题目:http://codeforces.com/problemset/problem/597/A Divisibility time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Find the number of k-divisible numbers on the segment [a, b]. In other words y…

水题. #include<iostream> #include<cstring> #include<cmath> #include<queue> #include<algorithm> #include<cstdio> using namespace std; long long k,L,R; int main() { scanf("%lld%lld%lld",&k,&L,&R); long…

 Divisibility by Eight time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given a non-negative integer n, its decimal representation consists of at most 100 digits and doesn't contain…

J. Divisibility time limit per test 0.5 seconds memory limit per test 64 megabytes input standard input output standard output IT City company developing computer games invented a new way to reward its employees. After a new game release users start…

Divisibility 我们考虑删数字 首先我们可以发现有一类数很特殊就是大于 n / 2的素数, 因为这些素数的贡献只有1, 并且在n大的时候, 这些素数的个数不是很少, 我们可以最后用这些数去调整, 并且删掉一个数的时候删掉的是它的因子个数, 所以可以用素数去控制最后的数量.当n小的时候直接状压枚举. #include<bits/stdc++.h> #define LL long long #define fi first #define se second #define mk mak…

题目链接  Divisibility 题意 给定$n$和$k$,构造一个集合$\left\{1, 2, 3, ..., n \right\}$的子集,使得在这个集合中恰好有$k$对正整数$(x, y)$, $x < y$ 满足$x$是$y$的约数. 选定$1$和$2$, 首先把满足 $x > [\frac{n}{2}]\ $的质数$x$留出来, 然后把满足 $ [\frac{n}{3}]\  < x <=  [\frac{n}{2}]\ $的质数,以及他们的两倍留出来,   留出来…

解题思路: 只有尾数为25,50,75,00的数才可能是25的倍数. 对字符串做4次处理,以25为例. a. 将字符串中的最后一个5移到最后一位.计算交换次数.(如果没有找到5,则不可能凑出25,考虑50.75.00) b. 字符串已经改变,将此时最后一个2移到倒数第二位.计算交换次数. (如果没有找到2,则也不可能凑出25,考虑50.75.00) c. 将除了最后两位之外的第一个非0的数字移到首位,计算交换次数.(如果找不到除了最后两位之外的非0数字,则不可能凑出25,考虑50.75.00)…

A - Wilbur and Swimming Pool Time Limit:1000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Practice CodeForces 596A Description After making bad dives into swimming pools, Wilbur wants to build a swimming pool in the sha…

 DivisibilityCrawling in process... Crawling failed Time Limit:1000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Practice CodeForces 597A Description Find the number of k-divisible numbers on the segment [a, b]. In ot…

C. Divisibility by Eight Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/550/problem/C Description You are given a non-negative integer n, its decimal representation consists of at most 100 digits and doesn't contain leadin…