Compilare: user.cpp: In function ‘int main()’: user.cpp:10:9: warning: unused variable ‘T’ [-Wunused-variable] int T; ^ user.cpp:11:10: warning: unused variable ‘a’ [-Wunused-variable] char a, b; ^ user.cpp:11:13: warning: unused variable ‘b’ [-Wunused-variable] char a, b; ^ user.cpp:13:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "staropramen.in", "r", stdin ); ^ user.cpp:14:47: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "staropramen.out", "w", stdout ); ^