foo.cc:12:11: error: expected identifier before '(' token
void union(int x, int y){
^
foo.cc:12:12: error: expected unqualified-id before 'int'
void union(int x, int y){
^~~
foo.cc:12:12: error: expected ')' before 'int'
foo.cc: In function 'int main()':
foo.cc:26:4: error: expected primary-expression before 'union'
union(a,b);
^~~~~
foo.cc:25:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d",&a,&b);
~~~~~^~~~~~~~~~~~~~
foo.cc:29:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d",&a,&b);
~~~~~^~~~~~~~~~~~~~
自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。