Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:23:29: 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:30:29: 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:56:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<sol[i].size() && ok;++j) for(k=0;k<v[sol[i][j]].size();++k) ^ user.cpp:56:72: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<sol[i].size() && ok;++j) for(k=0;k<v[sol[i][j]].size();++k) ^