answer.code: In lambda function:
answer.code:52:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   52 | int main() {
      |         ^~
answer.code:52:9: note: remove parentheses to default-initialize a variable
   52 | int main() {
      |         ^~
      |         --
answer.code:52:9: note: or replace parentheses with braces to value-initialize a variable
answer.code:52:12: error: a function-definition is not allowed here before ‘{’ token
   52 | int main() {
      |            ^