Compilare: user.cpp: In function ‘int main()’: user.cpp:29:32: warning: variable ‘i_2’ set but not used [-Wunused-but-set-variable] int i,o; long long i_1,j_1,i_2,j_2,i_3,j_3,i_4,j_4,i_min,i_max,j_min,j_max,A; ^ user.cpp:29:48: warning: variable ‘i_4’ set but not used [-Wunused-but-set-variable] int i,o; long long i_1,j_1,i_2,j_2,i_3,j_3,i_4,j_4,i_min,i_max,j_min,j_max,A; ^ user.cpp:26:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cabana2.in", "r", stdin); ^ user.cpp:27:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cabana2.out", "w", stdout); ^ user.cpp:31:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&N); ^ user.cpp:33:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {scanf("%lld %lld",&v[i].x,&v[i].y); v1[i].x=v[i].x; v1[i].y=v[i].y;} ^