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Aalto Competitive Programming 2026 - wk2 - Homework

Connect cities

  • Start: 2026-09-02 18:00:00
  • End: 2026-09-09 16:15:00
Submission details
Task:Connect cities
Sender:aalto26bh_045
Submission time:2026-09-03 17:25:37 +0300
Language:Python3 (PyPy3)
Status:READY
Result:
Test results
testverdicttime
#10.06 sdetails
#20.06 sdetails
#30.06 sdetails
#40.06 sdetails
#50.06 sdetails
#60.06 sdetails
#70.06 sdetails
#80.06 sdetails
#90.06 sdetails
#100.06 sdetails
#110.06 sdetails
#120.06 sdetails

Code

x = input()
n = x.split(" ")[0]
m = x.split(" ")[1]
n = int(n)
m = int(m)

roads = []
for _ in range(m):
    x = input()
    roads.append([int(x.split(" ")[0]), int(x.split(" ")[1])])

buckets = []

#print(f"Roads: ${roads}")
for idx, road in enumerate(roads):
    a = road[0]
    b = road[1]
    i = 0
    while i < len(buckets):
        bucket = buckets[i]
        if a in bucket:
            j = i + 1
            while j < len(buckets):
                bucket_2 = buckets[j]
                if b in bucket_2:
                    bucket[i] = bucket[i].extend(bucket_2)
                    buckets.remove(bucket_2)
                    break
                j += 1
        elif b in bucket:
            j = i + 1
            while j < len(buckets):
                bucket_2 = buckets[j]
                if a in bucket_2:
                    bucket.extend(bucket_2)
                    buckets.remove(bucket_2)
                    break
                j += 1
        elif idx == len(roads) - 1:
            buckets.append([a, b])

        i += 1
    
    if len(buckets) == 0:
        buckets.append([a, b])


#print(f"Buckets: ${buckets}")

print(len(buckets) - 1)
i = 0
while i < len(buckets) - 2:
    bucket = buckets[i]
    bucket_1 = buckets[i + 1]
    print(f"{bucket[0]} {bucket_1[0]}")
print(f"{buckets[-2][0]} {buckets[-1][0]}")

return

Test details

Test 1

Verdict:

input
10 10
2 5
5 6
1 4
6 8
...
view save

correct output
2
1 2
2 7
view save

user output
(empty)

Error:
File "/box/input/code.py", line 58
    return
SyntaxError: return outside function

Test 2

Verdict:

input
10 10
3 9
6 8
9 10
7 8
...
view save

correct output
2
1 4
4 5
view save

user output
(empty)

Error:
File "/box/input/code.py", line 58
    return
SyntaxError: return outside function

Test 3

Verdict:

input
10 10
7 9
1 7
1 3
3 4
...
view save

correct output
0
view save

user output
(empty)

Error:
File "/box/input/code.py", line 58
    return
SyntaxError: return outside function

Test 4

Verdict:

input
10 10
4 8
5 9
4 9
2 7
...
view save

correct output
1
1 3
view save

user output
(empty)

Error:
File "/box/input/code.py", line 58
    return
SyntaxError: return outside function

Test 5

Verdict:

input
10 10
4 9
2 4
7 10
1 8
...
view save

correct output
0
view save

user output
(empty)

Error:
File "/box/input/code.py", line 58
    return
SyntaxError: return outside function

Test 6

Verdict:

input
100000 200000
7233 22146
94937 96203
6133 10731
98737 99193
...
view save

correct output
4785
1 2
2 3
3 4
4 5
...
view save

user output
(empty)

Error:
File "/box/input/code.py", line 58
    return
SyntaxError: return outside function

Test 7

Verdict:

input
100000 200000
92950 93575
24401 88897
41796 99364
47106 50330
...
view save

correct output
4868
1 2
2 7
7 9
9 15
...
view save

user output
(empty)

Error:
File "/box/input/code.py", line 58
    return
SyntaxError: return outside function

Test 8

Verdict:

input
100000 200000
15637 76736
79169 98809
4382 86557
73383 77029
...
view save

correct output
4683
1 9
9 20
20 27
27 28
...
view save

user output
(empty)

Error:
File "/box/input/code.py", line 58
    return
SyntaxError: return outside function

Test 9

Verdict:

input
100000 200000
47932 66981
86401 99942
4353 27841
60492 67345
...
view save

correct output
4807
1 6
6 7
7 11
11 12
...
view save

user output
(empty)

Error:
File "/box/input/code.py", line 58
    return
SyntaxError: return outside function

Test 10

Verdict:

input
100000 200000
6554 44548
76413 98555
5447 59589
70166 74434
...
view save

correct output
4786
1 2
2 18
18 21
21 27
...
view save

user output
(empty)

Error:
File "/box/input/code.py", line 58
    return
SyntaxError: return outside function

Test 11

Verdict:

input
100000 1
1 2
view save

correct output
99998
1 3
3 4
4 5
5 6
...
view save

user output
(empty)

Error:
File "/box/input/code.py", line 58
    return
SyntaxError: return outside function

Test 12

Verdict:

input
10 9
2 5
5 6
1 4
6 8
...
view save

correct output
2
1 2
2 7
view save

user output
(empty)

Error:
File "/box/input/code.py", line 58
    return
SyntaxError: return outside function

Tasks

A Connect citiesB Apartments

Submissions (aalto26bh_045)

2026-09-04 11:46:43 2026-09-03 19:19:24 2026-09-03 18:43:40 2026-09-03 18:35:37 2026-09-03 18:24:52 2026-09-03 17:26:16 2026-09-03 17:25:37 2026-09-03 17:24:25 2026-09-03 17:23:17