题目链接:http://poj.org/problem?id=3252 题意: 一个数的二进制表示中0的个数大于等于1的个数则称作Round Numbers.求区间[L,R]内的 Round Numbers的个数. 思路: int c[N][N]; void init(){    int i,j;    FOR0(i,N)     {        c[i][0]=c[i][i]=1;        for(j=1;j<i;j++) c[i][j]=c[i-1][j-1]+c[i-1][j]; …

 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: 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',…

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…

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…

Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 13381   Accepted: 5208 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…

Round Numbers Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 10223   Accepted: 3726 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:[kuangbin带你飞]专题十五 数位DP E - Round Numbers 题意 给定区间.求转化为二进制后当中0比1多或相等的数字的个数. 思路 将数字转化为二进制进行数位dp,由于一个二进制数的最高位必须为1.所以设置变量first记录前面位是否有1,若有1,则可随意放,否则,仅仅可放1. 同一时候.上面的推断决定了搜索时len的大小与二进制本身的长度不一定相等,所以需两个变量对1和0的个数进行记录. 用dp[a][b][c]保存长度a,b个0,c个1的数字个数.记忆化搜索.…

链接: https://vjudge.net/problem/POJ-3252 题意: 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 arbit…

以sample为例子 [2,12]区间的RoundNumbers(简称RN)个数:Rn[2,12]=Rn[0,12]-Rn[0,1] 即:Rn[start,finish]=Rn[0,finish]-Rn[0,start-1] 所以关键是给定一个X,求出Rn[0,X] 现在假设X=10100100  这个X的二进制总共是8位,任何一个小于8位的二进制都小于X 第一部分,求出长度为[0,7]区间内的二进制是RoundNumber的个数  对于一个长度为Len的二进制(最高位为1),如何求出他的Rou…