Compilare: user.cpp: In function ‘int main()’: user.cpp:40:13: warning: unused variable ‘l’ [-Wunused-variable] int l=v[poz].x; ^ user.cpp:41:13: warning: unused variable ‘r’ [-Wunused-variable] int r=v[poz].y; ^ user.cpp:35:9: warning: variable ‘lim’ set but not used [-Wunused-but-set-variable] int lim=m; ^ user.cpp:28:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pcb.in","r",stdin); ^ user.cpp:29:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pcb.out","w",stdout); ^ user.cpp:30:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&k); ^ user.cpp:32:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&v[i].x,&v[i].y); ^