One of the simple problem I have found in the archive. When you have try to solve this problem, careful about the following two things:

1)      You have to print the difference of two army. So you always subtract the small number from the height number. The result must be an integer. 

2)      �The input numbers are not greater than 2^32.� It means the maximum input can be 2^32. The unsigned integer or unsigned long can work with 2^32 �1 range. So you need to use long long or double not unsigned int or unsigned long.