collider.cpp:21:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
21 | main(){
| ^
collider.cpp: In function 'int main()':
collider.cpp:12:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
12 | #define scan2(a,b) scanf("%lld %lld",&a, &b);
| ~~~~~^~~~~~~~~~~~~~~~~~~~
collider.cpp:23:5: note: in expansion of macro 'scan2'
23 | scan2(n,m)
| ^~~~~
collider.cpp:11:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
11 | #define scan1(a) scanf("%lld",&a);
| ~~~~~^~~~~~~~~~~
collider.cpp:35:13: note: in expansion of macro 'scan1'
35 | scan1(x)
| ^~~~~
collider.cpp:12:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
12 | #define scan2(a,b) scanf("%lld %lld",&a, &b);
| ~~~~~^~~~~~~~~~~~~~~~~~~~
collider.cpp:41:13: note: in expansion of macro 'scan2'
41 | scan2(x,y)
| ^~~~~