1+ # Description:
2+ # Implement a Python function that checks the order of the elements in a list. The function should return:
3+ 4+ # 1 if the list is strictly increasing,
5+ # -1 if the list is strictly decreasing,
6+ # 0 if the list is constant or contains mixed order elements.
7+ 8+ def check_list_order (lst ):
9+ if not lst or len (lst ) < 2 :
10+ return 0
11+ 12+ is_increasing = True
13+ is_decreasing = True
14+ 15+ for i in range (1 , len (lst )):
16+ if lst [i ] < lst [i - 1 ]:
17+ is_increasing = False
18+ elif lst [i ] > lst [i - 1 ]:
19+ is_decreasing = False
20+ else :
21+ is_increasing = False
22+ is_decreasing = False
23+ 24+ if is_increasing :
25+ return 1
26+ elif is_decreasing :
27+ return - 1
28+ else :
29+ return 0
30+ 31+ 32+ def check_list_order_with_sorted (lst ):
33+ if not lst or len (lst ) < 2 :
34+ return 0
35+ 36+ sorted_asc = sorted (lst )
37+ sorted_desc = sorted (lst , reverse = True )
38+ 39+ if lst == sorted_asc and len (set (lst )) == len (lst ):
40+ return 1
41+ elif lst == sorted_desc and len (set (lst )) == len (lst ):
42+ return - 1
43+ else :
44+ return 0
45+ 46+ 47+ def test_lists ():
48+ assert check_list_order ([1 , 2 , 3 , 4 ]) == 1 , "Expected 1 for strictly increasing list [1, 2, 3, 4]"
49+ assert check_list_order ([4 , 3 , 2 , 1 ]) == - 1 , "Expected -1 for strictly decreasing list [4, 3, 2, 1]"
50+ assert check_list_order ([1 , 1 , 1 , 1 ]) == 0 , "Expected 0 for constant list [1, 1, 1, 1]"
51+ assert check_list_order ([1 , 3 , 2 , 4 ]) == 0 , "Expected 0 for mixed order list [1, 3, 2, 4]"
52+ assert check_list_order ([]) == 0 , "Expected 0 for empty list []"
53+ assert check_list_order ([5 ]) == 0 , "Expected 0 for single element list [5]"
54+ 55+ assert check_list_order_with_sorted ([1 , 2 , 3 , 4 ]) == 1 , "Expected 1 for strictly increasing list [1, 2, 3, 4]"
56+ assert check_list_order_with_sorted ([4 , 3 , 2 , 1 ]) == - 1 , "Expected -1 for strictly decreasing list [4, 3, 2, 1]"
57+ assert check_list_order_with_sorted ([1 , 1 , 1 , 1 ]) == 0 , "Expected 0 for constant list [1, 1, 1, 1]"
58+ assert check_list_order_with_sorted ([1 , 3 , 2 , 4 ]) == 0 , "Expected 0 for mixed order list [1, 3, 2, 4]"
59+ assert check_list_order_with_sorted ([]) == 0 , "Expected 0 for empty list []"
60+ assert check_list_order_with_sorted ([5 ]) == 0 , "Expected 0 for single element list [5]"
0 commit comments