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input/code.cpp: In function 'void solve()':
input/code.cpp:18:7: warning: unused variable 's' [-Wunused-variable]
   18 |    ll s = n * m;
      |       ^
input/code.cpp:19:7: warning: unused variable 'index' [-Wunused-variable]
   19 |    ll index = 0;
      |       ^~~~~
input/code.cpp:20:7: warning: unused variable 'curn' [-Wunused-variable]
   20 |    ll curn = 1, curm = 1;
      |       ^~~~
input/code.cpp:20:17: warning: unused variable 'curm' [-Wunused-variable]
   20 |    ll curn = 1, curm = 1;
      |                 ^~~~

#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll; 
const ll INF = 1e18;
const int MAXN = 1e3 + 1;
 
ll n, m;

void solve() {
   cin >> n >> m;
   
   if (n % 2 == 1 and m % 2 == 1) {
       cout << -1; 
       return;
   }
   
   ll s = n * m;
   ll index = 0;
   ll curn = 1, curm = 1; 
   
   
   cout << 'D';
   for (int i = 1; i <= m; i++) {
       for (int j = 1; j < n - 1; j++) {
           if (i % 2 == 1) {
               cout << 'D';
           } else {
               cout << 'U';
           }
       }
       if (i != m) cout << 'R';
   }
   
   cout << 'U';
   for (int i = 1; i < m; i++) cout << 'L';
   
   
    
    
}
 
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
 
    solve();
 
    return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED

Test 17

Verdict: WRONG ANSWER

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: ACCEPTED

Test 21

Verdict: ACCEPTED

Test 22

Verdict: ACCEPTED

Test 23

Verdict: ACCEPTED

Test 24

Verdict: ACCEPTED

Test 25

Verdict: ACCEPTED

Test 26

Verdict: ACCEPTED

Test 27

Verdict: ACCEPTED

Test 28

Verdict: ACCEPTED

Test 29

Verdict: ACCEPTED

Test 30

Verdict: WRONG ANSWER

Test 31

Verdict: ACCEPTED

Test 32

Verdict: ACCEPTED

Test 33

Verdict: WRONG ANSWER

Test 34

Verdict: ACCEPTED

Test 35

Verdict: WRONG ANSWER

Test 36

Verdict: ACCEPTED

Test 37

Verdict: ACCEPTED

Test 38

Verdict: ACCEPTED

Test 39

Verdict: ACCEPTED

Test 40

Verdict: ACCEPTED

Test 41

Verdict: WRONG ANSWER

Test 42

Verdict: ACCEPTED

Test 43

Verdict: ACCEPTED

Test 44

Verdict: ACCEPTED

Test 45

Verdict: ACCEPTED

Test 46

Verdict: ACCEPTED

Test 47

Verdict: ACCEPTED

Test 48

Verdict: ACCEPTED

Test 49

Verdict: ACCEPTED

Test 50

Verdict: ACCEPTED

Test 51

Verdict: WRONG ANSWER

Test 52

Verdict: ACCEPTED

Test 53

Verdict: ACCEPTED

Test 54

Verdict: WRONG ANSWER

Test 55

Verdict: WRONG ANSWER

Test 56

Verdict: ACCEPTED