Biorhythms Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 103539   Accepted: 32012 Description Some people believe that there are three cycles in a person's life that start the day he or she is born. These three cycles are the physical,…

http://acm.hdu.edu.cn/showproblem.php?pid=1573 X问题 Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 4439    Accepted Submission(s): 1435 Problem Description 求在小于等于N的正整数中有多少个X满足:X mod a[0] = b[0],…

分析: 因为满足任意一组pi和ai,即可使一个“幸运数”被“污染”,我们可以想到通过容斥来处理这个问题.当我们选定了一系列pi和ai后,题意转化为求[x,y]中被7整除余0,且被这一系列pi除余ai的数的个数,可以看成若干个同余方程联立成的一次同余方程组.然后我们就可以很自然而然的想到了中国剩余定理.需要注意的是,在处理中国剩余定理的过程中,可能会发生超出LongLong的情况,需要写个类似于快速幂的快速乘法来处理. 吐槽:赛场上不会快速乘,导致疯狂WA,唉,还是太年轻 代码: #include…

X问题 Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3921    Accepted Submission(s): 1253 Problem Description 求在小于等于N的正整数中有多少个X满足:X mod a[0] = b[0], X mod a[1] = b[1], X mod a[2] = b[2], …, X mod…

Hello Kiki Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 247 Accepted Submission(s): 107   Problem Description One day I was shopping in the supermarket. There was a cashier counting coins serio…

http://poj.org/problem?id=2891 Strange Way to Express Integers Time Limit: 1000MS   Memory Limit: 131072K Total Submissions: 11970   Accepted: 3788 Description Elina is reading a book written by Rujia Liu, which introduces a strange way to express no…

Strange Way to Express Integers Time Limit:1000MS Memory Limit:131072KB 64bit IO Format:%I64d & %I64u Submit Status Practice POJ 2891   Description Elina is reading a book written by Rujia Liu, which introduces a strange way to express non-negative i…

http://poj.org/problem?id=1006 #include <iostream> #include <cstdio> #include <queue> #include <algorithm> #include <cmath> #include <cstring> #define inf 2147483647 #define N 1000010 #define p(a) putchar(a) #define For…

Lucky7 Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Problem Description When ?? was born, seven crows flew in and stopped beside him. In its childhood, ?? had been unfortunately fall into the sea. While it was d…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5768 给你n个同余方程组,然后给你l,r,问你l,r中有多少数%7=0且%ai != bi. 比较明显的中国剩余定理+容斥,容斥的时候每次要加上个(%7=0)这一组. 中间会爆longlong,所以在其中加上个快速乘法(类似快速幂).因为普通的a*b是直接a个b相加,很可能会爆.但是你可以将b拆分为二进制来加a,这样又快又可以防爆. //#pragma comment(linker, "/STACK…