【USACO 2013 January Gold】奶牛排队

农夫约翰面对拥有相同血统编号的奶牛队伍,目标是通过移除最多k种血统的奶牛,使连续相同血统编号的奶牛段最大化。本文分析问题本质,提出使用区间动态规划和优先队列求解最大连续段长度的方法。

摘要生成于 C知道 ,由 DeepSeek-R1 满血版支持, 前往体验 >

Description

农夫约翰的N(1 <= N <= 100,000)只奶牛排成了一队,每只牛都用编上了一个“血统编号”,该编号为范围0...1,000,000,000的整数。血统相同的奶牛有相同的编号,也就是可能有多头奶牛是相同的"血统编号"。 
约翰觉得如果连续排列的一段奶牛有相同的血统编号的话,奶牛们看起来会更具有威猛。为了创造这样的连续段,约翰最多能选出k种血统的奶牛,并把他们全部从队列中赶走。请帮助约翰计算这样做能得到的由相同血统编号的牛构成的连续段的长度最大是多少?

Input

第一行,两个空格间隔的整数N和K 
接下来N行, 每行一个整数,表示对应奶牛的血统编号

### USACO 2025 January Contest Information and Problems For individuals interested in participating or learning about the USA Computing Olympiad (USACO) contests, it's important to understand that specific details regarding future events like the USACO 2025 January contest are not yet available as of now. However, based on previous patterns observed in past competitions such as those mentioned in earlier years[^1], some general expectations can be outlined. #### General Structure of USACO Contests Contests typically consist of several problems categorized by difficulty levels—Bronze, Silver, Gold, and Platinum. Participants solve algorithmic challenges within a limited timeframe using programming languages including C++, Java, Python among others. The exact nature of these questions varies widely but often involves complex algorithms and data structures designed to test both coding skills and problem-solving abilities. #### Preparing for Future Competitions To prepare effectively for upcoming contests similar to what might appear in 2025: - **Practice Regularly**: Engage actively with practice problems from previous contests which cover various topics ranging from basic sorting techniques to advanced graph theory concepts. - **Understand Algorithms & Data Structures**: Deepen knowledge around key areas frequently tested during these exams; this includes dynamic programming, greedy strategies, depth-first search (DFS), breadth-first search (BFS), etc.[^3] - **Participate in Mock Tests**: Join mock testing sessions offered through official platforms or community-driven initiatives where participants attempt solving under exam conditions. Here’s an example code snippet demonstrating how one could approach implementing DFS—a common technique used across many competitive programming tasks: ```cpp void dfs(int node, vector<bool>& visited, const vector<vector<int>>& adjList){ cout << "Visiting Node: " << node << endl; visited[node] = true; // Traverse all adjacent nodes recursively if they haven't been visited already for(auto neighbor : adjList[node]){ if(!visited[neighbor]) dfs(neighbor, visited, adjList); } } ``` --related questions-- 1. What resources exist specifically tailored towards preparing for USACO? 2. How does understanding different types of graphs benefit performance in computational olympiads? 3. Can you provide examples of other international computing olympiads comparable to USACO? 4. In terms of time management, what tips would help maximize efficiency while attempting multiple challenging problems simultaneously?
评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值