CSES - Aalto Competitive Programming 2024 - wk6 - Homework - Results
Submission details
Task:Course Schedule
Sender:esya_rae
Submission time:2024-10-09 14:47:58 +0300
Language:Python3 (PyPy3)
Status:READY
Result:ACCEPTED
Test results
testverdicttime
#1ACCEPTED0.04 sdetails
#2ACCEPTED0.04 sdetails
#3ACCEPTED0.04 sdetails
#4ACCEPTED0.04 sdetails
#5ACCEPTED0.04 sdetails
#6ACCEPTED0.56 sdetails
#7ACCEPTED0.53 sdetails
#8ACCEPTED0.53 sdetails
#9ACCEPTED0.54 sdetails
#10ACCEPTED0.49 sdetails
#11ACCEPTED0.35 sdetails
#12ACCEPTED0.04 sdetails
#13ACCEPTED0.04 sdetails
#14ACCEPTED0.49 sdetails
#15ACCEPTED0.27 sdetails
#16ACCEPTED0.04 sdetails
#17ACCEPTED0.26 sdetails

Code

import sys
def topological_sort_dfs(v):
    global result, G, visited, in_use, cyclic
    visited[v] = True
    in_use[v] = True

    for w in G[v]:
        if not visited[w]:
            topological_sort_dfs(w)
        elif in_use[w]:
            cyclic = True
            return

    result.append(v)
    in_use[v] = False


n, m = map(int, input().split())
sys.setrecursionlimit(n + 10)
result = []
visited = [False] * n
in_use = [False] * n
G = [[] for _ in range(n)]
cyclic = False
for _ in range(m):
    a, b = map(int, input().split())
    G[a - 1].append(b - 1)

for v in range(n):
    if not visited[v]:
        topological_sort_dfs(v)
    if cyclic:
        break

if cyclic:
    print('IMPOSSIBLE')
else:
    result.reverse()
    for i in range(n):
        result[i] = result[i] + 1
    print(*result)

Test details

Test 1

Verdict: ACCEPTED

input
10 20
5 2
2 4
8 9
6 4
...

correct output
5 7 10 2 1 8 3 9 6 4 

user output
10 7 5 2 1 8 3 9 6 4

Test 2

Verdict: ACCEPTED

input
10 20
2 7
1 10
9 5
9 7
...

correct output
1 8 3 6 10 2 9 4 5 7 

user output
8 1 3 6 10 2 9 4 5 7

Test 3

Verdict: ACCEPTED

input
10 20
8 5
2 3
10 1
9 1
...

correct output
4 6 7 9 10 2 8 3 1 5 

user output
9 7 10 6 8 4 2 3 1 5

Test 4

Verdict: ACCEPTED

input
10 20
5 10
10 3
9 10
6 2
...

correct output
7 8 6 4 2 1 5 9 10 3 

user output
8 7 6 4 2 5 1 9 10 3

Test 5

Verdict: ACCEPTED

input
10 20
2 9
4 8
9 1
10 6
...

correct output
IMPOSSIBLE

user output
IMPOSSIBLE

Test 6

Verdict: ACCEPTED

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

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

user output
99998 99996 99994 99993 99992 ...
Truncated

Test 7

Verdict: ACCEPTED

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

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

user output
100000 99994 99991 99986 99983...
Truncated

Test 8

Verdict: ACCEPTED

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

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

user output
100000 99998 99996 99993 99992...
Truncated

Test 9

Verdict: ACCEPTED

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

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

user output
99996 99992 99991 99986 99985 ...
Truncated

Test 10

Verdict: ACCEPTED

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

correct output
IMPOSSIBLE

user output
IMPOSSIBLE

Test 11

Verdict: ACCEPTED

input
100000 199998
1 100000
1 100000
2 100000
2 100000
...

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

user output
99999 99998 99997 99996 99995 ...
Truncated

Test 12

Verdict: ACCEPTED

input
2 2
1 2
2 1

correct output
IMPOSSIBLE

user output
IMPOSSIBLE

Test 13

Verdict: ACCEPTED

input
6 6
1 2
2 3
4 3
4 5
...

correct output
IMPOSSIBLE

user output
IMPOSSIBLE

Test 14

Verdict: ACCEPTED

input
99999 149997
1 3
3 5
5 7
7 9
...

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

user output
1 2 3 4 5 6 7 8 9 10 11 12 13 ...
Truncated

Test 15

Verdict: ACCEPTED

input
100000 149998
2 1
3 2
4 3
5 4
...

correct output
100000 99999 99998 99997 99996...

user output
100000 99999 99998 99997 99996...
Truncated

Test 16

Verdict: ACCEPTED

input
6 6
1 2
1 3
2 4
3 5
...

correct output
IMPOSSIBLE

user output
IMPOSSIBLE

Test 17

Verdict: ACCEPTED

input
100000 200000
1 1
1 1
2 2
2 2
...

correct output
IMPOSSIBLE

user output
IMPOSSIBLE