answer.code: In function ‘void solve()’:
answer.code:50:12: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   50 | signed main() {
      |            ^~
answer.code:50:12: note: remove parentheses to default-initialize a variable
   50 | signed main() {
      |            ^~
      |            --
answer.code:50:12: note: or replace parentheses with braces to value-initialize a variable
answer.code:50:15: error: a function-definition is not allowed here before ‘{’ token
   50 | signed main() {
      |               ^
answer.code:59:2: error: expected ‘}’ at end of input
   59 | }
      |  ^
answer.code:6:14: note: to match this ‘{’
    6 | void solve() {
      |              ^