Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:26:29: 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:33:29: 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 ‘void CTC()’: user.cpp:61:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[i].size();++j) if(comp[v[i][j]] != comp[i]) G[comp[i]][comp[v[i][j]]] = true; ^ user.cpp: In function ‘int main()’: user.cpp:96:9: warning: unused variable ‘i’ [-Wunused-variable] int i,j,k,a,b; ^ user.cpp:96:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,k,a,b; ^ user.cpp:96:13: warning: unused variable ‘k’ [-Wunused-variable] int i,j,k,a,b; ^