Compilare: user.cpp: In function ‘void solve()’: user.cpp:35:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[s].size();++i) ^ user.cpp: In function ‘void DFSort(int)’: user.cpp:55:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[s].size();++i) if(B[v[s][i]]==0) DFSort(v[s][i]); ^ user.cpp: In function ‘int main()’: user.cpp:61:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,a,b; ^