To CF 这道题依题意可得最终答案为序列长度-最长子序列长度. 数据范围至 \(100000\) 用 \(O(n^2)\) 的复杂度肯定会炸. 用 \(O(nlogn)\) 的复杂度却在第 \(21\) 个测试点莫名出错. 于是换一种思路可得 \(dp[s]=dp[s-1]+1\) 即类似于求最长子序列长度. 最后用序列长度-最长子序列长度即为答案. #include<cstdio> #include<iostream> using namespace std; int n; i…

题目描述 An infinitely long railway has a train consisting of n cars, numbered from 1 to n (the numbers of all the cars are distinct) and positioned in arbitrary order. David Blaine wants to sort the railway cars in the order of increasing numbers. In on…

传送门 题目大意 给出一个 1 到 n 的排列,每次操作可以将某个位置的数字移动到最前面或最后面,求将排列从小到大排序的最小操作次数 如:4 1 2 5 3 操作1:将5和3换一下变成4 1 2 3 5 操作2:将1 2 3和 4换一下变成 1 2 3 4 5 在此后即完成要求.所以最小操作次数为2. 输入: 第一行 为长度 nnn ; 第二行为原来的顺序两个数之间有空格. 输出: 最小操作次数 解题思路 因为要从小到大排序,所以我们很自然能想到lis,但是也很容易举出反例.如1 2 4 5 3…

C. Sorting Railway Cars   An infinitely long railway has a train consisting of n cars, numbered from 1 to n (the numbers of all the cars are distinct) and positioned in arbitrary order. David Blaine wants to sort the railway cars in the order of incr…

C. Sorting Railway Cars Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://www.codeforces.com/contest/606/problem/C Description An infinitely long railway has a train consisting of n cars, numbered from 1 to n (the numbers of all the cars are distin…

Sorting Railway Cars time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output An infinitely long railway has a train consisting of n cars, numbered from 1 to n (the numbers of all the cars are dist…

A. Sorting Railway Cars time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output An infinitely long railway has a train consisting of n cars, numbered from 1 to n (the numbers of all the cars are d…

C. Sorting Railway Cars time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output An infinitely long railway has a train consisting of n cars, numbered from 1 to n (the numbers of all the cars are d…

C. Sorting Railway Cars time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output An infinitely long railway has a train consisting of n cars, numbered from 1 to n (the numbers of all the cars are d…

http://acm.hust.edu.cn/vjudge/contest/view.action?cid=102419#problem/E Description An infinitely long railway has a train consisting of n cars, numbered from 1 to n (the numbers of all the cars are distinct) and positioned in arbitrary order. David B…

Description An infinitely long railway has a train consisting of n cars, numbered from 1 to n (the numbers of all the cars are distinct) and positioned in arbitrary order. David Blaine wants to sort the railway cars in the order of increasing numbers…

time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output An infinitely long railway has a train consisting of n cars, numbered from 1 to n (the numbers of all the cars are distinct) and positioned…

Description An infinitely long railway has a train consisting of n cars, numbered from 1 to n (the numbers of all the cars are distinct) and positioned in arbitrary order. David Blaine wants to sort the railway cars in the order of increasing numbers…

题目链接: http://www.codeforces.com/contest/606/problem/C 一道dp问题,我们可以考虑什么情况下移动,才能移动最少.很明显,除去需要移动的车,剩下的车,一定是相差为1的递增序列,而且这个序列一定也是最长的,例如4 1 2 5 3, 4 5是需要移动的,不移动的序列是1 2 3,所以我们只要求出这一最长的递增序列,用n去减就可以了. dp[i]是以i为结尾,最长的递增序列,所以dp[i] = dp[i-1]+1,求最大即为所求结果. #include…

其实就是求总长度 - 一个最长“连续”自序列的长度 最长“连续”自序列即一个最长的lis,并且这个lis的值刚好是连续的,比如4,5,6... 遍历一遍,贪心就是了 遍历到第i个时,此时值为a[i],如果a[i]-1在前面已经出现过了,则len[a[i]] = len[a[i-1]]+1 否则len[a[i]] = 1 #include <cstdio> #include <algorithm> #include <cstring> #include <iostr…

题意:给你一串数,没个数只能往前提到首位,或则往后放末尾.问最少步骤使操作后的序列成上升序列. 思路:最长连续子序列. #include<iostream> #include<stdio.h> #include<stdlib.h> #include<memory.h> #include<string.h> #include<algorithm> #include<cmath> ; ; using namespace std…

早起一水…… 题意看着和蓝桥杯B组的大题第二道貌似一个意思…… 不过还是有亮瞎双眼的超短代码…… 总的意思呢…… 就是最长增长子序列且增长差距为1的的…… 然后n-最大长度…… 这都怎么想的…… 希望今天的省选可以亮光乍现~~~ #include<stdio.h> #include<iostream> #include<string.h> #include<algorithm> #include<math.h> using namespace s…

求一下最长数字连续上升的子序列长度,n-长度就是答案 O(n)可以出解,dp[i]=dp[i-1]+1,然后找到dp数组最大的值. #include<cstdio> #include<cstring> #include<cmath> #include<algorithm> using namespace std; const int INF=0x7FFFFFFF; +; int dp[maxn]; int n,x; int main() { while(~s…

题目链接:http://codeforces.com/contest/605/problem/A 大意是对一个排列进行排序,每一次操作可以将一个数字从原来位置抽出放到开头或结尾,问最少需要操作多少次可以将原排列变为有序. 一个比较很想当然的算法是用长度减去最长上升子序列,但这是错误的. 反例: 5 1 3 4 5 2 按照n-lis,会得出答案1,但显然这是做不到的,答案应是2 正解应当是考虑最终变为有序时,所有未经操作的数字,应当是连续的.所以要使得操作次数最少就要求在原来数列中位置递增的最长…

C - Sorting Railway Cars   Time Limit:2000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u   CodeForces 606C Description An infinitely long railway has a train consisting of n cars, numbered from 1 to n (the numbers of all the cars are…

Little Elephant and Broken Sorting 怎么感觉这个状态好难想到啊.. dp[ i ][ j ]表示第 i 个数字比第 j 个数字大的概率.转移好像比较显然. #include<bits/stdc++.h> #define LL long long #define LD long double #define ull unsigned long long #define fi first #define se second #define mk make_pair…

题目描述 Jasio 是一个三岁的小男孩,他最喜欢玩玩具了,他有n 个不同的玩具,它们都被放在了很高的架子上所以Jasio 拿不到它们. 为了让他的房间有足够的空间,在任何时刻地板上都不会有超过k 个玩具. Jasio 在地板上玩玩具. Jasio'的妈妈则在房间里陪他的儿子. 当Jasio 想玩地板上的其他玩具时,他会自己去拿,如果他想玩的玩具在架子上,他的妈妈则会帮他去拿,当她拿玩具的时候,顺便也会将一个地板上的玩具放上架子使得地板上有足够的空间. 他的妈妈很清楚自己的孩子所以他能够预料到J…

水 A - Magic Spheres 这题也卡了很久很久,关键是“至少”,所以只要判断多出来的是否比需要的多就行了. #include <bits/stdc++.h> using namespace std; #define lson l, mid, o << 1 #define rson mid + 1, r, o << 1 | 1 typedef long long ll; const int N = 1e5 + 5; const int INF = 0x3f3f…

Sorting Railway Cars CodeForces - 605A 一辆列车有N节车厢,编号为1...N(每节车厢编号都不同),并且他们的排列是混乱的.李老湿想要把这N节车厢重新排列为升序排列,每次调整他可以挑出一节车厢放在车头或者车尾.可是李老湿太懒了,所以他想知道最少需要调整多少次就可以完成重新排列!为了解决这个问题,李老湿决定求助学弟们. Input 第一行:一个整数N( 1<=N<=100000) 表示列车的车厢数 第二行:N个整数pi( 1<=pi<=n,   …

                                                               C. Sorting Railway Cars time limit per test: 2 seconds memory limit per test: 256 megabytes input: standard input output: standard output An infinitely long railway has a train consisting…

C. Nephren gives a riddle   time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output What are you doing at the end of the world? Are you busy? Will you save us? Nephren is playing a game with littl…

RESTful API最佳实践 RESTful API 概述 基本概念 REST 英文全称:Representational State Transfer,直译为:表现层状态转移.首次是由Roy Thomas Fielding在他2000年的博士论文中提出. REST是一种描述网络中client和server之间的资源交互方式. 而RESTful API就是完全遵循REST方式的一套API设计规范,简单来说,通过API来描述资源的访问方式: 通过HTTP URL描述访问什么资源 通过HTTP M…

[题解]Railway [Uva10263] 传送门:\(\text{Railway [Uva10263]}\) [题目描述] 给出点 \(M\) 以及一个由 \(n\) 条线段依次相连的类曲形图(由 \(n+1\) 个点构成),求该"曲形"图中距离点 \(M\) 最近的点 \(P\) 的坐标(\(P\) 可以在任意一条线段上). [输入] 输入多组数据,读至 \(EOF\) 结束. 每组数据第一.二行为点 \(M\) 的坐标,接下来一个整数 \(n\) 以及 \(2(n+1)\) 行…

A non-empty zero-indexed array A consisting of N integers is given. The consecutive elements of array A represent consecutive cars on a road. Array A contains only 0s and/or 1s: 0 represents a car traveling east, 1 represents a car traveling west. Th…

题目传送门 太弱了,只能写写A题的题解 题意 给你一个 $n·n$ 的矩阵,翻车分三种情况: 如果 $a_i,_j=1$ ,记录第 $i$ 辆车 如果 $a_i,_j=2$ ,记录第 $j$ 辆车 如果 $a_i,_j=3$ ,记录第 $i$ 和 $j$ 辆车 问最后总共记录多少辆车(不重复)?它们分别是第几辆? 思路 这题可以用set (好喜欢用set),因为set可以去重,用在这里可以有效减少时间复杂度. 一边输入一边将 $i$ 或 $j$ 存入set并标记bool数组,然后输出 n-set…