S001-AC.cc
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#include <iostream>
#include <string>
using namespace std;
void dec2negbin(int a)
{
char rem;
string str;
do
{
if((rem = a % -2) == -1)
{
rem = 1;
a = (a/-2) + 1;
}
else
{
a /= -2;
}
str.insert(0,1,rem + 48);
}while(a);
cout << str << endl;
}
int main()
{
while(1)
{
int a;
cin >> a;
if(cin.eof())
{
return 0;
}
cout << a << ": ";
dec2negbin(a);
}
return 0;
}