B. The Eternal Immortality time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Even if the world is full of counterfeits, I still regard it as wonderful. Pile up herbs and incense, and arise ag…

题意:已知a,b,求的最后一位. 分析: 1.若b-a>=5,则尾数一定为0,因为连续5个数的尾数要么同时包括一个5和一个偶数,要么包括一个0. 2.若b-a<5,直接暴力求即可. #include<cstdio> #include<cstring> #include<cstdlib> #include<cctype> #include<cmath> #include<iostream> #include<sstre…

B. The Eternal Immortality 题目链接http://codeforces.com/contest/869/problem/B 解题心得:题意就是给出a,b,问(a!)/(b!)的个位数,要注意0,5两个数,只要a,b相差超过5个位数就只能是0,其实没有看到相差5看到相差10也可以的,然后又暴力跑一个末位数就可以了. /*这里跑的是相差10位*/ #include<bits/stdc++.h> using namespace std; typedef long long…

[链接] 链接 [题意] 求b!/a!的最后一位数字 [题解] b-a>=20的话 a+1..b之间肯定有因子2和因子5 答案一定是0 否则暴力就好 [错的次数] 在这里输入错的次数 [反思] 暴力很大,但是差值很小就确定了. 可以作为一个trick [代码] #include <bits/stdc++.h> #define ll long long using namespace std; ll a,b; int main() { //freopen("F:\\rush.tx…

Hidden Code 题目连接: http://codeforces.com/gym/100015/attachments Description It's time to put your hacking skills to the test! You've been called upon to help crack enemy codes in the current war on... something or another. Anyway, the point is that yo…

A. ArielTime Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100685/problem/A Description King Triton really likes watching sport competitions on TV. But much more Triton likes watching live competitions. So Triton decides to set up…

G. #TheDress Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100637/problem/G Description After landing on planet i1c5l people noticed that blue and black clothes are quite popular among the locals. Each aboriginal has at least…

Couple Cover Time Limit: 3000MS   Memory Limit: 524288KB   64bit IO Format: %I64d & %I64u Description 方宝宝有n个篮球,每个篮球上写有一个值ai.他第一次从n个篮球中取出1个,不放回.第二次再在剩余的篮球中取出一个. (每个球被取概率相同).如果这两个球上的值的乘积大于等于p,他会变得高兴,然后请大家吃饭.否则方宝宝会不高兴, 然后暴食暴饮变得更胖. 当然为了方宝宝的健康(被请吃饭),我想取一个…

D. Jerry's Protest time limit per test:2 seconds memory limit per test:256 megabytes input:standard input output:standard output Andrew and Jerry are playing a game with Harry as the scorekeeper. The game consists of three rounds. In each round, Andr…

题目链接: http://codeforces.com/contest/651/problem/D D. Image Preview time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Vasya's telephone contains n photos. Photo number 1 is currently opened on…