Given an array A1,A2...AN, you have to print the size of the largest contiguous subarray such that LCM of all integers in that subarray is equal to the product of all integers in that subarray. Formally, For a subarray Ai,Ai+1...Aj where 1 ≤ i < j ≤…

The Little Elephant likes permutations. This time he has a permutation A[1], A[2], ..., A[N] of numbers 1, 2, ...,N. He calls a permutation A good, if the number of its inversions is equal to the number of its local inversions. The number of inversio…

https://www.codechef.com/FEB14/problems/LEMOVIE 题意: 对于一个序列,定义其“激动值”为序列中严格大于前面所有数的元素的个数.给定n个数p1;,p2... pn,求这n个数的所有排列中,激动值不超过k的个数.$1 k \le n \le 200,1 \le pi \le 200$ 这种题有一个很神的想法: 把排列按某种顺序往里插入,使得后不会影响前 对于本题,先离散化去重后,从大到小插入,后插入的元素不会影响已经插入的元素严格大于前面所有数 $f[…

https://www.codechef.com/problems/LEMOUSE 题意: 有一个n *m的网格.有一头大象,初始时在(1,1),要移动到(n,m),每次只能向右或者向下走.有些格子中有老鼠,如果大象所在的格子和某个有老鼠的格子的曼哈顿距离$\e$1,大象就会被那只老鼠吓到.求一条移动路径,使得吓到过大象的老鼠数量最少.n;m $\le$100. 开始刷济南集训hzc的课件啦! 最简单的一道$DP$ 一只老鼠只会吓大象一次$f[i][j][0/1]$记录从左还是上走来的,转移时讨…

The Little Elephant from the Zoo of Lviv currently is on the military mission. There are N enemy buildings placed in a row and numbered from left to right strating from 0. Each building i (except the first and the last) has exactly two adjacent build…

类似墨墨的等式 设f[2][j][k]表示a[i].c是否和当前颜色相同,到当前枚举到的颜色为止,颜色数为j,对mnv取模为k的最小数 这是个无限循环背包,用spfa优化 #include<cstdio> #include<iostream> #include<cstring> #include<cstdlib> #include<algorithm> #include<cmath> #include<map> using…

并不是很正规的.每个人自愿参与自愿退出,马哥找题(马哥超nice么么哒). 放假第一周与放假结束前一周 2015-01-26 http://acm.hust.edu.cn/vjudge/contest/view.action?cid=68304#overview password: scau0126     ID Origin Title   13 / 29 Problem A CodeChef SUBGCD Subarray GCD   8 / 50 Problem B CodeChef SU…

Read problems statements in Mandarin Chineseand Russian. Little Elephant from Zoo of Lviv likes to watch movies. There are N different movies (numbered from 0 to N − 1) he wants to watch in some order. Of course, he will watch each movie exactly once…

3514: Codechef MARCH14 GERALD07加强版 Time Limit: 60 Sec  Memory Limit: 256 MBSubmit: 1288  Solved: 490[Submit][Status][Discuss] Description N个点M条边的无向图,询问保留图中编号在[l,r]的边的时候图中的联通块个数. Input 第一行四个整数N.M.K.type,代表点数.边数.询问数以及询问是否加密.接下来M行,代表图中的每条边.接下来K行,每行两个整数L…

有时我们在实际分类数据挖掘中经常会遇到,类别样本很不均衡,直接使用这种不均衡数据会影响一些模型的分类效果,如logistic regression,SVM等,一种解决办法就是对数据进行均衡采样,这里就提供了一个建议代码实现,要求输入和输出数据格式为Label+Tab+Features, 如Libsvm format -1 1:0.875 2:-1 3:-0.333333 4:-0.509434 5:-0.347032 6:-1 7:1 8:-0.236641 9:1 10:-0.935484 1…