随笔分类 - LeetCode
摘要：Next Greater Element III (M) 题目 Given a positive integer n, find the smallest integer which has exactly the same digits existing in the integer n and
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摘要：Balanced Binary Tree (E) 题目 Given a binary tree, determine if it is height-balanced. For this problem, a height-balanced binary tree is defined as: a
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摘要：Smallest Range II (M) 题目 Given an array A of integers, for each integer A[i] we need to choose either x = -K or x = K, and add x to A[i] (only once).
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摘要：Decoded String at Index (M) 题目 An encoded string S is given. To find and write the decoded string to a tape, the encoded string is read one character
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摘要：Cherry Pickup II (H) 题目 Given a rows x cols matrix grid representing a field of cherries. Each cell in grid represents the number of cherries that you
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摘要：4Sum II (M) 题目 Given four lists A, B, C, D of integer values, compute how many tuples (i, j, k, l) there are such that A[i] + B[j] + C[k] + D[l] is ze
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摘要：Validate Binary Search Tree (M) 题目 Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as follows: The l
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摘要：Squares of a Sorted Array (E) 题目 Given an integer array nums sorted in non-decreasing order, return an array of the squares of each number sorted in n
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摘要：Palindrome Partitioning (M) 题目 Given a string s, partition s such that every substring of the partition is a palindrome. Return all possible palindrom
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摘要：Smallest Subtree with all the Deepest Nodes (M) 题目 Given the root of a binary tree, the depth of each node is the shortest distance to the root. Retur
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摘要：Remove Duplicates from Sorted Array II (M) 题目 Given a sorted array nums, remove the duplicates in-place such that duplicates appeared at most twice an
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摘要：Valid Mountain Array (E) 题目 Given an array of integers arr, return true if and only if it is a valid mountain array. Recall that arr is a mountain arr
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摘要：Binary Search Tree Iterator (M) 题目 Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BS
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摘要：Pairs of Songs With Total Durations Divisible by 60 (M) 题目 You are given a list of songs where the ith song has a duration of time[i] seconds. Return
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摘要：Populating Next Right Pointers in Each Node II (M) 题目 Given a binary tree struct Node { int val; Node *left; Node *right; Node *next; } Populate each
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摘要：Can Place Flowers (E) 题目 You have a long flowerbed in which some of the plots are planted, and some are not. However, flowers cannot be planted in adj
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摘要：The kth Factor of n (M) 题目 Given two positive integers n and k. A factor of an integer n is defined as an integer i where n % i == 0. Consider a list
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摘要：Increasing Order Search Tree (M) 题目 Given the root of a binary search tree, rearrange the tree in in-order so that the leftmost node in the tree is no
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摘要：Linked List Random Node (M) 题目 Given a singly linked list, return a random node's value from the linked list. Each node must have the same probability
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摘要：Maximum Depth of Binary Tree (E) 题目 Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from
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