Compilare: user.cpp: In function ‘int main()’: user.cpp:37:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( 2*(S.size()-j)+1 < 2*j ) ^ user.cpp:61:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<sol.size();++i) ^ user.cpp:73:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<sol.size();++i) for(j=1;j<=nrsol[i];++j) g<<sol[i]; ^ user.cpp:22:13: warning: unused variable ‘val’ [-Wunused-variable] int i,j,val; ^