百练poj2972 确定进制

#include <iostream>
#include <math.h>
#include <stdlib.h>
#include <string>
#include <assert.h>
#include <algorithm>
using namespace std;

long b2ten(char *x, int base)
{
int ret = 0;
int len = strlen(x);
for(int i = 0; i < len; i++)
{
if(x[i] - '0' >= base)
return -1;
ret *= base;
ret += x[i] - '0';
}
return (long)ret;
}

int main()
{
int n;
char p[8], q[8], r[8];
long pAlgorithm, qAlgorithm, rAlgorithm;
scanf("%d", &n);
while(n--)
{
scanf("%s%s%s", p, q, r);
int b;
for(b = 2; b <= 16; b++)
{
pAlgorithm = b2ten(p, b);
qAlgorithm = b2ten(q, b);
rAlgorithm = b2ten(r, b);
if(pAlgorithm == -1 || qAlgorithm == -1 || rAlgorithm == -1)
continue;
if(pAlgorithm * qAlgorithm == rAlgorithm)
{
printf("%d/n", b);
break;
}
}
if(b == 17)
printf("0/n");
}
}