题目大意:给你一堆n张牌(数字可以相同),你只能从上面取牌,如果是当前牌堆里面最小的值则拿走, 否则放到底部,问你一共要操作多少次. 思路:讲不清楚,具体看代码.. #include<bits/stdc++.h> #define pb push_back #define ll long long using namespace std; ; ll n,mxi[N],a[N];//a[i]保存原始数据,mxi[i]保存大小为i的牌最下面一张的编号 vector<ll> p[N];//…

Educational Codeforces Round 67 D. Subarray Sorting 传送门 题意: 给出两个数组\(a,b\),现在可以对\(a\)数组进行任意次排序,问最后能否得到\(b\)数组. \(n\leq 3*10^5,a\leq n.\) 思路: 首先注意到任意次排序可以等价于任意次交换两个相邻的数,当且仅当前一个数不小于后面一个数. 我一开始想的是按权值从小到大来构造,但最终发现这条路走不通. 正解就是比较直接的思路,按位置一个一个来匹配. 对于一个\(b_i\…

E. Cards Sorting time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Vasily has a deck of cards consisting of n cards. There is an integer on each of the cards, this integer is between 1 and 10…

Cards Sorting time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Vasily has a deck of cards consisting of n cards. There is an integer on each of the cards, this integer is between 1 and 100 0…

http://codeforces.com/contest/831 A. Unimodal Array time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Array of integers is unimodal, if: it is strictly increasing in the beginning; after that…

A. Unimodal Array time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Array of integers is unimodal, if: it is strictly increasing in the beginning; after that it is constant; after that it is…

我只能说真的看不懂题解的做法 我的做法就是线段树维护,毕竟每个数的顺序不变嘛 那么单点维护 区间剩余卡片和最小值 每次知道最小值之后,怎么知道需要修改的位置呢 直接从每种数维护的set找到现在需要修改的数的在初始卡片的位置 #include <cstdio> #include <cstdlib> #include <cstring> #include <ctime> #include <algorithm> #include <iostre…

Splay要支持找最左侧的最小值所在的位置.类似线段树一样处理一下,如果左子树最小值等于全局最小值,就查左子树:否则如果当前节点等于全局最小值,就查当前节点:否则查右子树. 为了统计答案,当然还得维护子树大小的函数. 找到位置以后,直接将左右子树交换即可.不需要打标记. 删除节点时,直接将其前驱(是指序列下标的前驱,就是将待删除节点Splay到根后,左子树的最右节点)Splay到根,将其后继(类似)Splay到根的儿子. 然后将后继的左儿子删除即可. 别忘了及时Maintain(); 这份代码的…

Vasily has a deck of cards consisting of n cards. There is an integer on each of the cards, this integer is between 1 and 100 000, inclusive. It is possible that some cards have the same integers on them. Vasily decided to sort the cards. To do this,…

A:链接:http://codeforces.com/contest/831/problem/A 解题思路: 从前往后分别统计递增,相等,递减序列的长度,如果最后长度和原序列长度相等那么就输出yes: 实现代码: #include<bits/stdc++.h> using namespace std; int main() { ,a[]; cin>>m; ;i<m;i++){ cin>>a[i]; } ;i<m-;i++){ ]) ans++; else b…