Compilare: user.cpp: In member function ‘int flipClass::do_p()’: user.cpp:48:76: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] a_total = a_total + ((((perm & (1<<i))>>i) ^ ((perm & (1<<m+j))>>m+j)) ? (-1) * matrix[i][j] : matrix[i][j]); ^ user.cpp:48:83: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] a_total = a_total + ((((perm & (1<<i))>>i) ^ ((perm & (1<<m+j))>>m+j)) ? (-1) * matrix[i][j] : matrix[i][j]); ^ user.cpp: In function ‘int main()’: user.cpp:75:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(flip.do_p()<mp); ^