Compilare: user.cpp: In function ‘void solve(int&, int&, int&)’: user.cpp:11:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( ;j<s.size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:70:17: warning: unused variable ‘aux’ [-Wunused-variable] int i,j,nra,aux,nrb,coefa,coefb,tip,n; ^ user.cpp:70:37: warning: unused variable ‘tip’ [-Wunused-variable] int i,j,nra,aux,nrb,coefa,coefb,tip,n; ^