1027. Colors in Mars (20) @ PAT (Advanced Level) Practise

#include<stdio.h>
#include<vector>
using namespace std;

vector<char> transfer(int i)
{
int tmp;
vector<char> result;
while(i>12)
{
tmp=i%13;
result.push_back(tmp>9?('A'+tmp-10):('0'+tmp));
i/=13;
}
result.push_back(i>9?('A'+i-10):('0'+i));
return result;
}
int main()
{
int a[3];
scanf("%d %d %d",a,a+1,a+2);
printf("#");
vector<char> v;
for(int i=0;i<3;i++)
{
v=transfer(a[i]);
if(v.size()==1)
{
printf("0%c",v[0]);
}
else
{
printf("%c%c",v[1],v[0]);
}
}

return 0;
}