C. Little Elephant and Shifts Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/problemset/problem/220/C Description The Little Elephant has two permutations a and b of length n, consisting of numbers from 1 to n, inclusive. Let's de…

B. Little Elephant and Array time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output The Little Elephant loves playing with arrays. He has array a, consisting of n positive integers, indexed from…

A. Little Elephant and Function 逆推. B. Little Elephant and Numbers \(O(\sqrt n)\)枚举约数. C. Little Elephant and Problem 排序后对应不相等的位置为2,且两数交换. D. Little Elephant and Array 离线+分块. E. Little Elephant and Shifts 每个数单独考虑. 假设\(x\)在数组\(a\)的位置\(i\),在数组\(b\)的位置\…

题目链接: http://codeforces.com/problemset/problem/258/B B. Little Elephant and Elections time limit per test2 secondsmemory limit per test256 megabytes 问题描述 There have recently been elections in the zoo. Overall there were 7 main political parties: one…

E. Little Elephant and Strings time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output The Little Elephant loves strings very much. He has an array a from n strings, consisting of lowercase Englis…

数位DP部分,不是很难.DP[i][j]前i位j个幸运数的个数.枚举写的有点搓... #include <cstdio> #include <cstring> using namespace std; #define LL __int64 #define MOD 1000000007 ][]; ],num; ]; int dfs(int pos,int pre,int bound) { int ans,i,end; ans = ; ) ; ) return dp[pos][pre]…

题意:有n个串,询问每个串有多少子串在n个串中出现了至少k次. 题解:sam,每个节点开一个set维护该节点的字符串有哪几个串,启发式合并set,然后在sam上走一遍该串,对于每个可行的串,所有的fail都是可行的直接加上len,不可行就往fail上跳. 被for(int i=0;s[i];i++)给骚死了,一直tle.... //#pragma GCC optimize(2) //#pragma GCC optimize(3) //#pragma GCC optimize(4) //#prag…

[Codeforces Round #340 (Div. 2)] vp了一场cf..(打不了深夜的场啊!!) A.Elephant 水题,直接贪心,能用5步走5步. B.Chocolate 乘法原理计数,统计连续的“0”到下一个“1”的个数,然后相乘(第一个1前面的0不能算上).当然还要特判全0的情况. C.Watering Flowers 这题1A.只要按照以到某一个喷泉的距离排序,然后枚举没有被这一个喷泉覆盖到的个数,然后通过第二个喷泉覆盖,贪心一下就好了. D.Polyline 题意杀,还…

Codeforces Round #366 (Div. 2) A I hate that I love that I hate it水题 #I hate that I love that I hate it n = int(raw_input()) s = "" a = ["I hate that ","I love that ", "I hate it","I love it"] for i in ran…

Codeforces Round #354 (Div. 2) Problems     # Name     A Nicholas and Permutation standard input/output 1 s, 256 MB    x3384 B Pyramid of Glasses standard input/output 1 s, 256 MB    x1462 C Vasya and String standard input/output 1 s, 256 MB    x1393…