensional integer grid where 1 represents land and 0 represents water.
Grid cells are connected horizontally/
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LeetCode 66. Plus One
题目Given a non-empty array of digits representing a non-negative integer, plus one to the integer.
The digits are stored such that the most significant
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LeetCode 461. Hamming Distance
题目The Hamming distance between two integers is the number of positions at which the corresponding bits are different.
Given two integers x and y, calc
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LeetCode 264. Ugly Number II
题目Write a program to find the n-th ugly number.
Ugly numbers are positive numbers whose prime factors only include 2, 3, 5.
Example:
123Input: n = 10
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LeetCode 957. Prison Cells After N Days
题目There are 8 prison cells in a row, and each cell is either occupied or vacant.
Each day, whether the cell is occupied or vacant changes according to
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LeetCode 107. Binary Tree Level Order Traversal II
题目Given a binary tree, return the bottom-up level order traversal of its nodes’ values. (ie, from left to right, level by level from leaf to root).
Fo
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