c021f3ac3397

题目 Given a collection of intervals, find the minimum number of intervals you need to re...

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题目 Assume you are an awesome parent and want to give your children some cookies. But, y...

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题目 Given an unsorted array of integers, find the length of longest increasing subsequen...

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题目 You are a professional robber planning to rob houses along a street. Each house has ...

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题目 You are climbing a stair case. It takes n steps to reach to the top. Each time you c...

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题目 Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An...

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题目 The n-queens puzzle is the problem of placing n queens on an n×n chessboard such tha...

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题目 Given a 2D board and a word, find if the word exists in the grid. The word can be co...

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题目 Given two integers n and k, return all possible combinations of k numbers out of 1 ....

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题目 Given a collection of distinct integers, return all possible permutations. Example: ...

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Given a string containing digits from 2-9 inclusive, return all possible letter combina...

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题目 Given a binary search tree (BST), find the lowest common ancestor (LCA) of two given...

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题目 You are given a binary tree in which each node contains an integer value. Find the n...

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题目 Given a binary tree, return all root-to-leaf paths. Note: A leaf is a node with no c...

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题目 Given a binary tree and a sum, determine if the tree has a root-to-leaf path such th...

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题目 Invert a binary tree. Example: Input: Output:* 解法思路（一） 反转一棵二叉树，就是将每个节点的左右孩子交换，很递归； ...

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题目 Given a binary tree, find its maximum depth. The maximum depth is the number of node...

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题目 Given a non-empty array of integers, return the k most frequent elements. Example 1:...

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题目 Given a binary tree, return the postorder traversal of its nodes' values. Example: I...