HUD 2031: hexadecimal conversion

Hexadecimal conversion Time Limit: 2000/1000 MS (Java/others) memory limit: 65536/32768 K (Java/Others)
Total submission (s): 23830 accepted submission (s): 13344


Problem description input a decimal number N and convert it to the r hexadecimal number output.
Input data contains multiple test instances. Each test instance contains two integers, n (32-bit integer) and R (2 <= r <= 16, r <> 10 ).
 
Output is the number of converted outputs for each test instance. Each output occupies one row. If the R value is greater than 10, the corresponding digital rule is in hexadecimal notation (for example, 10 is represented by a, and so on ).
Sample Input

7 223 12-4 3

 
Sample output

1111B-11

Question ..

#include<cstdio>#include<cstring>#include<algorithm>#include<iostream>using namespace std;int main(){    int n, m, s, i;    char c, a[1000];    while(scanf("%d%d",&n,&m)!=EOF)    {        i=0;        if(n<0)            printf("-");        while(n)        {            s=abs(n%m);            if(s>=0 && s<=9 || s<0 && s>=-9)            a[i]='0'+s;            if(s>9)            {                c='A'+s-10;                a[i]=c;            }            n=n/m;            i++;        }        for(int j=i-1; j>=0; j--)            printf("%c", a[j]);        printf("\n");    }    return 0;}