CF1270G Subset with Zero Sum】的更多相关文章

首先一定要从每个数的范围 \(i - n \le a_i \le i - 1\) 入手,最开始是这样一个想法,不难发现对于每个 \(i\) 都能选 \(n\) 个数,并且能选的右端点在 \(i - 1\),那么我们可以吧每个 \(i\) 前移一位,实际上就是 \(0 \sim n - 1\) 这些位置上选没选数,而如果这个位置上没选那么就一定选在了前面,实际上这样还是非常不好做,于是我考虑只选择了一个负数的情况,发现还是不能发现一种简便的方法来找出这个集合,因此我们需要换一种方式思考. 既然分析…
2021-10-14 P2577 [ZJOI2004]午餐 2021-10-13 CF815C Karen and Supermarket(小小紫题,可笑可笑) P6748 『MdOI R3』Fallen Lord(sort(a+1,a+1+n,greater<int>()); 真好用) P4161 [SCOI2009]游戏 P1707 刷题比赛 2021-10-12 CF1573A Countdown P2717 寒假作业 P7868 [COCI2015-2016#2] VUDU P1660…
  继续讲故事~~   上次讲到我们的主人公丁丁,用神奇的动态规划法解决了杂货店老板的两个找零钱问题,得到了老板的肯定.之后,他就决心去大城市闯荡了,看一看外面更大的世界.   这天,丁丁刚回到家,他的弟弟小连就拦住了他,"老哥,有个问题想请教你."对于一向数学见长的小连,这次竟然破天荒的来问自己问题,丁丁感到不可思议:他俩一个以计算机见长,一个以数学见长,各自心里都有点小骄傲,不会轻易地向对方问问题.丁丁迟疑了一会儿,慢慢说道:"有什么问题是我们数学小天才解决不了的?&qu…
Given an array of integers nums and a positive integer k, find whether it's possible to divide this array into k non-empty subsets whose sums are all equal. Example 1: Input: nums = [4, 3, 2, 3, 5, 2, 1], k = 4 Output: True Explanation: It's possible…
CF1249F Maximum Weight Subset 洛谷评测传送门 题目描述 You are given a tree, which consists of nn vertices. Recall that a tree is a connected undirected graph without cycles. Example of a tree.Vertices are numbered from 11 to nn . All vertices have weights, the…
E - The Values You Can Make Description Pari wants to buy an expensive chocolate from Arya. She has n coins, the value of the i-th coin is ci. The price of the chocolate is k, so Pari will take a subset of her coins with sum equal to k and give it to…
E - The Values You Can Make Description Pari wants to buy an expensive chocolate from Arya. She has n coins, the value of the i-th coin is ci. The price of the chocolate is k, so Pari will take a subset of her coins with sum equal to k and give it to…
C - NP-Hard Problem Crawling in process... Crawling failed Time Limit:2000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Description Pari wants to buy an expensive chocolate from Arya. She has n coins, the value of the i-th coin is ci…
C. The Values You Can Make time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Pari wants to buy an expensive chocolate from Arya. She has n coins, the value of the i-th coin is ci. The price…
E. The Values You Can Make     Pari wants to buy an expensive chocolate from Arya. She has n coins, the value of the i-th coin is ci. The price of the chocolate is k, so Pari will take a subset of her coins with sum equal to k and give it to Arya. Lo…
先放上特殊的字符 Backtick Symbol - `    反引号 同撇 Double Quotes - "      双引号 Square Brackets - [  中括号 如    CREATE TABLE tst1 ([value] INT); CREATE TABLE tst2 (`value` INT); CREATE TABLE tst3 ("value" INT); 如果没有转义的话 报如下错误 然后是关键字 ABSOLUTE ACTION ADD ADD…
题目链接: 题目 E. The Values You Can Make time limit per test:2 seconds memory limit per test:256 megabytes 问题描述 Pari wants to buy an expensive chocolate from Arya. She has n coins, the value of the i-th coin is ci. The price of the chocolate is k, so Pari…
传送门1(UVa): https://uva.onlinejudge.org/external/13/1354.pdf 传送门2(GOJ): http://acm.gdufe.edu.cn/Problem/read/id/1320 题意: 长度限制 r (1 < r < 10), 给 n (1 <= n <= 6) 个砝码,组成平衡(考虑重量和力臂)的天平,求天平最长能多长. 2015个人选拔赛#6 1004 比赛的时候完全不知道怎么做,比赛完两天重新看一遍有点思路就是敲不出来(弱…
C. Do you want a date? time limit per test:2 seconds memory limit per test:256 megabytes input:standard input output:standard output Leha decided to move to a quiet town Vičkopolis, because he was tired by living in Bankopolis. Upon arrival he immedi…
这题很难,这几天一直在想这题,最后看了汝佳大哥的代码才明白.贴上代码 // UVa1354 Mobile Computing // Rujia Liu #include<cstdio> #include<cstring> #include<vector> using namespace std; struct Tree { double L, R; // distance from the root to the leftmost/rightmost point Tre…
C. The Values You Can Make time limit per test:2 seconds memory limit per test:256 megabytes input:standard input output:standard output Pari wants to buy an expensive chocolate from Arya. She has n coins, the value of the i-th coin is ci. The price…
题目描述 求一张有向图的强连通生成子图的数目对 $10^9+7$ 取模的结果. 题解 状压dp+容斥原理 设 $f[i]$ 表示点集 $i$ 强连通生成子图的数目,容易想到使用总方案数 $2^{sum[i]}$ 减去不为强连通图的方案数得到强连通图的方案数,其中 $sum[i]$ 表示点集 $i$ 中边的数目. 考虑什么样的图不是强连通图:缩点后入度为0的强连通分量对应的点集不是全集. 枚举这些入度为0的强连通分量对应的点集,由于无法保证只有这些点构成的入度为0的强连通分量,因此需要进一步容斥.…
A. Straight «A» time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Noora is a student of one famous high school. It's her final year in school — she is going to study in university next year.…
C. Do you want a date?   2 seconds 256 megabytes   Leha decided to move to a quiet town Vičkopolis, because he was tired by living in Bankopolis. Upon arrival he immediately began to expand his network of hacked computers. During the week Leha manage…
Complexity Class Computational problem Decision Problems Model of computation Time-complexity classes Space-complexity classes P, NP, co-NP, NPC, NP-hard P NP co-NP NPC NP-hard Euler图 Reference 用计算机解决问题时,我们总希望算法足够快,因为任何时候资源都是相对不足的,特别是时间资源. P vs NP是信息…
C. Do you want a date? time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output   Leha decided to move to a quiet town Vičkopolis, because he was tired by living in Bankopolis. Upon arrival he imme…
A. Straight «A» time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Noora is a student of one famous high school. It's her final year in school — she is going to study in university next year.…
题目 分析:枚举子集以及关于该子集的补集,然后用子集去暴力构造一颗二叉树,注意左边的最远距离不一定来自于左子树,右边的最远距离也不一定来自于右子树 #include "iostream" #include "cstdio" #include "cstring" #include "string" #include "vector" using namespace std; ; <<maxn];…
题目链接: E. The Values You Can Make time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Pari wants to buy an expensive chocolate from Arya. She has n coins, the value of the i-th coin is ci. The…
C. Do you want a date? time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Leha decided to move to a quiet town Vičkopolis, because he was tired by living in Bankopolis. Upon arrival he immedi…
time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Pari wants to buy an expensive chocolate from Arya. She has n coins, the value of the i-th coin is ci. The price of the chocolate is k, so P…
Linear basis is a relatively easy to learn but may not be useful algorithm. Below are two blogs that I think are better. Linear-based talk Detailed Explanation of Linear Base The complexity of the linear basis is very good, if it is inserted normally…
SVD 参考 https://www.zybuluo.com/rianusr/note/1195225 1 推荐系统概述   1.1 项目安排     1.2 三大协同过滤   1.3 项目开发工具   2 Movielens数据集简介 MovieLens是推荐系统常用的数据集: MovieLens数据集中,用户对自己看过的电影进行评分,分值为1~5: MovieLens包括两个不同大小的库,适用于不同规模的算法: ·小规模的库事943个独立用户对1682部电影做的10000次评分的数据: ·大…
Codeforces 题目传送门 & 洛谷题目传送门 首先很容易注意到一件事,那就是对于所有 \(f(S)\) 可能成为 \(x\) 的集合 \(S\),必定有 \(\forall y\in S\),\(x\) 的每一位都 \(\le y\) 的对应位,于是我们考虑设 \(h(x)\) 表示所有满足 \(x\) 的对应位都小于 \(f(S)\) 的对应位的 \(S\) 的贡献之和,显然我们求出 \(h(x)\) 之后,可以把 \(0\sim 999999\) 中的数都看作一个拥有六个维度,每个维…
Given a non-empty array containing only positive integers, find if the array can be partitioned into two subsets such that the sum of elements in both subsets is equal. Note: Both the array size and each of the array element will not exceed 100. Exam…