POJ 2346:Lucky tickets】的更多相关文章

Lucky tickets Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 3247   Accepted: 2136 Description The public transport administration of Ekaterinburg is anxious about the fact that passengers don't like to pay for passage doing their best…
Lucky and Good Months by Gregorian Calendar Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 1619   Accepted: 539 Description Have you ever wondered why normally an year has 365 days, not 400 days? Why August have 31 days, but February ha…
Lucky ticketsTime Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://acm.hust.edu.cn/vjudge/contest/view.action?cid=86686#problem/J Description Everyone knows that in less than a month the Ice Hockey World Championship will start in Minsk. But few of the…
All bus tickets in Berland have their numbers. A number consists of n digits (n is even). Only k decimal digits d1,d2,…,dk can be used to form ticket numbers. If 0 is among these digits, then numbers may have leading zeroes. For example, if n=4 and o…
题目传送门 /* 题意:转换就是求n位数字,总和为s/2的方案数 DP+高精度:状态转移方程:dp[cur^1][k+j] = dp[cur^1][k+j] + dp[cur][k]; 高精度直接拿JayYe的:) 异或运算的规则: 0⊕0=0,0⊕1=1 1⊕0=1,1⊕1=0 口诀:相同取0,相异取1 */ #include <cstdio> #include <cstring> #include <string> #include <iostream>…
Lucky Tickets Time Limit: 2000ms Memory Limit: 16384KB This problem will be judged on Ural. Original ID: 103664-bit integer IO format: %lld      Java class name: (Any)   You are given a number 1 ≤ N ≤ 50. Every ticket has its 2N-digit number. We call…
Lucky tickets Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 3298 Accepted: 2174 Description The public transport administration of Ekaterinburg is anxious about the fact that passengers don't like to pay for passage doing their best to a…
http://poj.org/problem?id=3321 http://acm.hdu.edu.cn/showproblem.php?pid=3887 POJ 3321: 题意:给出一棵根节点为1的边不一定的树,然后给出问题:询问区间和 或者 节点值更新. HDU 3887: 题意:和POJ 3321的题意差不多,只不过对每个节点询问不包含该节点的区间和 思路:今天才学了下才知道有DFS序这种东西,加上树状数组处理一下区间和 和 节点更新. DFS序大概就是我们在DFS遍历一棵树的时候,在进…
POJ 3252:Round Numbers Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 10099 Accepted: 3669 Description The cows, as you know, have no fingers or thumbs and thus are unable to play Scissors, Paper, Stone' (also known as 'Rock, Paper, Sciss…
题目链接:http://poj.org/problem?id=2346 思路分析:使用动态规划解法:设函数 d( n, x )代表长度为n且满足左边n/2位的和减去右边n/2位的和为x的数的数目. 将一个长度为n的数看做n个数字 A1, A2....An ( 0 <= Ai <= 9  ),将字符分为两个集合{ A1, A2....An/2 } 与 { An/2+1.....An }; 问题转换为求集合中元素和相等的数目.先从每个集合中选出一个元素,求它们差为a的可能数目,即d( 2, a )…