Main.cc: In function ‘ll tongGCD(int)’:
Main.cc:17:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
17 | int main() {
| ^~
Main.cc:17:9: note: remove parentheses to default-initialize a variable
17 | int main() {
| ^~
| --
Main.cc:17:9: note: or replace parentheses with braces to value-initialize a variable
Main.cc:17:12: error: a function-definition is not allowed here before ‘{’ token
17 | int main() {
| ^
Main.cc:24:2: error: expected ‘}’ at end of input
24 | }
| ^
Main.cc:8:19: note: to match this ‘{’
8 | ll tongGCD(int n) {
| ^
Main.cc:24:2: warning: control reaches end of non-void function [-Wreturn-type]
24 | }
| ^