Given a binary tree containing digits from 0-9 only, each root-to-leaf path could represent a number. An example is the root-to-leaf path 1->2->3 which represents the number 123. Find the total sum of all root-to-leaf numbers. For example, 1 / \ 2 3…
Given an array of 2n integers, your task is to group these integers into n pairs of integer, say (a1, b1), (a2, b2), ..., (an, bn) which makes sum of min(ai, bi) for all i from 1 to n as large as possible. Example 1: Input: [1,4,3,2] Output: 4 Explan…
二维数组中的查找 描述 在一个二维数组中(每个一维数组的长度相同),每一行都按照从左到右递增的顺序排序,每一列都按照从上到下递增的顺序排序.请完成一个函数,输入这样的一个二维数组和一个整数,判断数组中是否含有该整数. 源码 public class Solution { public boolean Find(int target, int [][] array) { if(array.length==0 || array[0].length==0){ return false; } int r…
A. Roma and Lucky Numbers 暴力计算. B. Roma and Changing Signs 每次取最小值改变正负,优先队列维护. C. Maxim and Discounts 贪心,当买的个数等于最小\(q_i\)时,能拿就拿. D. Maxim and Restaurant 枚举最后一个不能上桌的人\(x\),\(f(i,j)\)表示i个人凑成长为\(j\)的方案数,当\(j+a[x] \gt p\)时,前\(i\)个人可以随意排列,而没上桌的人除了\(x\)外也随意…
A. Bicycle Chain 统计\(\frac{b_j}{a_i}\)最大值以及个数. B. Olympic Medal \(\frac{m_{out}=\pi (r_1^2-r_2^2)hp_1}{m_{in}=\pi r_2^2hp_2} = \frac{A}{B}\) \[r_2^2=\frac{r_1^2}{1+\frac{Ap_2}{Bp_1}}\] \(r_1,p_1\)取最大值,\(p_2\)取最小值. C. Crosses 分两种情况讨论: 两个矩形形成嵌套,那么假设\(c…
Kernel Building https://www.raspberrypi.org/documentation/linux/kernel/building.md There are two main methods for building the kernel. You can build locally on a Raspberry Pi which will take a long time; or you can cross-compile, which is much quicke…
Lab 7 Advanced Filesystem Mangement Goal: Develop skills and knowlege related to Software RAID, LVM, quota and backup. Estimated Duration: 120 minutes Sequence 1: Implementing Quotas Deliverable: A user diskhog that cannot use more than 1024k of spac…
