CSES - Aalto Competitive Programming 2025 - wk2 - Wed

Submission details
Task:	Astralis session I
Sender:	aalto25b_006
Submission time:	2025-09-10 16:35:36 +0300
Language:	C++ (C++17)
Status:	READY
Result:	ACCEPTED

Test results
test	verdict	time
#1	ACCEPTED	0.01 s	details
#2	ACCEPTED	0.01 s	details
#3	ACCEPTED	0.01 s	details
#4	ACCEPTED	0.01 s	details
#5	ACCEPTED	0.01 s	details
#6	ACCEPTED	0.01 s	details
#7	ACCEPTED	0.01 s	details
#8	ACCEPTED	0.01 s	details
#9	ACCEPTED	0.01 s	details
#10	ACCEPTED	0.01 s	details
#11	ACCEPTED	0.01 s	details
#12	ACCEPTED	0.01 s	details
#13	ACCEPTED	0.01 s	details
#14	ACCEPTED	0.01 s	details
#15	ACCEPTED	0.01 s	details
#16	ACCEPTED	0.01 s	details
#17	ACCEPTED	0.01 s	details
#18	ACCEPTED	0.01 s	details
#19	ACCEPTED	0.01 s	details
#20	ACCEPTED	0.01 s	details
#21	ACCEPTED	0.01 s	details
#22	ACCEPTED	0.01 s	details
#23	ACCEPTED	0.01 s	details
#24	ACCEPTED	0.01 s	details
#25	ACCEPTED	0.01 s	details
#26	ACCEPTED	0.01 s	details
#27	ACCEPTED	0.01 s	details
#28	ACCEPTED	0.01 s	details
#29	ACCEPTED	0.01 s	details
#30	ACCEPTED	0.01 s	details
#31	ACCEPTED	0.01 s	details
#32	ACCEPTED	0.01 s	details
#33	ACCEPTED	0.01 s	details
#34	ACCEPTED	0.01 s	details
#35	ACCEPTED	0.01 s	details
#36	ACCEPTED	0.01 s	details
#37	ACCEPTED	0.01 s	details
#38	ACCEPTED	0.01 s	details
#39	ACCEPTED	0.01 s	details
#40	ACCEPTED	0.01 s	details
#41	ACCEPTED	0.01 s	details
#42	ACCEPTED	0.01 s	details
#43	ACCEPTED	0.01 s	details
#44	ACCEPTED	0.01 s	details
#45	ACCEPTED	0.01 s	details
#46	ACCEPTED	0.01 s	details
#47	ACCEPTED	0.01 s	details
#48	ACCEPTED	0.01 s	details
#49	ACCEPTED	0.01 s	details
#50	ACCEPTED	0.01 s	details
#51	ACCEPTED	0.01 s	details
#52	ACCEPTED	0.06 s	details
#53	ACCEPTED	0.06 s	details
#54	ACCEPTED	0.06 s	details
#55	ACCEPTED	0.06 s	details
#56	ACCEPTED	0.07 s	details
#57	ACCEPTED	0.06 s	details
#58	ACCEPTED	0.06 s	details
#59	ACCEPTED	0.06 s	details
#60	ACCEPTED	0.06 s	details
#61	ACCEPTED	0.06 s	details

Code

#include <iostream>
#include <vector>

using namespace std;

const int N = 1e5 + 5;

int n;
vector<int> g[N];
bool vis[N];
int sz[N], lv[N];
char ans[N];

void dfs(int u) {
  sz[u] = 1;
  vis[u] = true;
  for (int v : g[u]) {
    if (!vis[v]) {
      lv[v] = lv[u] + 1;
      dfs(v);
      sz[u] += sz[v];
    }
  }
}

void re_dfs(int u) {
  ans[u] = 'M';
  for (int v : g[u]) {
    if (lv[v] > lv[u]) {
      re_dfs(v);
    }
  }
}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cin >> n;
  for (int i = 1; i <= n - 1; i++) {
    int a, b;
    cin >> a >> b;
    g[a].emplace_back(b);
    g[b].emplace_back(a);
  }
  dfs(1);
  for (int i = 1; i <= n; i++) {
    if (sz[i] == n / 2) {
      cout << "Yes" << '\n';
      for (int j = 1; j <= n; j++) {
        ans[j] = 'U';
      }
      re_dfs(i);
      for (int j = 1; j <= n; j++) {
        cout << ans[j];
      }
      return 0;
    }
  }
  cout << "No" << '\n';
  return 0;
}

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: ACCEPTED

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

correct output
`Yes MUMUMU` view save

user output
`Yes UMUMUM` view save

Test 6

Verdict: ACCEPTED

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

correct output
`Yes MUMUMUUM` view save

user output
`Yes UMUMUMMU` view save

Test 7

Verdict: ACCEPTED

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

correct output
`Yes MUUMMUMU` view save

user output
`Yes UMMUUMUM` 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: ACCEPTED

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

correct output
`Yes MMUMUMUU` view save

user output
`Yes UUMUMUMM` view save

Test 10

Verdict: ACCEPTED

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

correct output
`Yes MUMMMUMUUU` view save

user output
`Yes UMUUUMUMMM` 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: ACCEPTED

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

correct output
`Yes MMMUUMUMUU` view save

user output
`Yes UUUMMUMUMM` 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: ACCEPTED

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

correct output
`Yes UUUMUMMUMUMM` view save

user output
`Yes UUUMUMMUMUMM` view save

Test 16

Verdict: ACCEPTED

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

correct output
`Yes MUMMMUUMUUUM` view save

user output
`Yes UMUUUMMUMMMU` 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: ACCEPTED

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

correct output
`Yes UMMMMUMUUMUUMU` view save

user output
`Yes UMMMMUMUUMUUMU` view save

Test 19

Verdict: ACCEPTED

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

correct output
`Yes MUUUMMUUUMMMMU` view save

user output
`Yes UMMMUUMMMUUUUM` 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: ACCEPTED

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

correct output
`Yes MMUUMUMMUMUMUUMUUMMUUUMMMUUUUM...` view save

user output
`Yes UUMMUMUUMUMUMMUMMUUMMMUUUMMMMU...` Truncated

Test 23

Verdict: ACCEPTED

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

correct output
`Yes MUUMUMUUUMMUMMUMUMMMMMUUUMUUMM...` view save

user output
`Yes UMMUMUMMMUUMUUMUMUUUUUMMMUMMUU...` Truncated

Test 24

Verdict: ACCEPTED

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

correct output
`Yes MMMMUMMMUMUUMMUUUMMMUUUUUMUUUU...` view save

user output
`Yes UUUUMUUUMUMMUUMMMUUUMMMMMUMMMM...` Truncated

Test 25

Verdict: ACCEPTED

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

correct output
`Yes MUUMMUUMMUMUMUMUUUUUUMMMUMUMUM...` view save

user output
`Yes UMMUUMMUUMUMUMUMMMMMMUUUMUMUMU...` Truncated

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: ACCEPTED

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

correct output
`Yes MMMMUUMUMMUUMMUUMMMUMMUUMMUUUU...` view save

user output
`Yes UUUUMMUMUUMMUUMMUUUMUUMMUUMMMM...` Truncated

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: ACCEPTED

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

correct output
`Yes MMMMUMMUMMUUMMUMUUUMMMUMUMUUMU...` view save

user output
`Yes UUUUMUUMUUMMUUMUMMMUUUMUMUMMUM...` Truncated

Test 32

Verdict: ACCEPTED

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

correct output
`Yes UUMUMMMUUMMUMMMUMMUUMUMUMUMMMU...` view save

user output
`Yes UUMUMMMUUMMUMMMUMMUUMUMUMUMMMU...` Truncated

Test 33

Verdict: ACCEPTED

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

correct output
`No` view save

user output
`No` view save

Test 34

Verdict: ACCEPTED

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

correct output
`Yes MUUMUMMMUMUUMUUUUUUMUMMMMUUMMU...` view save

user output
`Yes UMMUMUUUMUMMUMMMMMMUMUUUUMMUUM...` Truncated

Test 35

Verdict: ACCEPTED

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

correct output
`No` view save

user output
`No` view save

Test 36

Verdict: ACCEPTED

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

correct output
`Yes MMMUUUUUUMUUUMUMUUMMMUMUUUMMUM...` view save

user output
`Yes UUUMMMMMMUMMMUMUMMUUUMUMMMUUMU...` Truncated

Test 37

Verdict: ACCEPTED

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

correct output
`Yes MMUMUMMMUUUMUMUMMMUMUMUUUUUUMM...` view save

user output
`Yes UUMUMUUUMMMUMUMUUUMUMUMMMMMMUU...` Truncated

Test 38

Verdict: ACCEPTED

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

correct output
`Yes MUMMUUMUUMUUMMUMMMMUMMUMUUUMMU...` view save

user output
`Yes UMUUMMUMMUMMUUMUUUUMUUMUMMMUUM...` Truncated

Test 39

Verdict: ACCEPTED

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

correct output
`Yes MMMUMUMMMUUUUMUUUMMMMMUMUMUUUU...` view save

user output
`Yes UUUMUMUUUMMMMUMMMUUUUUMUMUMMMM...` Truncated

Test 40

Verdict: ACCEPTED

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

correct output
`No` view save

user output
`No` view save

Test 41

Verdict: ACCEPTED

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

correct output
`Yes MMMUMUUUUUMUMMMMMMMUUMMUMMMMUM...` view save

user output
`Yes UUUMUMMMMMUMUUUUUUUMMUUMUUUUMU...` Truncated

Test 42

Verdict: ACCEPTED

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

correct output
`Yes MMMMMUUMUMUUUUUUMUMUMMMMUMMUMM...` view save

user output
`Yes UUUUUMMUMUMMMMMMUMUMUUUUMUUMUU...` Truncated

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: ACCEPTED

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

correct output
`Yes UMUMMUMUUMUUMUUMUMMUUMUUMUUUUM...` view save

user output
`Yes UMUMMUMUUMUUMUUMUMMUUMUUMUUUUM...` Truncated

Test 47

Verdict: ACCEPTED

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

correct output
`Yes UMMUUUUUMUMMUMUMUUUUMMMMUMUUMM...` view save

user output
`Yes UMMUUUUUMUMMUMUMUUUUMMMMUMUUMM...` Truncated

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: ACCEPTED

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

correct output
`Yes MMUUUUUMMMUMMUMMMMMMUUMMUMMMMU...` view save

user output
`Yes UUMMMMMUUUMUUMUUUUUUMMUUMUUUUM...` Truncated

Test 50

Verdict: ACCEPTED

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

correct output
`Yes MMMUMUUUUUMMMUMMMMMUUMMUMMUUUU...` view save

user output
`Yes UUUMUMMMMMUUUMUUUUUMMUUMUUMMMM...` Truncated

Test 51

Verdict: ACCEPTED

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

correct output
`Yes MMUMMMMUUMMUUMUUUUUMUMMUMMMMMU...` view save

user output
`Yes UUMUUUUMMUUMMUMMMMMUMUUMUUUUUM...` Truncated

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: ACCEPTED

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

correct output
`Yes UMUUUMMUUUMMUMMUMUMMMUMMMUMUMU...` view save

user output
`Yes UMUUUMMUUUMMUMMUMUMMMUMMMUMUMU...` Truncated

Test 54

Verdict: ACCEPTED

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

correct output
`Yes UMMUUMMMUUMMMMMUUMMUUUMUMMMUUU...` view save

user output
`Yes UMMUUMMMUUMMMMMUUMMUUUMUMMMUUU...` Truncated

Test 55

Verdict: ACCEPTED

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

correct output
`Yes MMMMUUMUUMUMUMMUUUMMUMMMUMUUUM...` view save

user output
`Yes UUUUMMUMMUMUMUUMMMUUMUUUMUMMMU...` Truncated

Test 56

Verdict: ACCEPTED

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

correct output
`Yes MMMUUMMUMMUUUMMUMUMMMUMUUMUMUM...` view save

user output
`Yes UUUMMUUMUUMMMUUMUMUUUMUMMUMUMU...` Truncated

Test 57

Verdict: ACCEPTED

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

correct output
`Yes UMUUUMMMUUUUMMUMMMUUMMUUMUMUMU...` view save

user output
`Yes UMUUUMMMUUUUMMUMMMUUMMUUMUMUMU...` Truncated

Test 58

Verdict: ACCEPTED

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

correct output
`Yes MMMUUMMMUUUMMMUUMUUMUMMUUUMUUM...` view save

user output
`Yes UUUMMUUUMMMUUUMMUMMUMUUMMMUMMU...` Truncated

Test 59

Verdict: ACCEPTED

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

correct output
`Yes MMUUUMUUMUUMUUMUMMMMMUMUUUUUUU...` view save

user output
`Yes UUMMMUMMUMMUMMUMUUUUUMUMMMMMMM...` Truncated

Test 60

Verdict: ACCEPTED

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

correct output
`Yes UUMUMMUUUUMMMMMMMMUUMMMMMMUUMU...` view save

user output
`Yes UUMUMMUUUUMMMMMMMMUUMMMMMMUUMU...` Truncated

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 2025 - wk2 - Wed

Astralis session I

Code

Test details

Test 1

Test 2

Test 3

Test 4

Test 5

Test 6

Test 7

Test 8

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Test 10

Test 11

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Test 60

Test 61

Tasks

Submissions (aalto25b_006)