HDU 1212 Big number (large numbers modulo)

Source: Internet
Author: User

Title Link: http://acm.hdu.edu.cn/showproblem.php?pid=1212

Big numberTime limit:2000/1000 MS (java/others) Memory limit:65536/32768 K (java/others) Total Submission (s): 7083 Accepted Submission (s): 4884

Problem Descriptionas We know, Big number is always troublesome. But it's really important in our ACM. And today, your task is to write a program to calculate a mod B.

The problem easier, I promise that B'll be smaller than 100000.

Is it too hard? No, I work it out in the minutes, and my program contains less than lines.

Inputthe input contains several test cases. Each test case consists of positive integers A and B. The length of A would not exceed, and B would be smaller than 100000. Process to the end of file.

Outputfor Each test case, you have to ouput the result of A mod B.

Sample Input
2 312 7152455856554521 3250

Sample Output
251521

Authorignatius.l
SOURCE Hangzhou Electric ACM Provincial Training Team Qualifying matchThe main topic: give you a length of not more than 1000 of the large number A, there is a not more than 100000 B, quickly seek a% B.
Problem-solving ideas: the first kind: according to the normal division of the method of a person except down.
the second type:
As an example, 1314 7 = 5
By Qin Jiushao formula:
1314= ((1*10+3) *10+1) *10+4
So there are
1314% 7 = (((1 * 10 7 +3) *10% 7 + 1) *10% 7 +4)%7

See the code.

#include <iostream> #include <cstdio> #include <cstring>using namespace Std;char a[100000+10];int Main () {    int b;    while (~SCANF ("%s%d", a,&b))    {        int len=strlen (a);        int Pre=0,ans;        for (int i=0; i<len; i++)        {            ans=pre*10+a[i]-' 0 ';            pre=ans%b;        }        printf ("%d\n", pre);    }    return 0;}


HDU 1212 Big number (large numbers modulo)

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.