杭电OJ1212-Big Number
2016-07-30 15:15
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Big Number
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.
To make the problem easier, I promise that B will be smaller than 100000.
Is it too hard? No, I work it out in 10 minutes, and my program contains less than 25 lines.
Input
The input contains several test cases. Each test case consists of two positive integers A and B. The length of A will not exceed 1000, and B will be smaller than 100000. Process to the end of file.
Output
For each test case, you have to ouput the result of A mod B.
Sample Input
2 3
12 7
152455856554521 3250
Sample Output
2
5
1521
Author
Ignatius.L
Source
杭电ACM省赛集训队选拔赛之热身赛
Recommend
Eddy
在做题之前,先了解这样一些结论:
A*B % C = (A%C * B%C)%C
(A+B)%C = (A%C + B%C)%C
如 532 mod 7 =(500%7+30%7+2%7)%7;
当然还有a*b mod c=(a mod c+b mod c)mod c;
如35 mod 3=((5%3)*(7%3))%3
有了这一些结论,题目就好做了!
代码如下:
#include<iostream> #include<string.h> using namespace std; const int MAX=100010; int main() { char str[MAX]; int s,len,sum; while(scanf("%s%d",str,&s)!=EOF) { len=strlen(str); sum=0; for(int i=0;i<len;i++) sum=(sum*10+(str[i]-'0')%s)%s; cout<<sum<<endl; } return 0; }
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