#include "stdio.h"
#include "string.h"
#include "string"
#include "iostream"
#include "math.h"
#include "map"
using namespace std;
map<char,string> mp;
map<char,string>::iterator it;
int main(int argc, char const *argv[])
{
mp['0']="0000";mp['1']="0001";mp['2']="0010";
mp['3']="0011";mp['4']="0100";mp['5']="0101";
mp['6']="0110";mp['7']="0111";mp['8']="1000";
mp['9']="1001";mp['A']="1010";mp['B']="1011";
mp['C']="1100";mp['D']="1101";mp['E']="1110";
mp['F']="1111";
for(it = mp.begin(); it != mp.end(); it++)
cout<<it->first<<":"<<it->second<<endl;
//it->first下标的值,it->second所在下标的值
return 0;
}