Compilare: user.cpp: In member function ‘int Hash::Find(Point)’: user.cpp:58:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<C[key].size(); i++) ^ user.cpp: In function ‘bool Test_Answer()’: user.cpp:81:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.cpp: In function ‘bool Set_Answer()’: user.cpp:122:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.cpp: In function ‘int main()’: user.cpp:152:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("overlap.in","r",stdin); ^ user.cpp:153:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("overlap.out","w",stdout); ^ user.cpp:155:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); H.init(); ^ user.cpp: In member function ‘void Point::init(int)’: user.cpp:20:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^