Bridging signals Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 4452    Accepted Submission(s): 2769 Problem Description 'Oh no, they've done it again', cries the chief designer at the Waferlan…

解题思路:题目给出的描述就是一种求最长上升子序列的方法 将该列数an与其按升序排好序后的an'求出最长公共子序列就是最长上升子序列 但是这道题用这种方法是会超时的,用滚动数组优化也超时, 下面是网上找的求LIS的算法 假设要寻找最长上升子序列的序列是a[n],然后寻找到的递增子序列放入到数组b中. (1)当遍历到数组a的第一个元素的时候,就将这个元素放入到b数组中,以后遍历到的元素都和已经放入到b数组中的元素进行比较: (2)如果比b数组中的每个元素都大,则将该元素插入到b数组的最后一个元素,并…

职务地址:HDU 1950 这题是求最长上升序列,可是普通的最长上升序列求法时间复杂度是O(n*n).显然会超时.于是便学了一种O(n*logn)的方法.也非常好理解. 感觉还用到了一点贪心的思想. 详细的见这篇博客吧,写的非常通俗易懂.传送门 代码例如以下: #include <iostream> #include <cstdio> #include <string> #include <cstring> #include <stdlib.h>…

最长上升子序列(LIS)的典型变形,O(n^2)的动归会超时.LIS问题可以优化为nlogn的算法. 定义d[k]:长度为k的上升子序列的最末元素,若有多个长度为k的上升子序列,则记录最小的那个最末元素. 注意d中元素是单调递增的,下面要用到这个性质. 首先len = 1,d[1] = a[1],然后对a[i]:若a[i]>d[len],那么d[++len] = a[i]; 否则,我们要从d[1]到d[len-1]中找到一个j,满足d[j-1]<a[i]<d[j],则根据d的定义,我们需…

题意: 给一个数字序列,要求找到LIS,输出其长度. 思路: 扫一遍+二分,复杂度O(nlogn),空间复杂度O(n). 具体方法:增加一个数组,用d[i]表示长度为 i 的递增子序列的最后一个元素,且该元素总是保持当前最小.初始化d[1]=A[i],当前LIS的长度len=1.从 2 to n,若A[i]>d[len],则d[++len]=A[i],否则,在数组d中找到A[i]应该插入的位置,代替掉那个第一个比它大的数字,比如d[k]<A[i]<=d[k+1],直接将A[i]代替掉d[…

那么一大篇的题目描述还真是吓人. 仔细一读其实就是一个LIS,还无任何变形. 刚刚学会了个二分优化的DP,1A无压力. //#define LOCAL #include <iostream> #include <cstdio> #include <cstring> using namespace std; + ; int a[maxn]; int dp[maxn]; int main(void) { #ifdef LOCAL freopen("1950in.t…

Bridging signals Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 961    Accepted Submission(s): 627 Problem Description 'Oh no, they've done it again', cries the chief designer at the Waferland…

Bridging signals Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 667    Accepted Submission(s): 443 Problem Description 'Oh no, they've done it again', cries the chief designer at the Waferland…

Problem Description 'Oh no, they've done it again', cries the chief designer at the Waferland chip factory. Once more the routing designers have screwed up completely, making the signals on the chip connecting the ports of two functional blocks cross…

用一个数组记下递增子序列长度为i时最小的len[i],不断更新len数组,最大的i即为最长递增子序列的长度 #include<cstdio> #include<algorithm> #define MAX 40010 using namespace std; int a, T, n, len[MAX]; int* lower(int &val, int R) //二分找值,返回下标 { , mid; while (L < R) { mid = R - (R - L +…

http://blog.csdn.net/a_eagle/article/details/7213236 公共序列可以用一个二维数组dp[i][j]保存每个点时的最大数字,本质就是一个双向比较. dp[i][j] = dp[i-1][j-1]+1;(a[i]==b[j]) dp[i][j] = max(dp[i][j-1],dp[i-1][j]);(a[i]!=b[j]) 处理字符串时可以用sf("%s",a+1)来将字符串从1开始保存,这时strlen()也要用a+1 #includ…

题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=1950 Bridging signals Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 3711    Accepted Submission(s): 2337 Problem Description 'Oh no, they've don…

这个博客说的已经很好了.http://blog.csdn.net/shuangde800/article/details/7474903 简单记录一下自己学的: 问题就是求一个数列最长上升子序列的长度. 如果子序列长度相同,那么末尾小的子序列更有可能成为最长的子序列.所以就用一个l数组存当子序列长度为len时最小的末尾元素.如果序列下一个值比l[len]大,说明上升子序列长度增加,那么l[len++]=a[i];如果是小,就想办法把它插入到了l数组中.... HDU 1950 说白了就是求lis…

Bridging signals Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 9234   Accepted: 5037 Description 'Oh no, they've done it again', cries the chief designer at the Waferland chip factory. Once more the routing designers have screwed up co…

Bridging signals Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 2354    Accepted Submission(s): 1536 Problem Description 'Oh no, they've done it again', cries the chief designer at the Waferlan…

代码+题解: 1 //题意: 2 //输出在区间[li,ri]中有多少个数是满足这个要求的:这个数的最长递增序列长度等于k 3 //注意是最长序列,可不是子串.子序列是不用紧挨着的 4 // 5 //题解: 6 //很明显前面最长递增序列的长度会影响到后面判断,而且还要注意我们要采用哪种求最长递增序列的方式(一共有两种, 7 //一种复杂度为nlog(n),另一种是n^2),这里我才采用的是nlog(n)的. 8 // 9 //算法思想: 10 //定义d[k]: 11 //长度为k的上升子序列…

Bridging signals Description 'Oh no, they've done it again', cries the chief designer at the Waferland chip factory. Once more the routing designers have screwed up completely, making the signals on the chip connecting the ports of two functional blo…

Language: Default Bridging signals Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 10762   Accepted: 5899 Description 'Oh no, they've done it again', cries the chief designer at the Waferland chip factory. Once more the routing designers…

Bridging signals Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 2415    Accepted Submission(s): 1570 Problem Description 'Oh no, they've done it again', cries the chief designer at the Waferlan…

欢迎参加——每周六晚的BestCoder(有米!) Bridging signals Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 941    Accepted Submission(s): 614 Problem Description 'Oh no, they've done it again', cries the chief…

Given a binary tree, find the length of the longest consecutive sequence path. The path refers to any sequence of nodes from some starting node to any node in the tree along the parent-child connections. The longest consecutive path need to be from p…

Given an unsorted array of integers, find the length of the longest consecutive elements sequence. For example, Given [100, 4, 200, 1, 3, 2], The longest consecutive elements sequence is [1, 2, 3, 4]. Return its length: 4. Your algorithm should run i…

Bridging signals Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 9441   Accepted: 5166 Description 'Oh no, they've done it again', cries the chief designer at the Waferland chip factory. Once more the routing designers have screwed up co…

Bridging signals Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 12251   Accepted: 6687 Description 'Oh no, they've done it again', cries the chief designer at the Waferland chip factory. Once more the routing designers have screwed up c…

  Description A numeric sequence of ai is ordered if a1 < a2 < ... < aN. Let the subsequence of the given numeric sequence (a1, a2, ..., aN) be any sequence (ai1, ai2, ..., aiK), where 1 <= i1 < i2 < ... < iK <= N. For example, seq…

参考链接:http://www.cnblogs.com/gentleh/archive/2013/03/30/2989958.html 题意:求一个序列的最长上升子序列,及其个数(注意:两个最长上升子序列不能共有同一个数,才能算两个) 思路:用dp+最大流来求,首先用两次循环dp求出最长上升子序列的长度ans,然后就是建图了,可以选择源点为0, 由于数列中的每一个数只能使用一次,构图的时候需要拆点.若有n个数,则拆成2 * n个点,构造源点s=0和汇点t=2*n+1, 将每个点(i)都和自己拆出…

最长连续序列 给定一个未排序的整数数组,找出最长连续序列的长度. 说明 要求你的算法复杂度为O(n) 样例 给出数组[100, 4, 200, 1, 3, 2],这个最长的连续序列是 [1, 2, 3, 4],返回所求长度 4 解题 排序后比较简单,快排O(nlogn) 后面只需要O(n)的时间复杂度求解了 发现原数组里面有重复数字的时候,下面方法行不通了. public class Solution { /** * @param nums: A list of integers * @retu…

题意:给出m个字符串,找出其中的最长公共子序列,如果相同长度的有多个,输出按字母排序中的第一个. 思路:数据小,因此枚举第一个字符串的所有子字符串s,再一个个比较,是否为其它字符串的字串.判断是否为字串的时候,将s的字符依次与其他字符串的字符比较. #include <iostream> #include <stdio.h> #include <string.h> #include <stack> #include <algorithm> usi…

1.链接地址: http://poj.org/problem?id=1631 http://bailian.openjudge.cn/practice/1631 2.题目: Bridging signals Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 9882   Accepted: 5409 Description 'Oh no, they've done it again', cries the chief des…

题目大意就是给一个deque 然后有n个数,依次进行操作,每种操作,你可以把这个数放在deque首部,也可以放在尾部,也可以扔掉不管,但是要保证deque中的数是非递减的.最要求deque中最长能是多少 思路是这样的:对于这个序列,最重要的应该是第一个进去的数是什么,然后以该数为开头的最长不升子序列和以该数为开头的最长不降子序列则可以凑成一个最长的序列,当然这两个序列中可能都出现了该数,也就是发生了重复,所以就要减掉重复的部分,即两个子序列中有该数个数较少的序列中这个数应当被减掉. 然后由于数据…