Compilare: user.cpp: In function ‘void Read()’: user.cpp:31:9: warning: unused variable ‘i’ [-Wunused-variable] int i,j; ^ user.cpp:31:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^ user.cpp: In function ‘int main()’: user.cpp:96:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cobai.out","w",stdout); ^