comparision sort👑 

s = [ 1 ,5 ,8 ,0 ]
res = []
def dfs(idx  ,cur) :
    if idx == len(s) :
        if cur :
            res.append(cur)
        return
    dfs(idx + 1 , cur + [s[idx]])
    dfs(idx + 1 , cur )
dfs(0 , [])
print(sorted(res , key = lambda x : (len(x) , x))) # x belongs to jagged - array