Compilare: user.cpp: In member function ‘int Mare::zero()’: user.cpp:229:35: 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:426:59: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if ( !C.zero () || i == 3 + ( X[0] % 2 == 0 ) && AUX ) { ^ user.cpp: In function ‘int main()’: user.cpp:452:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sg1.in", "r", stdin); ^ user.cpp:453:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sg1.out", "w", stdout); ^ user.cpp:456:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &N, &K, &least, &most); ^