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…

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…

http://www.codechef.com/NOV13 还在比...我先放一部分题解吧... Uncle Johny 排序一遍 struct node{ int val; int pos; }a[MAXN]; int cmp(node a,node b){ return a.val < b.val; } int main(){ int T,n,m; while(cin>>T){ while(T--){ cin>>n; ; i < n ; i++){ cin>&…

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…

比赛链接:https://www.codechef.com/FEB18,题面和提交记录是公开的,这里就不再贴了 Chef And His Characters 模拟题 Chef And The Patents 模拟题 Permutation and Palindrome 模拟题 Car-pal Tunnel 结论比较简单 Broken Clock 求余弦的n倍角,可以用复数的快速幂解决 $cos(a)=x \\ sin(a)=\sqrt{1-x^2} \\ cos(na) = Re((x+\sq…

版权声明:本文作者靖心,靖空间地址:http://blog.csdn.net/kenden23/,未经本作者同意不得转载. https://blog.csdn.net/kenden23/article/details/25105267 You are given an N × N grid initially filled by zeros. Let the rows and columns of the grid be numbered from1 to N, inclusive. There…

题目地址https://www.codechef.com/LTIME44 Nothing in Common 签到题,随便写个求暴力交集就行了 Sealing up 完全背包算出得到长度≥x的最小花费,然后对每条边的长度向上取整分别算一下.本来也是签到题的结果我调了1h+.. Segment Queries 定义连续段为被激活的极长子串,一条线段被激活当且仅当它的两个端点在同一个连续段,用set和并查集维护连续段内的询问,修改时当前点成为新的连续段,并和两侧连续段(如果有)启发式合并一下,O(n…

https://www.codechef.com/JAN17 Cats and Dogs 签到题 #include<cstdio> int min(int a,int b){return a<b?a:b;} int main(){ int T,a,b,c; for(scanf("%d",&T);T;--T){ scanf("%d%d%d",&a,&b,&c); puts(c%==&&c/<=a+…

Let's consider a triangle of numbers in which a number appears in the first line, two numbers appear in the second line, three in the third line, etc. Develop a program which will compute the largest of the sums of numbers that appear on the paths st…