CSES - Aalto Competitive Programming 2025 - wk9 - Mon

Submission details
Task:	Chess board tour
Sender:	Ciphra
Submission time:	2025-11-03 17:17:34 +0200
Language:	C++ (C++17)
Status:	READY
Result:	ACCEPTED

Test results
test	verdict	time
#1	ACCEPTED	0.00 s	details
#2	ACCEPTED	0.00 s	details
#3	ACCEPTED	0.00 s	details
#4	ACCEPTED	0.00 s	details
#5	ACCEPTED	0.00 s	details
#6	ACCEPTED	0.00 s	details
#7	ACCEPTED	0.00 s	details
#8	ACCEPTED	0.00 s	details
#9	ACCEPTED	0.00 s	details
#10	ACCEPTED	0.00 s	details
#11	ACCEPTED	0.00 s	details
#12	ACCEPTED	0.01 s	details
#13	ACCEPTED	0.00 s	details
#14	ACCEPTED	0.00 s	details
#15	ACCEPTED	0.00 s	details
#16	ACCEPTED	0.00 s	details
#17	ACCEPTED	0.00 s	details
#18	ACCEPTED	0.00 s	details
#19	ACCEPTED	0.00 s	details
#20	ACCEPTED	0.00 s	details
#21	ACCEPTED	0.00 s	details
#22	ACCEPTED	0.00 s	details
#23	ACCEPTED	0.00 s	details
#24	ACCEPTED	0.00 s	details
#25	ACCEPTED	0.00 s	details
#26	ACCEPTED	0.00 s	details
#27	ACCEPTED	0.00 s	details
#28	ACCEPTED	0.00 s	details
#29	ACCEPTED	0.00 s	details
#30	ACCEPTED	0.00 s	details
#31	ACCEPTED	0.00 s	details
#32	ACCEPTED	0.00 s	details
#33	ACCEPTED	0.00 s	details
#34	ACCEPTED	0.00 s	details
#35	ACCEPTED	0.00 s	details
#36	ACCEPTED	0.00 s	details
#37	ACCEPTED	0.00 s	details
#38	ACCEPTED	0.00 s	details
#39	ACCEPTED	0.00 s	details
#40	ACCEPTED	0.00 s	details
#41	ACCEPTED	0.00 s	details
#42	ACCEPTED	0.00 s	details
#43	ACCEPTED	0.00 s	details
#44	ACCEPTED	0.00 s	details
#45	ACCEPTED	0.00 s	details
#46	ACCEPTED	0.00 s	details
#47	ACCEPTED	0.00 s	details
#48	ACCEPTED	0.00 s	details
#49	ACCEPTED	0.00 s	details
#50	ACCEPTED	0.00 s	details
#51	ACCEPTED	0.01 s	details
#52	ACCEPTED	0.00 s	details
#53	ACCEPTED	0.01 s	details
#54	ACCEPTED	0.00 s	details
#55	ACCEPTED	0.00 s	details
#56	ACCEPTED	0.00 s	details

Code



#include <iostream>
#include <string>
int main(){
  int n,m;
  std::cin >> n >> m;
  std::string sequence = "";

  if (m==2){
    sequence = std::string(n-1, 'D') + "R" + std::string(n-1, 'U') + "L";
    std::cout << sequence << "\n";
    return 0;
  }
  if (n==2){
    sequence = std::string(m-1, 'R') + "D" + std::string(m-1, 'L') + "U";
    std::cout << sequence << "\n";
    return 0;
  }

  if (n%2 == 1 && m%2 == 1){
    std::cout << -1 << "\n";
    return 0;
  }
  
  //N is even, m is odd|even
  if (n%2 == 0){
    sequence = std::string(n-1, 'D') + "R";
    int turn = 0;
    for (int row = 0; row<n-1; ++row){
      if (turn == 0){
        sequence+= std::string(m-2, 'R');
      }else {
        sequence+= std::string(m-2, 'L');
      }
      sequence+= "U";
      turn ^= 1; //swap
    }
    sequence+= std::string(m-1, 'L'); // last top row
    std::cout << sequence << "\n";
    return 0;
  }
  
  //M is even, N is odd|even
  if (m%2 == 0){
    sequence = std::string(m-1, 'R') + "D";
    int turn = 0;
    for (int col = 0; col<m-1; ++col){
      if (turn == 0){
        sequence+= std::string(n-2, 'D');
      }else {
        sequence+= std::string(n-2, 'U');
      }
      sequence+= "L";
      turn ^= 1; //swap
    }
    sequence+= std::string(n-1, 'U'); // last left col
    std::cout << sequence << "\n";
    return 0;
  }

}

Test details

Test 1

Verdict: ACCEPTED

input
`2 2` view save

correct output
`DRUL` view save

user output
`DRUL` view save

Test 2

Verdict: ACCEPTED

input
`2 2` view save

correct output
`DRUL` view save

user output
`DRUL` view save

Test 3

Verdict: ACCEPTED

input
`2 3` view save

correct output
`RRDLLU` view save

user output
`RRDLLU` view save

Test 4

Verdict: ACCEPTED

input
`2 2` view save

correct output
`DRUL` view save

user output
`DRUL` view save

Test 5

Verdict: ACCEPTED

input
`4 4` view save

correct output
`DDDRUURDDRUUULLL` view save

user output
`DDDRRRULLURRULLL` view save

Test 6

Verdict: ACCEPTED

input
`3 3` view save

correct output
`-1` view save

user output
`-1` view save

Test 7

Verdict: ACCEPTED

input
`4 4` view save

correct output
`DDDRUURDDRUUULLL` view save

user output
`DDDRRRULLURRULLL` view save

Test 8

Verdict: ACCEPTED

input
`3 5` view save

correct output
`-1` view save

user output
`-1` view save

Test 9

Verdict: ACCEPTED

input
`3 2` view save

correct output
`DDRUUL` view save

user output
`DDRUUL` view save

Test 10

Verdict: ACCEPTED

input
`4 2` view save

correct output
`DDDRUUUL` view save

user output
`DDDRUUUL` view save

Test 11

Verdict: ACCEPTED

input
`5 5` view save

correct output
`-1` view save

user output
`-1` view save

Test 12

Verdict: ACCEPTED

input
`2 2` view save

correct output
`DRUL` view save

user output
`DRUL` view save

Test 13

Verdict: ACCEPTED

input
`5 5` view save

correct output
`-1` view save

user output
`-1` view save

Test 14

Verdict: ACCEPTED

input
`2 2` view save

correct output
`DRUL` view save

user output
`DRUL` view save

Test 15

Verdict: ACCEPTED

input
`5 2` view save

correct output
`DDDDRUUUUL` view save

user output
`DDDDRUUUUL` view save

Test 16

Verdict: ACCEPTED

input
`2 3` view save

correct output
`RRDLLU` view save

user output
`RRDLLU` view save

Test 17

Verdict: ACCEPTED

input
`6 7` view save

correct output
`RRRRRRDLLLLLDRRRRRDLLLLLDRRRRR...` view save

user output
`DDDDDRRRRRRULLLLLURRRRRULLLLLU...` view save

Test 18

Verdict: ACCEPTED

input
`5 10` view save

correct output
`DDDDRUUURDDDRUUURDDDRUUURDDDRU...` view save

user output
`RRRRRRRRRDDDDLUUULDDDLUUULDDDL...` view save

Test 19

Verdict: ACCEPTED

input
`5 3` view save

correct output
`-1` view save

user output
`-1` view save

Test 20

Verdict: ACCEPTED

input
`6 2` view save

correct output
`DDDDDRUUUUUL` view save

user output
`DDDDDRUUUUUL` view save

Test 21

Verdict: ACCEPTED

input
`10 10` view save

correct output
`DDDDDDDDDRUUUUUUUURDDDDDDDDRUU...` view save

user output
`DDDDDDDDDRRRRRRRRRULLLLLLLLURR...` Truncated

Test 22

Verdict: ACCEPTED

input
`3 2` view save

correct output
`DDRUUL` view save

user output
`DDRUUL` view save

Test 23

Verdict: ACCEPTED

input
`10 10` view save

correct output
`DDDDDDDDDRUUUUUUUURDDDDDDDDRUU...` view save

user output
`DDDDDDDDDRRRRRRRRRULLLLLLLLURR...` Truncated

Test 24

Verdict: ACCEPTED

input
`2 4` view save

correct output
`DRRRULLL` view save

user output
`RRRDLLLU` view save

Test 25

Verdict: ACCEPTED

input
`9 2` view save

correct output
`DDDDDDDDRUUUUUUUUL` view save

user output
`DDDDDDDDRUUUUUUUUL` view save

Test 26

Verdict: ACCEPTED

input
`2 5` view save

correct output
`RRRRDLLLLU` view save

user output
`RRRRDLLLLU` view save

Test 27

Verdict: ACCEPTED

input
`56 60` view save

correct output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` view save

user output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` Truncated

Test 28

Verdict: ACCEPTED

input
`43 100` view save

correct output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` view save

user output
`RRRRRRRRRRRRRRRRRRRRRRRRRRRRRR...` Truncated

Test 29

Verdict: ACCEPTED

input
`45 20` view save

correct output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` view save

user output
`RRRRRRRRRRRRRRRRRRRDDDDDDDDDDD...` Truncated

Test 30

Verdict: ACCEPTED

input
`56 9` view save

correct output
`RRRRRRRRDLLLLLLLDRRRRRRRDLLLLL...` view save

user output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` Truncated

Test 31

Verdict: ACCEPTED

input
`97 91` view save

correct output
`-1` view save

user output
`-1` view save

Test 32

Verdict: ACCEPTED

input
`23 7` view save

correct output
`-1` view save

user output
`-1` view save

Test 33

Verdict: ACCEPTED

input
`90 95` view save

correct output
`RRRRRRRRRRRRRRRRRRRRRRRRRRRRRR...` view save

user output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` Truncated

Test 34

Verdict: ACCEPTED

input
`9 24` view save

correct output
`DDDDDDDDRUUUUUUURDDDDDDDRUUUUU...` view save

user output
`RRRRRRRRRRRRRRRRRRRRRRRDDDDDDD...` Truncated

Test 35

Verdict: ACCEPTED

input
`88 3` view save

correct output
`RRDLDRDLDRDLDRDLDRDLDRDLDRDLDR...` view save

user output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` Truncated

Test 36

Verdict: ACCEPTED

input
`3 38` view save

correct output
`DDRURDRURDRURDRURDRURDRURDRURD...` view save

user output
`RRRRRRRRRRRRRRRRRRRRRRRRRRRRRR...` Truncated

Test 37

Verdict: ACCEPTED

input
`111 119` view save

correct output
`-1` view save

user output
`-1` view save

Test 38

Verdict: ACCEPTED

input
`84 200` view save

correct output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` view save

user output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` Truncated

Test 39

Verdict: ACCEPTED

input
`88 38` view save

correct output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` view save

user output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` Truncated

Test 40

Verdict: ACCEPTED

input
`111 16` view save

correct output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` view save

user output
`RRRRRRRRRRRRRRRDDDDDDDDDDDDDDD...` Truncated

Test 41

Verdict: ACCEPTED

input
`194 181` view save

correct output
`RRRRRRRRRRRRRRRRRRRRRRRRRRRRRR...` view save

user output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` Truncated

Test 42

Verdict: ACCEPTED

input
`46 12` view save

correct output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` view save

user output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` Truncated

Test 43

Verdict: ACCEPTED

input
`179 190` view save

correct output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` view save

user output
`RRRRRRRRRRRRRRRRRRRRRRRRRRRRRR...` Truncated

Test 44

Verdict: ACCEPTED

input
`17 47` view save

correct output
`-1` view save

user output
`-1` view save

Test 45

Verdict: ACCEPTED

input
`175 4` view save

correct output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` view save

user output
`RRRDDDDDDDDDDDDDDDDDDDDDDDDDDD...` Truncated

Test 46

Verdict: ACCEPTED

input
`4 74` view save

correct output
`DDDRUURDDRUURDDRUURDDRUURDDRUU...` view save

user output
`DDDRRRRRRRRRRRRRRRRRRRRRRRRRRR...` Truncated

Test 47

Verdict: ACCEPTED

input
`550 594` view save

correct output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` view save

user output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` Truncated

Test 48

Verdict: ACCEPTED

input
`418 998` view save

correct output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` view save

user output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` Truncated

Test 49

Verdict: ACCEPTED

input
`437 186` view save

correct output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` view save

user output
`RRRRRRRRRRRRRRRRRRRRRRRRRRRRRR...` Truncated

Test 50

Verdict: ACCEPTED

input
`552 72` view save

correct output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` view save

user output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` Truncated

Test 51

Verdict: ACCEPTED

input
`968 901` view save

correct output
`RRRRRRRRRRRRRRRRRRRRRRRRRRRRRR...` view save

user output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` Truncated

Test 52

Verdict: ACCEPTED

input
`223 57` view save

correct output
`-1` view save

user output
`-1` view save

Test 53

Verdict: ACCEPTED

input
`893 948` view save

correct output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` view save

user output
`RRRRRRRRRRRRRRRRRRRRRRRRRRRRRR...` Truncated

Test 54

Verdict: ACCEPTED

input
`78 229` view save

correct output
`RRRRRRRRRRRRRRRRRRRRRRRRRRRRRR...` view save

user output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` Truncated

Test 55

Verdict: ACCEPTED

input
`874 13` view save

correct output
`RRRRRRRRRRRRDLLLLLLLLLLLDRRRRR...` view save

user output
`DDDDDDDDDDDDDDDDDDDDDDDDDDDDDD...` Truncated

Test 56

Verdict: ACCEPTED

input
`12 366` view save

correct output
`DDDDDDDDDDDRUUUUUUUUUURDDDDDDD...` view save

user output
`DDDDDDDDDDDRRRRRRRRRRRRRRRRRRR...` Truncated

Aalto Competitive Programming 2025 - wk9 - Mon

Chess board tour

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

Test 18

Test 19

Test 20

Test 21

Test 22

Test 23

Test 24

Test 25

Test 26

Test 27

Test 28

Test 29

Test 30

Test 31

Test 32

Test 33

Test 34

Test 35

Test 36

Test 37

Test 38

Test 39

Test 40

Test 41

Test 42

Test 43

Test 44

Test 45

Test 46

Test 47

Test 48

Test 49

Test 50

Test 51

Test 52

Test 53

Test 54

Test 55

Test 56

Tasks

Submissions (Ciphra)