CSES - Aalto Competitive Programming 2026 - wk6 - Homework

Submission details
Task:	Course Schedule
Sender:	aalto26fh_005
Submission time:	2026-10-06 18:41:55 +0300
Language:	Python3 (PyPy3)
Status:	READY
Result:	WRONG ANSWER

Test results
test	verdict	time
#1	WRONG ANSWER	0.04 s	details
#2	WRONG ANSWER	0.04 s	details
#3	WRONG ANSWER	0.04 s	details
#4	WRONG ANSWER	0.04 s	details
#5	WRONG ANSWER	0.04 s	details
#6	WRONG ANSWER	0.04 s	details
#7	WRONG ANSWER	0.04 s	details
#8	WRONG ANSWER	0.04 s	details
#9	WRONG ANSWER	0.04 s	details
#10	WRONG ANSWER	0.04 s	details
#11	WRONG ANSWER	0.04 s	details
#12	WRONG ANSWER	0.04 s	details
#13	WRONG ANSWER	0.04 s	details
#14	WRONG ANSWER	0.04 s	details
#15	WRONG ANSWER	0.04 s	details
#16	WRONG ANSWER	0.04 s	details
#17	WRONG ANSWER	0.04 s	details

Code

from collections import deque, defaultdict

def order(n, req):
  adj = defaultdict(list)
  in_deg = [0] * (n + 1)

  for a, b in req:
    adj[a].append(b)
    in_deg[b] += 1

  queue = deque()
  for i in range(1, n + 1):
    if in_deg[i] == 0:
      queue.append(i)

  order = []
  while queue:
    curr = queue.popleft()
    order.append(curr)

    for adjacent in adj[curr]:
      in_deg[adjacent] -= 1
      if in_deg[adjacent] == 0:
        queue.append(adjacent)

  if len(order) == n:
    return " ".join(map(str, order))
  else:
    return "IMPOSSIBLE"

Test details

Test 1

Verdict: WRONG ANSWER

input
`10 20 5 2 2 4 8 9 6 4 ...` view save

correct output
`5 7 10 2 1 8 3 9 6 4` view save

user output
(empty)

Test 2

Verdict: WRONG ANSWER

input
`10 20 2 7 1 10 9 5 9 7 ...` view save

correct output
`1 8 3 6 10 2 9 4 5 7` view save

user output
(empty)

Test 3

Verdict: WRONG ANSWER

input
`10 20 8 5 2 3 10 1 9 1 ...` view save

correct output
`4 6 7 9 10 2 8 3 1 5` view save

user output
(empty)

Test 4

Verdict: WRONG ANSWER

input
`10 20 5 10 10 3 9 10 6 2 ...` view save

correct output
`7 8 6 4 2 1 5 9 10 3` view save

user output
(empty)

Test 5

Verdict: WRONG ANSWER

input
`10 20 2 9 4 8 9 1 10 6 ...` view save

correct output
`IMPOSSIBLE` view save

user output
(empty)

Test 6

Verdict: WRONG ANSWER

input
`100000 200000 78359 8853 18190 30703 11401 30087 34627 11535 ...` view save

correct output
`2 3 8 9 16 18 21 22 27 34 36 4...` view save

user output
(empty)

Test 7

Verdict: WRONG ANSWER

input
`100000 200000 32395 2098 67067 31866 31867 67167 78488 33397 ...` view save

correct output
`9 11 13 16 22 35 37 38 40 44 5...` view save

user output
(empty)

Test 8

Verdict: WRONG ANSWER

input
`100000 200000 19035 36947 13730 46121 99449 77790 15626 11731 ...` view save

correct output
`1 7 15 17 18 34 38 41 48 49 51...` view save

user output
(empty)

Test 9

Verdict: WRONG ANSWER

input
`100000 200000 14188 9709 46541 20871 32203 88809 99879 54779 ...` view save

correct output
`6 10 11 16 17 19 21 22 23 28 3...` view save

user output
(empty)

Test 10

Verdict: WRONG ANSWER

input
`100000 200000 41882 61162 28138 18053 74649 74863 69760 74508 ...` view save

correct output
`IMPOSSIBLE` view save

user output
(empty)

Test 11

Verdict: WRONG ANSWER

input
`100000 199998 1 100000 1 100000 2 100000 2 100000 ...` view save

correct output
`1 2 3 4 5 6 7 8 9 10 11 12 13 ...` view save

user output
(empty)

Test 12

Verdict: WRONG ANSWER

input
`2 2 1 2 2 1` view save

correct output
`IMPOSSIBLE` view save

user output
(empty)

Test 13

Verdict: WRONG ANSWER

input
`6 6 1 2 2 3 4 3 4 5 ...` view save

correct output
`IMPOSSIBLE` view save

user output
(empty)

Test 14

Verdict: WRONG ANSWER

input
`99999 149997 1 3 3 5 5 7 7 9 ...` view save

correct output
`1 2 3 4 5 6 7 8 9 10 11 12 13 ...` view save

user output
(empty)

Test 15

Verdict: WRONG ANSWER

input
`100000 149998 2 1 3 2 4 3 5 4 ...` view save

correct output
`100000 99999 99998 99997 99996...` view save

user output
(empty)

Test 16

Verdict: WRONG ANSWER

input
`6 6 1 2 1 3 2 4 3 5 ...` view save

correct output
`IMPOSSIBLE` view save

user output
(empty)

Test 17

Verdict: WRONG ANSWER

input
`100000 200000 1 1 1 1 2 2 2 2 ...` view save

correct output
`IMPOSSIBLE` view save

user output
(empty)

Aalto Competitive Programming 2026 - wk6 - Homework

Course Schedule

Code

Test details

Test 1

Test 2

Test 3

Test 4

Test 5

Test 6

Test 7

Test 8

Test 9

Test 10

Test 11

Test 12

Test 13

Test 14

Test 15

Test 16

Test 17

Tasks

Submissions (aalto26fh_005)