求一个数列的最长上升序列 动态规划法:O(n^2) //DP int LIS(int a[], int n) { int DP[n]; int Cnt=-1; memset(DP, 0, sizeof(DP)); for(int i=0; i<n; i++ ) { for(int j=0; j<i; j++ ) { if( a[i]>a[j] ) { DP[i] = max(DP[i], DP[j]+1); Cnt = max(DP[i], Cnt);//记录最长序列所含元素的个数 }…

We are all familiar with sorting algorithms: quick sort, merge sort, heap sort, insertion sort, selection sort, bubble sort, etc. But sometimes it is an overkill to use these algorithms for an almost sorted array. We say an array is sorted if its ele…

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…

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 a binary tree, you need to find the length of Longest Consecutive Path in Binary Tree. Especially, this path can be either increasing or decreasing. For example, [1,2,3,4] and [4,3,2,1] are both considered valid, but the path [1,2,4,3] is not v…

目录 Attention演进(RNN&LSTM&GRU&Seq2Seq + Attention机制) LSTM GRU Seq2Seq + Attention机制 Attention机制(self-attention) 变种之Memory-based Attention 变种之Soft/Hard Attention 变种之self-attention Scaled Dot-Product Attention Multi-Head Attention 序列建模有哪些经典论文? SDM…

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…

Racing Gems   You are playing a racing game.  Your character starts at the x axis (y = 0) and proceeds up the      race track, which has a boundary at the line x = 0 and another at x = w.  You  may start the race       at any horizontal position you…

转载请注明来自souldak,微博:@evagle 题目(来自leetcode): 给你一个n个数的乱序序列,O(N)找出其中最长的连续序列的长度. 例如给你[100, 4, 200, 1, 3, 2],那么最长的连续序列为[1, 2, 3, 4],所以返回4. 思路: 最简单直接的想法是:将数组排序,然后扫一遍排好序的序列,从中找出最长的即可,这样的话时间是O(nlogn)+O(n),显然不符合题目要求,会超时. 那怎么样不排序就能做出来呢? 我们先抛开算法,想想自己会怎么找,当数组很小,你可…