Compilare: user.cpp: In member function ‘int Mare::zero()’: user.cpp:303:35: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] return A[0] == 0 || A[0] == 1 && A[1] == 0 ; ^ user.cpp: In member function ‘void Mare::radical_normal(Mare&, int)’: user.cpp:498:59: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if ( !C.zero () || i == 3 + ( X[0] % 2 == 0 ) && AUX ) { ^ user.cpp: In function ‘int main()’: user.cpp:562:20: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] FIN("hanoi.in"); ^ user.cpp:563:22: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] FOUT("hanoi.out"); ^