HDU 1212 Big Number 大数取模
发布时间:2021-05-17 18:25:09 所属栏目:大数据 来源:网络整理
导读:Big Number ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Time Limit: 2000/1000 MS (Java/Others)????Memory Limit: 65536/32768 K (Java/Others) ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Total Submis
Big Number? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Time Limit: 2000/1000 MS (Java/Others)????Memory Limit: 65536/32768 K (Java/Others)? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Total Submission(s): 6979????Accepted Submission(s): 4804 Problem Description As 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 ? 点击打开题目链接HDU1212 输入 A 和 B ,输出 A mod B ,A 的长度不超过1000,B 小于100000 先看下面三个公式: (a + b) % n = ((a % n) + (b % n)) % n (a - b) % n = ((a % n) - (b % n) + n) % n ab % n = (a % n)(b % n) % n 注意在减法中,a % n 可能小于 b % n,要在结尾加上 n ,而在乘法中要注意 a % n 和 b % n 相乘是否会溢出。 对于本题,我们把大数写成“自左向右”的形式:1234 = ((1 * 10) + 2) * 10 + 3) * 10 + 4 然后用前面的公式,每步取模,像这样: #include <cstdio> #include <cstring> int main() { char n[1010]; int m; while (~scanf ("%s%d",n,&m)) { int len = strlen(n); int ans = 0; for (int i = 0; i < len; i++) //每步取模 ans = (int)((ans * 10 + n[i] - '0') % m); printf("%dn",ans); } return 0 ; }当然也可以用Java中的大数,十分方便: import java.math.BigInteger; import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); while (scanner.hasNext()) { BigInteger n = scanner.nextBigInteger(); //输入 BigInteger m = scanner.nextBigInteger(); System.out.println(n.mod(m)); //取模 } } } (编辑:淮安站长网) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |