New Skateboard

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Codeforces CF#628 Education 8 B. New Skateboard

B. New Skateboard time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Max wants to buy a new skateboard. He has calculated the amount of money that is needed to buy a new skateboard. He left a…

CF 628B New Skateboard --- 水题

CD 628B 题目大意:给定一个数字(<=3*10^5),判断其能被4整除的连续子串有多少个解题思路:注意一个整除4的性质: 若bc能被4整除,则a1a2a3a4...anbc也一定能被4整除: 利用这个性质,先特判第一位数字是否能被4整除,可以则++cnt, 之后从第二位数字开始,设当前位为i,先判断a[i]能否被4整除,可以则++cnt, 再判断a[i-1]*10+a[i]能否被4整除,可以则cnt = cnt + (i) 相关证明: 设一整数各个位置为a1,a2,a3,...,an,b…

CodeForces 628B New Skateboard

New Skateboard time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Max wants to buy a new skateboard. He has calculated the amount of money that is needed to buy a new skateboard. He left a cal…

CodeForces628-B.New Skateboard

B. New Skateboard time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Max wants to buy a new skateboard. He has calculated the amount of money that is needed to buy a new skateboard. He left a…

Educational Codeforces Round 8 B. New Skateboard 暴力

B. New Skateboard 题目连接: http://www.codeforces.com/contest/628/problem/A Description Max wants to buy a new skateboard. He has calculated the amount of money that is needed to buy a new skateboard. He left a calculator on the floor and went to ask som…

Codeforces 628 B.New Skateboard

B. New Skateboard time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Max wants to buy a new skateboard. He has calculated the amount of money that is needed to buy a new skateboard. He lef…

codeforces 628B B. New Skateboard (数论)

B. New Skateboard time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Max wants to buy a new skateboard. He has calculated the amount of money that is needed to buy a new skateboard. He left a…

CodeForces 628B New Skateboard 思维

B. New Skateboard time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Max wants to buy a new skateboard. He has calculated the amount of money that is needed to buy a new skateboard. He left a…

Codefroces B. New Skateboard

B. New Skateboard time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Max wants to buy a new skateboard. He has calculated the amount of money that is needed to buy a new skateboard. He left a…

Max wants to buy a new skateboard. He has calculated the amount of money that is needed to buy a new skateboard. He left a calculator on the floor and went to ask some money from his parents. Meanwhile his little brother Yusuf came and started to pre…

Codeforces 682B New Skateboard（DP）

题目大概说给一个数字组成的字符串问有几个子串其代表的数字(可以有前导0)能被4整除. dp[i][m]表示字符串0...i中mod 4为m的后缀的个数通过在i-1添加str[i]字符转移,或者以str[i]为新后缀的开头转移 #include<cstdio> #include<cstring> using namespace std; ]; ][]; int main(){ scanf("%s",str); ; str[i]; ++i){ ++d[i][(st…

Educational Codeforces Round 8 B. New Skateboard

题目链接:http://codeforces.com/problemset/problem/628/B 解题思路: 一个数最后两位数能被4整除那么这个数就能被4整除,而且题目还是连续的子序列,这就很简单了实现代码: #include <cstdio> #include <string> #include <iostream> #include <algorithm> #include <vector> #include <queue>…

Codefroces 628B New Skateboard(数位+思维)

题目链接:http://codeforces.com/contest/628/problem/B 题目大意:给你一段数字串s(1?≤?|s|?≤?3·10^5),求该字符串有多少子串是4的倍数.解题思路:很容易可以想到,如果一个两位数可以被4整除,那么在它左边加任何数字都能被4整除,如24能被4整除,那么124,1324也可以.因为第3位就是百位,只要是100的倍数肯定也是4的倍数.所以只用考虑前两位即可. 代码: #include<bits/stdc++.h> #define lc(a) (…

CF628B New Skateboard 题解

Content 有一个长度为 \(n\) 的数字串 \(s\),求出有多少个子串能够被 \(4\) 整除. 数据范围:\(1\leqslant n\leqslant 3\times 10^5\). Solution 众所周知,如果最后两位数能够被 \(4\) 整除,这个数也能够被 \(4\) 整除,所以我们只需要看最能被 \(4\) 整除的长度为 \(1\) 或者 \(2\) 的子串有多少个就好. 设能被 \(4\) 整除的长度为 \(1\) 的子串的个数是 \(n_1\),能被 \(4\) 整…

HTML 语义化之b_i_em_strong

默认效果 i和em都是斜体.b和strong都是加粗. 语义区别: em 和 strong 分别表示句中强调和全局加重强调搜索引擎中更受重视,一些语音阅读器也会根据它在阅读时加强语气. i 和 b 是斜体和粗休的表现元素,只对视觉上进行了强调,没有语义上的帮助 i标签 W3C: 语义化的 <i>元素可以用来表示:外文单词.生物分类.科技术语.船名.剧本舞台方位.乐谱.三个代表思想或手写文字.建议通过class特性标识具体语义,若为表示外文单词则采用lang特性标识具体的语言种类. 示例:…

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bootstrap-material-design-个人总结: 所需框架:1.boostrapt 3.0+2.jQuery 1.9.1+ 项目目录:Material/├── css/│ ├── bootstrap-material-design.css│ ├── bootstrap-material-design.css.map│ ├── bootstrap-material-design.min.css│ ├── bootstrap-material-design.min.css.map│ ├…

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New Skateboard

Codeforces 682B New Skateboard（DP）

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