Compilare: user.cpp: In function ‘int main()’: user.cpp:21:5: warning: unused variable ‘difmax’ [-Wunused-variable] int difmax=0,dm1=0,poz,poz1,poz2,poz3; ^ user.cpp:21:14: warning: unused variable ‘dm1’ [-Wunused-variable] int difmax=0,dm1=0,poz,poz1,poz2,poz3; ^ user.cpp:10:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tribute.in","r",stdin); ^ user.cpp:11:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tribute.out","w",stdout); ^ user.cpp:12:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&lin,&col); ^ user.cpp:15:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&vcc[i].x,&vcc[i].y); ^