expgorl.cpp:84:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
84 | main() {
| ^~~~
expgorl.cpp: In function 'int main()':
expgorl.cpp:4:48: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
4 | #define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~
expgorl.cpp:85:2: note: in expansion of macro 'file'
85 | file("expgorl");
| ^~~~
expgorl.cpp:4:77: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
4 | #define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
expgorl.cpp:85:2: note: in expansion of macro 'file'
85 | file("expgorl");
| ^~~~