A:Zero Array 题意:两种操作, 1 p v  将第p个位置的值改成v  2  查询最少的操作数使得所有数都变为0  操作为可以从原序列中选一个非0的数使得所有非0的数减去它,并且所有数不能变为负数 思路:考虑第二种操作,显然,最少的操作数肯定是不同数的个数 用map 记录,特殊注意0的存在 #include <bits/stdc++.h> using namespace std; #define N 100010 unordered_map <int, int> mp;…

Solution A:Careful Thief 题意:给出n个区间,每个区间的每个位置的权值都是v,然后找长度为k的区间,使得这个区间的所有位置的权值加起来最大,输出最大权值, 所有区间不重叠 思路:贪心的想法,长度为k的区间的起始点肯定是某个区间的起始点,或者长度为k的区间的结束点肯定是某个区间的结束点. 因为存在最优的答案,它的起点不在某个区间的起点,那么只有两种情况. 1° 不属于任何已知区间 2° 在某个已知区间的内部 首先考虑第一种情况  如果不属于任何已知区间,那么根据贪心,我肯定…

layout: post title: 2018-2019 ACM-ICPC Nordic Collegiate Programming Contest (NCPC 2018) author: "luowentaoaa" catalog: true tags: mathjax: true - codeforces 传送门 付队! B.Baby Bites (签到模拟) 按照题意模拟就行了 int a[maxn]; string s; int main() { std::ios::syn…

Method ringing is used to ring bells in churches, particularly in England. Suppose there are 6 bells that have 6 different pitches. We assign the number 1 to the bell highest in pitch, 2 to the second highest, and so on. When the 6 bells are rung in…

In an unprecedented turn of events, goblins recently launched an invasion against the Nedewsian city of Mlohkcots. Goblins—small, green critters—love nothing more than to introduce additional entropy into the calm and ordered lives of ordinary people…

Ada, Bertrand and Charles often argue over which TV shows to watch, and to avoid some of their fights they have finally decided to buy a video tape recorder. This fabulous, new device can record kk different TV shows simultaneously, and whenever a sh…

You're investigating what happened when one of your computer systems recently broke down. So far you've concluded that the system was overloaded; it looks like it couldn't handle the hailstorm of incoming requests. Since the incident, you have had am…

2017-2018 ACM-ICPC Nordic Collegiate Programming Contest (NCPC 2017) 今日份的训练,题目难度4颗星,心态被打崩了,会的算法太少了,知道要用什么写,但是写不出来啊(抱头痛哭)和猪队友一共写出来3道题,本来I题应该可以写出来的,有向图求最小环输出路径就可以,But,没有板子啊!!!(｡•́︿•̀｡) 赛后补题,补一下I(单独写),D题和E题表示读不懂题,不知道要干嘛,D题是bfs+位运算 ,E题是bfs+优先队列,题意都读不懂,题解…

2018-2019 ACM-ICPC Nordic Collegiate Programming Contest (NCPC 2018)- D. Delivery Delays -二分+最短路+枚举 [Problem Description] 一座城市为无向图带权图,一号节点为披萨餐厅的位置,有\(k\)个人定披萨,按时间先后顺序给出定披萨的时间\(s_i\),地点\(u_i\)以及这个人的披萨在哪个时间做好\(t_i\).问在所有配送方案中,所有人的等待时间的最大值最小是多少?配送顺序完全按照…

2018-2019 ACM-ICPC Nordic Collegiate Programming Contest (NCPC 2018)-E. Explosion Exploit-概率+状压dp [Problem Description] 我方有\(n\)个人,对方有\(m\)个人,每个人都有一个健康值\(h_i\),有\(d\)次攻击,每次随机从所有人中选\(1\)个人,减少其\(1\)健康值.问将对方所有人都消灭的概率是多少? [Solution] 方法\(1\): ​ 将所有人的健康值作为…