Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:22:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();++i) if(!viz[v[x][i]]) DFS(v[x][i]); ^ user.cpp: In function ‘void DFST(int)’: user.cpp:29:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<w[x].size();++i) if(viz[w[x][i]]) DFST(w[x][i]); ^ user.cpp: In function ‘int main()’: user.cpp:35:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,a,b; ^