Compilare: user.cpp: In function ‘bool Check(int)’: user.cpp:64:9: warning: variable ‘x’ set but not used [-Wunused-but-set-variable] int x,x11,x12,y11,y12,y; ^ user.cpp: In function ‘int main()’: user.cpp:140:13: warning: unused variable ‘x’ [-Wunused-variable] int x=v[i].x; ^ user.cpp:141:13: warning: unused variable ‘y’ [-Wunused-variable] int y=v[i].y; ^ user.cpp:146:9: warning: unused variable ‘st’ [-Wunused-variable] int st=0; ^ user.cpp:147:10: warning: unused variable ‘dr’ [-Wunused-variable] int dr=n; ^ user.cpp: In function ‘void read(int&)’: user.cpp:24:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,dim,stdin); ^ user.cpp:34:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,dim,stdin); ^ user.cpp: In function ‘int main()’: user.cpp:114:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("robotics.in","r",stdin); ^ user.cpp:115:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("robotics.out","w",stdout); ^ user.cpp:116:28: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,dim,stdin); ^