Consider nn initial strings of lower case letters, where no initial string is a prefix of any other initial string. Now, consider choosing kk of the strings (no string more than once), and concatenating them together. You can make this many such comp…

A family of nn gnomes likes to line up for a group picture. Each gnome can be uniquely identified by a number 1..n1..n written on their hat. Suppose there are 55 gnomes. The gnomes could line up like so: 1, 3, 4, 2, 51,3,4,2,5. Now, an evil magician…

Consider an n \times mn×m matrix of ones and zeros. For example, this 4 \times 44×4: \displaystyle \begin{matrix} 1 & 1 & 1 & 1 \\ 0 & 1 & 1 & 1 \\ 0 & 1 & 1 & 1 \\ 0 & 1 & 1 & 0 \end{matrix}1000​1111​1111​1…

A. Cut it Out! 枚举第一刀,那么之后每切一刀都会将原问题划分成两个子问题. 考虑DP,设$f[l][r]$表示$l$点顺时针一直到$r$点还未切割的最小代价,预处理出每条边的代价转移即可. 时间复杂度$O(n^3)$. #include<cstdio> #include<cmath> #include<algorithm> using namespace std; const int N=422; const double eps=1e-8; const…

NAIPC 2017 Yin and Yang Stones 75.39% 1000ms 262144K   A mysterious circular arrangement of black stones and white stones has appeared. Ming has been tasked with balancing the stones so that only one black and one white stone remain. Ming has two ope…

(待补) A. Pieces of Parentheses 将括号处理完成后排序,方式参加下面的博客.然后做一遍背包即可. 2018 Multi-University Training Contest 1 Balanced Sequence(贪心) #include <cstdio> #include <cstring> #include <algorithm> #include <iostream> using namespace std; const i…

(待补) A. Fancy Antiques 爆搜. B. Alternative Bracket Notation C. Greetings! D. Programming Team 0/1分数规划 + 树上依赖型背包. E. K-Inversions 将 A 和 B 的相对位置看做多项式,用FFT,最后统计系数. #include <bits/stdc++.h> using namespace std; const double pi = acos(-1.0); struct comp{…

原文链接https://www.cnblogs.com/zhouzhendong/p/AtCoder-SoundHound-Inc-Programming-Contest-2018-E.html 题目传送门 - AtCoder SoundHound Inc. Programming Contest 2018 E 题意 给定一个无向连通图,有 $n$ 个节点 $m$ 条带权边,第 $i$ 条边连接 $x_i,y_i$ ,权值为 $s_i$ ,没有重边.自环. 现在,请你给每一个节点取一个正整数点权…

ACM International Collegiate Programming Contest, Tishreen Collegiate Programming Contest (2018) Syria, Lattakia, Tishreen University, April, 30, 2018 Problem A. Can Shahhoud Solve it? Problem B. Defeat the Monsters Problem C. UCL Game Night Problem…

Battle Royale games are the current trend in video games and Gamers Concealed Punching Circles (GCPC) is the most popular game of them all. The game takes place in an area that, for the sake of simplicity, can be thought of as a two-dimensional plane…