hdoj GCC 3123 (大数阶乘取余&转换)
2015-12-05 00:11
197 查看
GCC
Time Limit: 1000/1000 MS (Java/Others) Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 4463 Accepted Submission(s): 1470
[align=left]Problem Description[/align]
The GNU Compiler Collection (usually shortened to GCC) is a compiler system produced by the GNU Project supporting various programming languages. But it doesn’t contains the math operator “!”.
In mathematics the symbol represents the factorial operation. The expression n! means "the product of the integers from 1 to n". For example, 4! (read four factorial) is 4 × 3 × 2 × 1 = 24. (0! is defined as 1, which is a neutral element in multiplication,
not multiplied by anything.)
We want you to help us with this formation: (0! + 1! + 2! + 3! + 4! + ... + n!)%m
[align=left]Input[/align]
The first line consists of an integer T, indicating the number of test cases.
Each test on a single consists of two integer n and m.
[align=left]Output[/align]
Output the answer of (0! + 1! + 2! + 3! + 4! + ... + n!)%m.
Constrains
0 < T <= 20
0 <= n < 10^100 (without leading zero)
0 < m < 1000000
[align=left]Sample Input[/align]
1
10 861017
[align=left]Sample Output[/align]
593846
//由题意可知:当n>m时,从m-n这一区域对m取余都得0,所以不用计算。这样就简化了很多。此题有个坑点就是0!=1;这个必须得注意。
#include<stdio.h> #include<string.h> #include<math.h> #include<algorithm> #define ll long long #define N 1000010 using namespace std; char s[110]; ll sum ; ll change(char *s) { int l,i,ans=0; l=strlen(s); for(i=0;i<l;i++) ans=ans*10+(s[i]-'0'); return ans; } int main() { int t; int n,m; int i,j,k,l; scanf("%d",&t); while(t--) { scanf("%s%d",s,&m); l=strlen(s); if(l<7) { n=change(s); if(n>m) n=m-1; sum[0]=1; int ans=0; for(i=1;i<=n;i++) { sum[i]=(sum[i-1]*i)%m; ans=(ans+sum[i])%m; } printf("%d\n",(ans+1)%m); } else { n=m-1; sum[0]=1; int ans=0; for(i=1;i<=n;i++) { sum[i]=(sum[i-1]*i)%m; ans=(ans+sum[i])%m; } printf("%d\n",(ans+1)%m); } } return 0; }
相关文章推荐
- HDOJ 5443 The Water Problem 【RMQ 模板题】
- 1.2Centos6.5本地yum源配置
- Ubuntu15.04+caffe+cuda7.5+cudnn+matlab
- Android 打包成jar类库 和 doc文档输出
- c语言:将三个数按从大到小输出。
- POJ 3258 River Hopscotch(二分搜索,最大化最小值)
- Android FloatingActionButton: FloatingActionsMenu向下伸展弹出及删除包含的FloatingActionButton【4】
- 你眼中的async/await是什么样的?
- 论解决问题的一般做法 - 以 MapServer 为例
- Linux相关概念
- HDU-1541 Stars(树状数组+逆序数)
- jforum 学习资料
- C# FTP上传下载(支持断点续传)二
- python学习笔记-Day06-Day07(面向对象)
- [转自互联网][怀疑是自动写作]
- valgrind官方手册翻译(一)_20151128
- Java - 面向对象设计六大基本原则-以Volley为例
- GitHub上搭建Hexo个人博客
- HDU-5384Danganronpa(AC自动机模板)
- 分清iOS中的OC和CF概念