18.2 Write a method to shuffle a deck of cards. It must be a perfect shuffle—in other words, each of the 52! permutations of the deck has to be equally likely. Assume that you are given a random number generator which is perfect. 这道题让我们实现一个洗牌的算法,实际上洗…

题目链接:https://www.nowcoder.com/acm/contest/141/C 时间限制:C/C++ 1秒,其他语言2秒 空间限制:C/C++ 262144K,其他语言524288K Special Judge, 64bit IO Format: %lld 题目描述 Eddy likes to play cards game since there are always lots of randomness in the game. For most of the cards g…

题目链接:https://www.nowcoder.com/acm/contest/141/C 题目描述 Eddy likes to play cards game since there are always lots of randomness in the game. For most of the cards game, the very first step in the game is shuffling the cards. And, mostly the randomness i…

C: Shuffle Cards 时间限制: 1 Sec  内存限制: 128 MB提交: 3  解决: 3[提交] [状态] [讨论版] [命题人:admin] 题目描述 Eddy likes to play cards game since there are always lots of randomness in the game. For most of the cards game, the very first step in the game is shuffling the c…

链接:https://www.nowcoder.com/acm/contest/141/C来源:牛客网 Eddy likes to play cards game since there are always lots of randomness in the game. For most of the cards game, the very first step in the game is shuffling the cards. And, mostly the randomness in…

题意 牌面初始是1到n,进行m次洗牌,每次抽取一段放到最前面.求最后的序列. 分析 神操作!!!比赛时很绝望,splay技能尚未点亮,不知道怎么用. 殊不知,C++库里有rope神器,即块状链表. 基础函数 #include <ext/rope> using namespace __gnu_cxx; rope test; test.push_back(x);//在末尾添加x test.insert(pos,x);//在pos插入x test.erase(pos,x);//从pos开始删除x个…

链接: https://www.nowcoder.com/acm/contest/141/C 题意: 给出一个n个元素的序列(1,2,...,n)和m个操作(1≤n,m≤1e5),每个操作给出两个数p和s(1≤pi≤n,1≤si≤n-pi+1),表示把序列中从p开始的s个数移到最前面,例如序列[1,2,3,4,5]在p=2,s=3时变成序列[2,3,4,1,5],输出最后的序列. 分析: 对于每个操作,直接把序列拆成三个部分,再重新拼接一下就行.可以用Splay或rope来快速完成这个操作. 代…

题目: 题意:将1~n的数进行m次操作,每次操作将第pi位到pi+si-1位的数字移到第一位,求最后的排列. 思路:现在还没不会写splay,在知道这是splay模板题后找了一波别人的模板,虽然过了,但是感觉自己没学到什么,过几天去学一波splay,再回来把这题重写一次~ 代码实现如下: #include <map> #include <set> #include <cmath> #include <ctime> #include <stack>…

题意: 给出一段序列,每次将从第p个数开始的s个数移到最前面.求最终的序列是什么. 题解: Splay翻转模板题.存下板子. #include <bits/stdc++.h> using namespace std; const int INF = 1e6; ; int n, m; int s, t; int root, sz, tot; ]; int a[N], ans[N]; int get(int x) { ] == x; } void update(int x) { if(x) { s…

Shuffle Cards 链接:https://www.nowcoder.com/acm/contest/141/C来源:牛客网 时间限制:C/C++ 1秒,其他语言2秒 空间限制:C/C++ 262144K,其他语言524288K Special Judge, 64bit IO Format: %lld 题目描述 Eddy likes to play cards game since there are always lots of randomness in the game. For m…