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…

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…

题目链接 找一个范围内二进制中0的个数大于等于1的个数的数的数量.基础的数位dp #include<bits/stdc++.h> using namespace std; #define mem1(a) memset(a, -1, sizeof(a)) ], dp[][][], len; int dfs(int len, int num0, int num1, int f, int first) { //first记录前面是否全部为0 if(!len) { return num0>=nu…

正解:数位$dp$ 解题报告: 传送门$w$ 沉迷写博客,,,不想做题,,,$QAQ$口胡一时爽一直口胡一直爽$QAQ$ 先港下题目大意嗷$QwQ$大概就说,给定区间$[l,r]$,求区间内满足二进制中0的个数小于等于1的个数的数个数 数位$dp$板子,,,? 首先区间转成$[1,r]-[1,l-1]$然后十进制转二进制这个就不港了,,, 然后就考虑$dfs$中要记录哪些东西$QwQ$? 首先依然是一个$pos$一个$lim$,因为01的个数对结果会有影响,所以显然考虑还要记一个$num$表示实…

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]; …

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…

 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',…

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…