CSES - Aalto Competitive Programming 2026 - wk2 - Wed

Submission details
Task:	Astralis session I
Sender:	aalto26bw_004
Submission time:	2026-09-09 17:07:57 +0300
Language:	Python3 (PyPy3)
Status:	READY
Result:	WRONG ANSWER

Test results
test	verdict	time
#1	ACCEPTED	0.04 s	details
#2	ACCEPTED	0.04 s	details
#3	ACCEPTED	0.04 s	details
#4	ACCEPTED	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	ACCEPTED	0.04 s	details
#9	WRONG ANSWER	0.04 s	details
#10	WRONG ANSWER	0.04 s	details
#11	ACCEPTED	0.04 s	details
#12	WRONG ANSWER	0.04 s	details
#13	ACCEPTED	0.04 s	details
#14	ACCEPTED	0.04 s	details
#15	WRONG ANSWER	0.04 s	details
#16	WRONG ANSWER	0.04 s	details
#17	ACCEPTED	0.04 s	details
#18	WRONG ANSWER	0.04 s	details
#19	WRONG ANSWER	0.04 s	details
#20	ACCEPTED	0.04 s	details
#21	ACCEPTED	0.04 s	details
#22	WRONG ANSWER	0.04 s	details
#23	WRONG ANSWER	0.04 s	details
#24	WRONG ANSWER	0.04 s	details
#25	WRONG ANSWER	0.04 s	details
#26	ACCEPTED	0.04 s	details
#27	ACCEPTED	0.04 s	details
#28	WRONG ANSWER	0.04 s	details
#29	ACCEPTED	0.04 s	details
#30	ACCEPTED	0.04 s	details
#31	WRONG ANSWER	0.04 s	details
#32	RUNTIME ERROR	0.06 s	details
#33	RUNTIME ERROR	0.06 s	details
#34	RUNTIME ERROR	0.06 s	details
#35	RUNTIME ERROR	0.06 s	details
#36	RUNTIME ERROR	0.06 s	details
#37	RUNTIME ERROR	0.06 s	details
#38	RUNTIME ERROR	0.06 s	details
#39	RUNTIME ERROR	0.06 s	details
#40	RUNTIME ERROR	0.06 s	details
#41	RUNTIME ERROR	0.06 s	details
#42	WRONG ANSWER	0.04 s	details
#43	ACCEPTED	0.04 s	details
#44	ACCEPTED	0.04 s	details
#45	ACCEPTED	0.04 s	details
#46	WRONG ANSWER	0.04 s	details
#47	WRONG ANSWER	0.04 s	details
#48	ACCEPTED	0.04 s	details
#49	WRONG ANSWER	0.04 s	details
#50	WRONG ANSWER	0.04 s	details
#51	WRONG ANSWER	0.04 s	details
#52	ACCEPTED	0.04 s	details
#53	WRONG ANSWER	0.05 s	details
#54	WRONG ANSWER	0.04 s	details
#55	WRONG ANSWER	0.05 s	details
#56	WRONG ANSWER	0.04 s	details
#57	WRONG ANSWER	0.04 s	details
#58	WRONG ANSWER	0.04 s	details
#59	WRONG ANSWER	0.04 s	details
#60	WRONG ANSWER	0.04 s	details
#61	ACCEPTED	0.04 s	details

Code

from collections import defaultdict


def main():
    n = list(map(int, input()))

    galaxies = n[0]

    wormholes = galaxies-1
    array = []

    for _ in range(wormholes):
        a, b = map(int, input().split())
        array.append((a, b))


    if galaxies % 2 != 0:
        print("No")
        return

    adjacency_list = {}

    for i in range(1, galaxies+1):
        adjacency_list[i] = []

    for i in range(len(array)):
        a, b = array[i]
        adjacency_list[a].append(b)
        adjacency_list[b].append(a)

    connections = list(adjacency_list.items())

    connections.sort(key= lambda item: len(item[1]), reverse=True)


    uolevi_side = connections[0][1]
    marja_side = connections[1][1]
    return_string = ""

    if len(uolevi_side) != len(marja_side):
        print("No")
        return
    else:
        print("Yes")

    for i in range(len(uolevi_side)):
        return_string = return_string + "U"

    for i in range(len(marja_side)):
        return_string = return_string + "M"

    print(return_string)

    



if __name__ == "__main__":
    main()

Test details

Test 1

Verdict: ACCEPTED

input
`2 1 2` view save

correct output
`Yes MU` view save

user output
`Yes UM` view save

Test 2

Verdict: ACCEPTED

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

correct output
`No` view save

user output
`No` view save

Test 3

Verdict: ACCEPTED

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

correct output
`No` view save

user output
`No` view save

Test 4

Verdict: ACCEPTED

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

correct output
`No` view save

user output
`No` view save

Test 5

Verdict: WRONG ANSWER

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

correct output
`Yes MUMUMU` view save

user output
`Yes UUMM` view save

Test 6

Verdict: WRONG ANSWER

input
`8 1 8 5 8 3 5 3 6 ...` view save

correct output
`Yes MUMUMUUM` view save

user output
`No` view save

Test 7

Verdict: WRONG ANSWER

input
`8 1 4 1 6 3 6 1 5 ...` view save

correct output
`Yes MUUMMUMU` view save

user output
`Yes UUUMMM` view save

Test 8

Verdict: ACCEPTED

input
`8 1 7 1 3 1 8 2 8 ...` view save

correct output
`No` view save

user output
`No` view save

Test 9

Verdict: WRONG ANSWER

input
`8 2 3 3 8 7 8 5 8 ...` view save

correct output
`Yes MMUMUMUU` view save

user output
`Yes UUUMMM` view save

Test 10

Verdict: WRONG ANSWER

input
`10 4 8 4 7 1 7 3 4 ...` view save

correct output
`Yes MUMMMUMUUU` view save

user output
`No` view save

Test 11

Verdict: ACCEPTED

input
`10 3 4 4 5 4 8 4 10 ...` view save

correct output
`No` view save

user output
`No` view save

Test 12

Verdict: WRONG ANSWER

input
`10 1 3 2 3 2 6 6 10 ...` view save

correct output
`Yes MMMUUMUMUU` view save

user output
`No` view save

Test 13

Verdict: ACCEPTED

input
`10 1 10 1 3 6 10 8 10 ...` view save

correct output
`No` view save

user output
`No` view save

Test 14

Verdict: ACCEPTED

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

correct output
`No` view save

user output
`No` view save

Test 15

Verdict: WRONG ANSWER

input
`12 4 10 4 11 9 11 6 11 ...` view save

correct output
`Yes UUUMUMMUMUMM` view save

user output
`No` view save

Test 16

Verdict: WRONG ANSWER

input
`12 1 2 1 8 5 8 3 8 ...` view save

correct output
`Yes MUMMMUUMUUUM` view save

user output
`No` view save

Test 17

Verdict: ACCEPTED

input
`14 9 12 6 9 3 6 3 11 ...` view save

correct output
`No` view save

user output
`No` view save

Test 18

Verdict: WRONG ANSWER

input
`14 13 14 7 13 3 7 7 10 ...` view save

correct output
`Yes UMMMMUMUUMUUMU` view save

user output
`No` view save

Test 19

Verdict: WRONG ANSWER

input
`14 1 3 3 8 3 7 8 9 ...` view save

correct output
`Yes MUUUMMUUUMMMMU` view save

user output
`No` view save

Test 20

Verdict: ACCEPTED

input
`16 4 12 1 4 12 16 11 12 ...` view save

correct output
`No` view save

user output
`No` view save

Test 21

Verdict: ACCEPTED

input
`18 12 13 13 17 8 13 12 15 ...` view save

correct output
`No` view save

user output
`No` view save

Test 22

Verdict: WRONG ANSWER

input
`100 24 28 28 65 28 58 54 65 ...` view save

correct output
`Yes MMUUMUMMUMUMUUMUUMMUUUMMMUUUUM...` view save

user output
`No` view save

Test 23

Verdict: WRONG ANSWER

input
`100 57 98 24 57 24 34 25 34 ...` view save

correct output
`Yes MUUMUMUUUMMUMMUMUMMMMMUUUMUUMM...` view save

user output
`No` view save

Test 24

Verdict: WRONG ANSWER

input
`100 6 41 6 20 6 18 6 88 ...` view save

correct output
`Yes MMMMUMMMUMUUMMUUUMMMUUUUUMUUUU...` view save

user output
`No` view save

Test 25

Verdict: WRONG ANSWER

input
`100 24 100 92 100 62 100 88 100 ...` view save

correct output
`Yes MUUMMUUMMUMUMUMUUUUUUMMMUMUMUM...` view save

user output
`No` view save

Test 26

Verdict: ACCEPTED

input
`100 65 83 68 83 65 87 21 65 ...` view save

correct output
`No` view save

user output
`No` view save

Test 27

Verdict: ACCEPTED

input
`100 12 87 12 56 41 56 11 41 ...` view save

correct output
`No` view save

user output
`No` view save

Test 28

Verdict: WRONG ANSWER

input
`100 13 29 13 38 13 34 10 13 ...` view save

correct output
`Yes MMMMUUMUMMUUMMUUMMMUMMUUMMUUUU...` view save

user output
`No` view save

Test 29

Verdict: ACCEPTED

input
`100 77 94 52 77 53 77 53 56 ...` view save

correct output
`No` view save

user output
`No` view save

Test 30

Verdict: ACCEPTED

input
`100 56 59 56 76 17 76 17 75 ...` view save

correct output
`No` view save

user output
`No` view save

Test 31

Verdict: WRONG ANSWER

input
`100 19 70 70 86 27 86 27 31 ...` view save

correct output
`Yes MMMMUMMUMMUUMMUMUUUMMMUMUMUUMU...` view save

user output
`No` view save

Test 32

Verdict: RUNTIME ERROR

input
`200 28 148 28 122 28 137 122 178 ...` view save

correct output
`Yes UUMUMMMUUMMUMMMUMMUUMUMUMUMMMU...` view save

user output
(empty)

Error:

Traceback (most recent call last):
  File "/box/input/code.py", line 60, in <module>
    main()
  File "/box/input/code.py", line 29, in main
    adjacency_list[a].append(b)
KeyError: 28

Test 33

Verdict: RUNTIME ERROR

input
`200 57 98 57 153 34 153 98 109 ...` view save

correct output
`No` view save

user output
(empty)

Error:

Traceback (most recent call last):
  File "/box/input/code.py", line 60, in <module>
    main()
  File "/box/input/code.py", line 29, in main
    adjacency_list[a].append(b)
KeyError: 57

Test 34

Verdict: RUNTIME ERROR

input
`200 6 177 6 20 6 158 88 158 ...` view save

correct output
`Yes MUUMUMMMUMUUMUUUUUUMUMMMMUUMMU...` view save

user output
(empty)

Error:

Traceback (most recent call last):
  File "/box/input/code.py", line 60, in <module>
    main()
  File "/box/input/code.py", line 29, in main
    adjacency_list[a].append(b)
KeyError: 6

Test 35

Verdict: RUNTIME ERROR

input
`200 142 178 119 142 142 155 119 140 ...` view save

correct output
`No` view save

user output
(empty)

Error:

Traceback (most recent call last):
  File "/box/input/code.py", line 60, in <module>
    main()
  File "/box/input/code.py", line 29, in main
    adjacency_list[a].append(b)
KeyError: 142

Test 36

Verdict: RUNTIME ERROR

input
`200 83 150 68 83 68 158 135 158 ...` view save

correct output
`Yes MMMUUUUUUMUUUMUMUUMMMUMUUUMMUM...` view save

user output
(empty)

Error:

Traceback (most recent call last):
  File "/box/input/code.py", line 60, in <module>
    main()
  File "/box/input/code.py", line 29, in main
    adjacency_list[a].append(b)
KeyError: 83

Test 37

Verdict: RUNTIME ERROR

input
`200 20 177 87 177 121 177 137 177 ...` view save

correct output
`Yes MMUMUMMMUUUMUMUMMMUMUMUUUUUUMM...` view save

user output
(empty)

Error:

Traceback (most recent call last):
  File "/box/input/code.py", line 60, in <module>
    main()
  File "/box/input/code.py", line 29, in main
    adjacency_list[a].append(b)
KeyError: 20

Test 38

Verdict: RUNTIME ERROR

input
`200 13 139 13 38 13 34 10 38 ...` view save

correct output
`Yes MUMMUUMUUMUUMMUMMMMUMMUMUUUMMU...` view save

user output
(empty)

Error:

Traceback (most recent call last):
  File "/box/input/code.py", line 60, in <module>
    main()
  File "/box/input/code.py", line 29, in main
    adjacency_list[a].append(b)
KeyError: 13

Test 39

Verdict: RUNTIME ERROR

input
`200 84 198 77 198 52 198 53 77 ...` view save

correct output
`Yes MMMUMUMMMUUUUMUUUMMMMMUMUMUUUU...` view save

user output
(empty)

Error:

Traceback (most recent call last):
  File "/box/input/code.py", line 60, in <module>
    main()
  File "/box/input/code.py", line 29, in main
    adjacency_list[a].append(b)
KeyError: 84

Test 40

Verdict: RUNTIME ERROR

input
`200 56 112 76 112 56 182 56 114 ...` view save

correct output
`No` view save

user output
(empty)

Error:

Traceback (most recent call last):
  File "/box/input/code.py", line 60, in <module>
    main()
  File "/box/input/code.py", line 29, in main
    adjacency_list[a].append(b)
KeyError: 56

Test 41

Verdict: RUNTIME ERROR

input
`200 19 114 19 70 70 86 19 27 ...` view save

correct output
`Yes MMMUMUUUUUMUMMMMMMMUUMMUMMMMUM...` view save

user output
(empty)

Error:

Traceback (most recent call last):
  File "/box/input/code.py", line 60, in <module>
    main()
  File "/box/input/code.py", line 29, in main
    adjacency_list[a].append(b)
KeyError: 19

Test 42

Verdict: WRONG ANSWER

input
`1000 811 883 397 883 137 397 546 883 ...` view save

correct output
`Yes MMMMMUUMUMUUUUUUMUMUMMMMUMMUMM...` view save

user output
`No` view save

Test 43

Verdict: ACCEPTED

input
`1000 393 736 393 398 398 407 351 393 ...` view save

correct output
`No` view save

user output
`No` view save

Test 44

Verdict: ACCEPTED

input
`1000 507 955 340 955 507 813 418 955 ...` view save

correct output
`No` view save

user output
`No` view save

Test 45

Verdict: ACCEPTED

input
`1000 230 974 230 440 440 752 752 977 ...` view save

correct output
`No` view save

user output
`No` view save

Test 46

Verdict: WRONG ANSWER

input
`1000 406 944 778 944 68 944 545 778 ...` view save

correct output
`Yes UMUMMUMUUMUUMUUMUMMUUMUUMUUUUM...` view save

user output
`No` view save

Test 47

Verdict: WRONG ANSWER

input
`1000 771 921 368 921 121 921 121 810 ...` view save

correct output
`Yes UMMUUUUUMUMMUMUMUUUUMMMMUMUUMM...` view save

user output
`No` view save

Test 48

Verdict: ACCEPTED

input
`1000 290 518 518 738 518 554 290 997 ...` view save

correct output
`No` view save

user output
`No` view save

Test 49

Verdict: WRONG ANSWER

input
`1000 370 791 390 791 390 835 585 835 ...` view save

correct output
`Yes MMUUUUUMMMUMMUMMMMMMUUMMUMMMMU...` view save

user output
`No` view save

Test 50

Verdict: WRONG ANSWER

input
`1000 111 804 778 804 520 804 520 829 ...` view save

correct output
`Yes MMMUMUUUUUMMMUMMMMMUUMMUMMUUUU...` view save

user output
`No` view save

Test 51

Verdict: WRONG ANSWER

input
`1000 627 823 399 627 27 399 27 945 ...` view save

correct output
`Yes MMUMMMMUUMMUUMUUUUUMUMMUMMMMMU...` view save

user output
`No` view save

Test 52

Verdict: ACCEPTED

input
`100000 26991 68205 21905 68205 3029 26991 21905 29288 ...` view save

correct output
`No` view save

user output
`No` view save

Test 53

Verdict: WRONG ANSWER

input
`100000 41845 94618 94618 96640 65841 94618 9894 96640 ...` view save

correct output
`Yes UMUUUMMUUUMMUMMUMUMMMUMMMUMUMU...` view save

user output
`No` view save

Test 54

Verdict: WRONG ANSWER

input
`100000 11081 29940 11081 90273 11081 56653 56653 73314 ...` view save

correct output
`Yes UMMUUMMMUUMMMMMUUMMUUUMUMMMUUU...` view save

user output
`No` view save

Test 55

Verdict: WRONG ANSWER

input
`100000 27549 31873 27549 48777 48777 71940 48777 59266 ...` view save

correct output
`Yes MMMMUUMUUMUMUMMUUUMMUMMMUMUUUM...` view save

user output
`No` view save

Test 56

Verdict: WRONG ANSWER

input
`100000 2460 57807 2460 59927 56550 59927 35046 56550 ...` view save

correct output
`Yes MMMUUMMUMMUUUMMUMUMMMUMUUMUMUM...` view save

user output
`No` view save

Test 57

Verdict: WRONG ANSWER

input
`100000 13089 77222 77222 89616 36711 89616 27645 77222 ...` view save

correct output
`Yes UMUUUMMMUUUUMMUMMMUUMMUUMUMUMU...` view save

user output
`No` view save

Test 58

Verdict: WRONG ANSWER

input
`100000 35805 70440 70440 82302 64483 82302 64483 96767 ...` view save

correct output
`Yes MMMUUMMMUUUMMMUUMUUMUMMUUUMUUM...` view save

user output
`No` view save

Test 59

Verdict: WRONG ANSWER

input
`100000 16206 68738 37820 68738 55519 68738 55519 77758 ...` view save

correct output
`Yes MMUUUMUUMUUMUUMUMMMMMUMUUUUUUU...` view save

user output
`No` view save

Test 60

Verdict: WRONG ANSWER

input
`100000 47137 86808 47137 80136 47137 73346 73346 78144 ...` view save

correct output
`Yes UUMUMMUUUUMMMMMMMMUUMMMMMMUUMU...` view save

user output
`No` view save

Test 61

Verdict: ACCEPTED

input
`100000 39438 53660 53660 60245 20924 60245 20924 38669 ...` view save

correct output
`No` view save

user output
`No` view save

Aalto Competitive Programming 2026 - wk2 - Wed

Astralis session I

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

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Test 36

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Test 48

Test 49

Test 50

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Test 52

Test 53

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Test 56

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Test 58

Test 59

Test 60

Test 61

Tasks

Submissions (aalto26bw_004)