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全部文章（共118篇）

44 Binary Search Tree to Greater Sum Tree

题目 Given the root of a binary search tree with distinct values, modify it so that every node has a new value equal to the sum of the values of the or...

2020-03-09

0 529

43 Max Increase to Keep City Skyline

题目 In a 2 dimensional array grid, each value grid[i][j] represents the height of a building located there. We are allowed to increase the height of a...

2020-03-07

0 479

42 Deepest Leaves Sum

题目 Given a binary tree, return the sum of values of its deepest leaves. Constraints: The number of nodes in the tree is between 1 and 10^4. The val...

2020-03-06

0 513

41 Group the People Given the Group Size They Belong To

题目 There are n people whose IDs go from 0 to n - 1 and each person belongs exactly to one group. Given the array groupSizes of length n telling the g...

2020-03-05

0 431

40 How Many Numbers Are Smaller Than the Current Number

题目 Given the array nums, for each nums[i] find out how many numbers in the array are smaller than it. That is, for each nums[i] you have to count the...

2020-03-04

0 479

【计算机系统概论】

计算机系统概论 1. 概论 1.1 问题引入 1.2 计算机系统基本组成与基本功能 1.3 指令执行 1.4 计算机系统层次 1.5 计算机性能评价 1.6 小结 2. 数据的机器级表示和处理 2.1 引入 2.2 有符号...

2020-03-03

0 1067

39 Sum of Nodes with Even-Valued Grandparent

为啥没有38？因为38没过审。今天点了十张图，登陆上了。题目 Given a binary tree, return the sum of values of nodes with even-valued grandparent. (A grandparent of a node is t...

2020-03-03

0 450

37 Number of Steps to Reduce a Number to Zero

题目 Given a non-negative integer num, return the number of steps to reduce it to zero. If the current number is even, you have to divide it by 2, othe...

2020-02-29

0 449

36 Sort Integers by The Number of 1 Bits

题目 Given an integer array arr. You have to sort the integers in the array in ascending order by the number of 1’s in their binary representation and ...

2020-02-28

0 518

35 Delete Columns to Make Sorted

题目 We are given an array A of N lowercase letter strings, all of the same length. Now, we may choose any set of deletion indices, and for each strin...

2020-02-27

0 480