Content 给定一个长度为 \(n\) 的数列,试将其分成 \(k\) 段,使得每一段中的最大值的和最大. 数据范围:\(1\leqslant k,n,a_i\leqslant 2000\). Solution 我们不难发现,最优的方案其实就是将前 \(k\) 大的数各自单独放在一段里面,所以我们排序得到前 \(k\) 大的数,再找到他们的位置.那么如何记录每一段里面的其他数呢?我的方案是,将前 \(k-1\) 大的数作为每一段的最后一个数存储,剩下的那个数所在的段就是没有被前面的 \(k-…

Polycarp is practicing his problem solving skill. He has a list of n problems with difficulties a1,a2,-,an, respectively. His plan is to practice for exactly k days. Each day he has to solve at least one problem from his list. Polycarp solves the pro…

Content 给定一个长度为 \(n-1\) 的序列 \(q\),问你是否能找到一个 \(1\sim n\) 的排列 \(p\),使得 \(\forall i\in[1,n)\),\(q_i=p_{i+1}-p_i\). 数据范围:\(2\leqslant n\leqslant 2\times 10^5\),\(-n<q_i<n\). Solution 首先我们不难知道,设 \(S_i=\sum\limits_{j=1}^i q_j\),那我们不难知道,\(S_i\) 越小,第 \(i+1\…

[比赛链接] https://codeforces.com/contest/1006 [题解] Problem A. Adjacent Replacements        [算法] 将序列中的所有偶数替换为奇数即可 时间复杂度 : O(N) [代码] #include<bits/stdc++.h> using namespace std; template <typename T> inline void chkmax(T &x,T y) { x = max(x,y);…

B. Polycarp's Practice time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Polycarp is practicing his problem solving skill. He has a list of nn problems with difficulties a1,a2,-,ana1,a2,-,an…

A Mathematical Curiosity Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Problem Description Given two integers n and m, count the number of pairs of integers (a,b) such that 0 < a < b < n and (a^2+b^2 +m)/(ab)…

                                                                           . A. Adjacent Replacements 执行1e9次命令,输出的最后数组的样子 一个奇数执行两次命令 会变回原来的数字 一个偶数只会执行一次命令 变成比自身小1的数 #include<bits/stdc++.h> #define int long long #define MAX(a,b,c) max(a,max(b,c)) #de…

传送门 A. Reposts time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output One day Polycarp published a funny picture in a social network making a poll about the color of his handle. Many of his friend…

比赛时间只有两个小时,我没有选做这题,因为当时看样例也看不懂,比较烦恼. 后来发现,该题对输入输出要求很低.远远没有昨天我在做的A题的麻烦,赛后认真看了一下就明白了,写了一下,一次就AC了,没问题,真心有点后悔. 来先看题目: C. Practice time limit per test 1 second memory limit per test 256 megabytes input input.txt output output.txt Little time is left befor…

题目链接:http://codeforces.com/contest/1277/problem/A 题目大意: 求区间 \([1,n]\) 范围内有多少只包含一个数字的数. 比如:\(1,77,777,44,999999\) 都是只包含一个数字的数,而 \(12,11110,6969,987654321\) 这些不是. 解题思路: 本题可以采用枚举和数位DP解法来解决(当然,数位DP相对来说有些杀鸡用牛刀的感觉). 枚举解法 首先,我们要确定,去除 \(0\) 以外,一个 \(i\) 位数最多有…

给定一个字符串,每天可以记忆三个字符,求书写出整个字符串的天数. 每次确定要记忆的三个字母,并向后寻找,若有非三个字母其中一个,则重新开启一天记忆三个字母. #include<cstdio> #include<iostream> using namespace std; int t; string s; int main(){ scanf("%d",&t); while(t--){ cin>>s; char a='0',b='0',c='0'…

题目链接: 题目 F. Polycarp and Hay time limit per test: 4 seconds memory limit per test: 512 megabytes input: standard input output: standard output 问题描述 The farmer Polycarp has a warehouse with hay, which can be represented as an n × m rectangular table,…

Description Polycarp loves lowercase letters and dislikes uppercase ones. Once he got a string s consisting only of lowercase and uppercase Latin letters. Let A be a set of positions in the string. Let's call it pretty if following conditions are met…

版权声明: 本文为博主Bravo Yeung(知乎UserName同名)的原创文章,欲转载请先私信获博主允许,转载时请附上网址 http://blog.csdn.net/lzuacm. C#版 - 226. Invert Binary Tree - 题解 在线提交: https://leetcode.com/problems/invert-binary-tree/ 或 http://www.nowcoder.com/practice/564f4c26aa584921bc75623e48ca301…

写在前面 整个项目都托管在了 Github 上:https://github.com/ikesnowy/Algorithms-4th-Edition-in-Csharp 查找更为方便的版本见:https://alg4.ikesnowy.com/ 这一节内容可能会用到的库文件有 Quick,同样在 Github 上可以找到. 善用 Ctrl + F 查找题目. 习题&题解 2.3.1 解答 2.3.2 解答 2.3.3 解答 N / 2 在快速排序中,一个元素要被交换,有以下两种情况 1.该元素是…

F. Polycarp and Hay 题目连接: http://www.codeforces.com/contest/659/problem/F Description The farmer Polycarp has a warehouse with hay, which can be represented as an n × m rectangular table, where n is the number of rows, and m is the number of columns…

前言   [LeetCode 题解]系列传送门:  http://www.cnblogs.com/double-win/category/573499.html   1.题目描述 Find the contiguous subarray within an array (containing at least one number) which has the largest sum. For example, given the array [−2,1,−3,4,−1,2,1,−5,4], t…

Codeforces Round #547 (Div. 3) 题目链接:https://codeforces.com/contest/1141 A,B咕咕了... C. Polycarp Restores Permutation 题意: 有一个n的排列,但现在只给出相邻两位的差,问原排列是多少,如果不存在就输出-1. 题解: 通过相邻两位的差我们可以知道第一个元素和其它位置元素的大小关系,然后根据这个来搞一波就行了. 代码如下: #include <bits/stdc++.h> using n…

Educational Codeforces Round 58 (Rated for Div. 2)  题目总链接:https://codeforces.com/contest/1101 A. Minimum Integer 题意: 多组数据,给你三个数l,r,d,要求在区间[l,r]之外找一个最小的x,使得x%d==0. 题解: 当d<l or d>r的时候,直接输出d就好了. 当l<=d<=r的时候,找到最小的t,使得t*d>r就行了. 具体操作见代码: #include…

Batting Practice LightOJ - 1408(概率dp) 题意:有无限个球,进球的概率为p,问你连续不进k1个球或者连续进k2个球需要使用的球的个数的期望 思路: \(定义f[i]表示已经连续不进i个球,还需要连续不进k1-i个球的期望\) \(g[i]表示已经连续进了i个,还需要连续进k2-i个球的期望\) 显然\(f[k1] = g[k2] = 0\) \(任意0<=i<k1有f[i] = (1-p) \cdot f[i+1] + p \cdot g[1] + 1\) \…

Polycarp has nn coins, the value of the ii-th coin is aiai. Polycarp wants to distribute all the coins between his pockets, but he cannot put two coins with the same value into the same pocket. For example, if Polycarp has got six coins represented a…

[题解]CF559C C. Gerald and Giant Chess(容斥+格路问题) 55336399 Practice: Winlere 559C - 22 GNU C++11 Accepted 186 ms 1608 KB 2019-06-09 17:03:21 2019-06-09 17:03:21 一道小水题(为什么2400??我为什么之前被一道2200锤QAQ) 有个很显然的公式,在组合数学那本书上面也有. 从坐标\((0,0)\)到坐标\((x,y)\)总共有\({x+y}\c…

time limit per test2 seconds memory limit per test256 megabytes inputstandard input outputstandard output Polycarp is a music editor at the radio station. He received a playlist for tomorrow, that can be represented as a sequence a1, a2, -, an, where…

time limit per test4 seconds memory limit per test512 megabytes inputstandard input outputstandard output The farmer Polycarp has a warehouse with hay, which can be represented as an n × m rectangular table, where n is the number of rows, and m is th…

A.Regular bracket sequence A string is called bracket sequence if it does not contain any characters other than "(" and ")". A bracket sequence is called regular if it it is possible to obtain correct arithmetic expression by inserting…

题目链接:https://codeforc.es/contest/1076 A. Minimizing the String 题意:给出一个字符串,最多删掉一个字母,输出操作后字典序最小的字符串. 题解:若存在一个位置 i 满足 a[i] > a[i+1],若不删除 a[i] 则后续操作不可能更优. #include <bits/stdc++.h> using namespace std; #define ll long long #define ull unsigned long lo…

Practice Round Problem A GBus count (9pt/15pt) (2019年1月14日,kickstart群每日一题) 题意:有一条笔直的大路,上面有城市编号从 1 开始从左到右一次排列.上面有 N 个 GBuses, 每一个 bus[i] 连接 A[i]  到 B[i] 两个地点(包含这两个地方).我们想要求 P 个城市,每个城市经过的公交车数量. 输入输出 和 数据规模 如下: There exist some cities that are built alo…

A. Fair Game time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Petya and Vasya decided to play a game. They have n cards (n is an even number). A single integer is written on each card. Befor…

PAT (Advanced Level) Practice 1001-1005 PAT 计算机程序设计能力考试 甲级 练习题 题库:PTA拼题A官网 背景 这是浙大背景的一个计算机考试 刷刷题练练手 在博客更新题解 每五题更新一次 共155题 题目目录 1001 A+B Format (20分) 1002 A+B for Polynomials (25分) 1003 Emergency (25分) 1004 Counting Leaves (30分) 1005 Spell It Right (2…

题目 波雷卡普和瓦西里喜欢简单的逻辑游戏.今天他们玩了一个游戏,这个游戏在一个很大的棋盘上进行,他们每个人有一个棋子.他们轮流移动自己的棋子,波雷卡普先开始.每一步移动中,波雷卡普可以将他的棋子从(x,y) 移动到 (x-1,y) 或者 (x,y-1).而瓦西里可以将他的棋子从(x,y) 移动到 (x-1,y),(x-1,y-1) 或者 (x,y-1).当然他们可以选择不移动. 还有一些其它的限制,他们不能把棋子移动到x或y为负的座标,或者移动到已经被对手占据的座标.最先到达(0,0)的人获胜.…