题意:定义Round Number为二进制表示下0的个数大于等于1的个数的数.求[l,r]中有多少圆环数 我们把二进制位用一颗01二叉树表示,如下: 我们依据二进制位来遍历这颗线段树,如果当前高度对应的位为1,则遍历左右两颗子树,否则遍历左子树.dfs的过程中我们可以用记忆化来减少枚举状态,同时注意到那些最靠左的子树在遍历的过程中是可以重计数的,这样可以减少需要枚举的状态 尽管据说此题是裸的数位dp,可是我还是不会呀QAQ #include<bits/stdc++.h> using names…

 组合数学...(每做一题都是这么艰难) Round Numbers Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 7607 Accepted: 2615 Description The cows, as you know, have no fingers or thumbs and thus are unable to play Scissors, Paper, Stone' (also known as 'Rock, P…

Round Numbers Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 10484 Accepted: 3831 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, Scissors', 'Ro…

Round Numbers Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 8590   Accepted: 3003 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, Scissors',…

Round Numbers Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 14947   Accepted: 6023 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, Scissors',…

题目链接:http://poj.org/problem?id=3252 Round Numbers Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 14640   Accepted: 5881 Description The cows, as you know, have no fingers or thumbs and thus are unable to play Scissors, Paper, Stone' (al…

题目传送门 Round Numbers Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 16439   Accepted: 6776 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, Scis…

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, Scissors', 'Ro, Sham, Bo', and a host of other names) in order to make arbitrary decisions such as who gets…

[BZOJ1662][Usaco2006 Nov]Round Numbers 圆环数 Description 正如你所知,奶牛们没有手指以至于不能玩"石头剪刀布"来任意地决定例如谁先挤奶的顺序.她们甚至也不能通过仍硬币的方式. 所以她们通过"round number"竞赛的方式.第一头牛选取一个整数,小于20亿.第二头牛也这样选取一个整数.如果这两个数都是 "round numbers",那么第一头牛获胜,否则第二头牛获胜. 如果一个正整数N的二…

[POJ3252]Round Numbers 试题描述 The cows, as you know, have no fingers or thumbs and thus are unable to play Scissors, Paper, Stone' (also known as 'Rock, Paper, Scissors', 'Ro, Sham, Bo', and a host of other names) in order to make arbitrary decisions s…