解:略一思索:网络流啊!(别问我是怎么想到的......) 发现跟志愿者招募有点像.于是把图建一下,在下面开一条通道,但是每个点又都要经过,这时我们就无脑上下界一波. 通道向点连边,有费用.每个点向它下一次出现的点连边,费用0.每个点还向通道连边,费用0. 上下界费用流跑一下就出来费用了.然后是输出方案,看哪些边有流量,直接模拟. #include <bits/stdc++.h> , INF = 0x3f3f3f3f; struct Edge { int nex, v, c, len; Edg…

题意: 让你输出长度为n的某个序列,然后给你m个变量. 每次给某个数赋值的代价是 假设赋值a=7那么代价是3,因为7的二进制位中有3个1. 要求最后总代价最小. 输出总共要进行操作的次数,和最小代价. 先吐槽下,早期的cf题很多没有官方题解,只找到两篇中文题解...第一篇完全没搞懂大神再说什么.建图的方法是在第二篇中受到启发[虽然也没搞懂大神在说什么] 首先说下这题对我的启示: 1.现在对状态这个词越发有深的理解了,很多题目只要理解了某个抽象意义上的状态,加上他们之间的转换的方式[也有很多人说是…

题面 CF802C Heidi and Library (hard) 有一个大小为 \(k\) 的空书架.有 \(n\) 天和 \(n\) 种书,每天要求书架中有书 \(a_i\).每天可以多次买书,买书 \(i\) 的价格为 \(c_i\).每天可以扔书(因为书架满了).求满足要求的最小代价. 数据范围:\(1\le n,k\le 80\). 路标 很明显这是一道套路烂大街的水题,但是今天蒟蒻想讲 \(3\) 种巧妙的做法. 此题的输出方案版:CF132E Bits of merry old…

A Child's History of England, by Charles Dickens (狄更斯) CHAPTER I ANCIENT ENGLAND AND THE ROMANS If you look at a Map of the World, you will see, in the left-hand upper corner of the Eastern Hemisphere, two Islands lying in the sea. They are England a…

CHAPTER 9 ENGLAND UNDER WILLIAM THE SECOND, CALLED RUFUS William the Red, in breathless haste, secured [get] the three great forts of Dover, Pevensey, and Hastings, and made with hot speed for Winchester, where the Royal treasure was kept. The treasu…

To strengthen his power, the King with great ceremony betrothed his eldest daughter Matilda, then a child only eight years old, to be the wife of Henry the Fifth, the Emperor of Germany. To raise her marriage-portion [dowry, 嫁妆], he taxed the English…

He had become Chancellor, when the King thought of making him Archbishop. He was clever, gay, well educated, brave; had fought in several battles in France; had defeated a French knight in single combat, and brought his horse away as a token of the v…

Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming weight). For example, the 32-bit integer ’11' has binary representation 00000000000000000000000000001011, so the function should retu…

Reverse bits of a given 32 bits unsigned integer. For example, given input 43261596 (represented in binary as 00000010100101000001111010011100), return 964176192 (represented in binary as00111001011110000010100101000000). Follow up:If this function i…

题目描述: Write a function that takes an unsigned integer and returns the number of '1' bits it has (also known as the Hamming weight). For example, the 32-bit integer '11' has binary representation 00000000000000000000000000001011, so the function shoul…