return money amount in change .

change.py

change = lambda t, r=[], coins={5,3,2,1}: r if t==0 else change(*(lambda g: (t-g, r+[g]))(t-min(t-i for i in coins-{sum(r)+t} if t-i>=0)))
print(change(999))

#better attempt
change = lambda x,y=[]: y if x<=0  else change(*(lambda series: (x-[i for i in series if x>=i][0], y+[[i for i in series if x>=i][0]]))([200, 100, 50, 20, 10, 5, 1]))


#with roman encode method
solution = lambda x,y="": y if x<=0  else solution(*(lambda series: (x-[i for i in series if x>=i][0], y+{1000:"M", 500:"D", 100:"C", 50:"L", 10:"X", 5:"V", 1:"I"}[[i for i in series if x>=i][0]]))([1000, 500, 100, 50, 10, 5, 1]))