Compilare: user.cpp: In function ‘int main()’: user.cpp:77:9: warning: unused variable ‘i’ [-Wunused-variable] int i,cate=0,nod; ^ user.cpp:77:11: warning: unused variable ‘cate’ [-Wunused-variable] int i,cate=0,nod; ^ user.cpp:77:18: warning: unused variable ‘nod’ [-Wunused-variable] int i,cate=0,nod; ^ user.cpp:78:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("domino.in","r",stdin); ^ user.cpp:79:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("domino.out","w",stdout); ^