port_facility.cpp: In function 'int main()':
port_facility.cpp:47:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
47 | freopen("INP.INP" ,"r" , stdin) ;
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
port_facility.cpp:48:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
48 | freopen("OUT.OUT" , "w" , stdout) ;
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~