Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:18:21: error: ‘j’ was not declared in this scope if(a[i]==')' && a[j]=='(' )aux++; ^ user.cpp:21:12: error: ‘aux’ was not declared in this scope cout<<n/2+aux; ^ user.cpp:8:14: warning: unused variable ‘b’ [-Wunused-variable] int i=0, n, b=0; ^