根据题意,给定一个 \(2\times2\) 的仅包含 \(0\) 和 \(1\) 的二维数组.定义一个操作,每次可以选择一行和一列将其变成 \(0\),求最小操作次数. 思路:根据枚举可得共有 \(14\) 种矩阵形态,通过观察可得: 当矩阵中 \(1\) 的数量为 \(0\) 时,即只有一种形态,其最小操作次数为 \(0\). 当矩阵中 \(1\) 的数量为 \(1\) 时,共有四种形态(分别是 \(1\) 分布在四个角),此时最小操作次数为 \(1\). 当矩阵中 \(1\) 的数量为 \…

1. 机器学习更多应用举例: 人脸识别   2. 机器学习就业需求:      LinkedIn所有职业技能需求量第一:机器学习,数据挖掘和统计分析人才      http://blog.linkedin.com/2014/12/17/the-25-hottest-skills-that-got-people-hired-in-2014/   3.  深度学习(Deep Learning)   3.1 什么是深度学习?             深度学习是基于机器学习延伸出来的一个新的领域,由以人…

E. Packmen time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output A game field is a strip of 1 × n square cells. In some cells there are Packmen, in some cells - asterisks, other cells are empty.…

Working without a break makes you more prone to error. The great drawback to living near a main road is noise. China has become the largest goods producer in the world. It was a marvelous night with a tempest to rouse the gods. In his job, patience i…

Television broadcasts of events can be enhanced by providing graphics that are blended with other images or video to convey information to viewers. Such information can be related to the event, people involved in the event, or any other subject that…

How much of each year do spiders killing insects? Why, you may wonder, should spiders be our friends? Because they destroy so many insects, and insects include some of the greatest enemies of the human race. Insects would make it impossible for us to…

题面:洛谷P3119 Grass Cownoisseur G 本人最近在熟悉Tarjan的题,刷了几道蓝题后,我飘了 趾高气扬地点开这道紫题,我一瞅: 哎呦!这不是分层图吗? 突然就更飘了~~~ 用时20min写了一个分层图+bfs上去,却看到了一片红...... 我:???? 苦(查)思(看)冥(题)想(解)后,我恍然大悟 我好像忘了比较大小了(→_→) 改了改,提交上去,果然A了~~~ 下面进入正题: 大约的问题就是:已知有n个点,m条有向边,问从1点出发,最后回到1点,可以逆行一次,最多能…

题意:有一块草坪,这块草坪长l 米,宽 w 米,草坪有一些喷头,每个喷头在横坐标为 p 处,每个喷头的纵坐标都是(w/2) ,并且喷头的洒水范围是一个以喷头为圆心,半径为 r 米的圆.每次最少需要打开多少个喷头来给草坪洒水,并且草坪各处都能被洒到,不行输出-1 思路:这是一道区间覆盖(贪心)题: 有一堆区间 l1, r1:l2, r2...ln,rn,问你最少用几个能覆盖0~P的长度 那么我们先按照L升序排序,far是目前所能找到的最远处,R是上一次查询所能找到的最远处,每次查询我们都要找后面满…

题意:n*m的方格,“0 x”表示x轴在x位置切一刀,“0 y”表示y轴在y位置切一刀,每次操作后输出当前面积最大矩形. 思路:用set分别储存x轴y轴分割的点,用multiset(可重复)储存x轴y轴边,每次输出最大的长和最大的宽的积.题目可能重复切.multiset如果直接erase(13)会把所有的13都删掉,如果只想删一个则erase(multiset.find(13)).第一次知道set自带二分... 这里multiset也可以用map<int, int, greater<int&g…

题目描述 In an effort to better manage the grazing patterns of his cows, Farmer John has installed one-way cow paths all over his farm. The farm consists of N fields, conveniently numbered 1..N, with each one-way cow path connecting a pair of fields. For…