answer.code:151:11: error: redefinition of ‘const int L’
  151 | const int L = 5e8;
      |           ^
answer.code:7:11: note: ‘const int L’ previously defined here
    7 | const int L = 5e8;
      |           ^
answer.code:152:5: error: redefinition of ‘int id(int, int)’
  152 | int id (int x, int y) {
      |     ^~
answer.code:8:5: note: ‘int id(int, int)’ previously defined here
    8 | int id (int x, int y) {
      |     ^~
answer.code:155:6: error: redefinition of ‘void work()’
  155 | void work() {
      |      ^~~~
answer.code:11:6: note: ‘void work()’ previously defined here
   11 | void work() {
      |      ^~~~
answer.code:237:5: error: redefinition of ‘int main()’
  237 | int main() {
      |     ^~~~
answer.code:93:5: note: ‘int main()’ previously defined here
   93 | int main() {
      |     ^~~~