int hack(){
int i=2;
while(i++)if(collisions({1, i}))return i-1;
}
컴파일 시 표준 에러 (stderr) 메시지
hack.cpp: In function 'int hack()':
hack.cpp:3:14: error: 'collisions' was not declared in this scope
3 | while(i++)if(collisions({1, i}))return i-1;
| ^~~~~~~~~~
hack.cpp:4:1: warning: control reaches end of non-void function [-Wreturn-type]
4 | }
| ^