answer.code: In function ‘void solve()’:
answer.code:38:13: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   38 | signed main () {
      |             ^~
answer.code:38:13: note: remove parentheses to default-initialize a variable
   38 | signed main () {
      |             ^~
      |             --
answer.code:38:13: note: or replace parentheses with braces to value-initialize a variable
answer.code:38:16: error: a function-definition is not allowed here before ‘{’ token
   38 | signed main () {
      |                ^
answer.code:46:2: error: expected ‘}’ at end of input
   46 | }
      |  ^
answer.code:7:15: note: to match this ‘{’
    7 | void solve () {
      |               ^