POJ 2305：Basic remains 进制转换

Basic remains

Time Limit: 1000MS		Memory Limit: 65536K
Total Submissions: 5221		Accepted: 2203

Description

Given a base b and two non-negative base b integers p and m, compute p mod m and print the result as a base b integer. p mod m is defined as the smallest non-negative integer k such that p = a*m + k for some integer a.

Input

Input consists of a number of cases. Each case is represented by a line containing three unsigned integers. The first, b, is a decimal number between 2 and 10. The second, p, contains up to 1000 digits between 0 and b-1. The third, m, contains up to 9 digits
between 0 and b-1. The last case is followed by a line containing 0.

Output

For each test case, print a line giving p mod m as a base-b integer.

Sample Input

2 1100 101
10 123456789123456789123456789 1000
0

Sample Output

10
789

给出一个base进制的数，base的范围好在在2到10之间。然后给出在base进制下的p与m，求在base进制下的p%m。

来回的进制转换。

代码：

#include <iostream>
#include <algorithm>
#include <cmath>
#include <vector>
#include <string>
#include <cstring>
#pragma warning(disable:4996)
using namespace std;

int base;
string num;
string m;

int change(string n)
{
	int i;
	int sum = 0;
	int len = n.length();

	for (i = 0; i < len; i++)
	{
		sum = sum*base + n[i] - '0';
	}
	return sum;
}

void res(int mod)
{
	int i, n, a[500];
	int len = num.length();
	int res = 0;

	for (i = 0; i < len; i++)
	{
		res = (res*base + num[i] - '0') % mod;
	}
	//转换成base进制
	n = 0;
	if (res != 0)
	{
		while (res != 0)
		{
			a[n++] = res % base;
			res = res / base;
		}
		for (i = n - 1; i >= 0; i--)
		{
			printf("%d", a[i]);
		}
	}
	else
	{
		printf("0");
	}
	printf("\n");
}

int main()
{
	//freopen("i.txt", "r", stdin);
	//freopen("o.txt", "w", stdout);

	int mod;
	while (cin >> base)
	{
		if (base == 0)
			break;
		cin >> num >> m;
		mod = change(m);

		res(mod);
	}
	//system("pause");
	return 0;
}

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