Compilare: user.cpp: In function ‘void dfs(int, int, int)’: user.cpp:18:97: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] void dfs (int k, int dad, int lvl){niv[k] = l[k] = lvl;viz[k] = 1;for (int i = 0; i < v[k].size(); i++){if (v[k][i] == dad)continue;if (viz[v[k][i]] == 0){stiva.push(v[k][i]);dfs(v[k][i], k, lvl + 1);l[k] = min (l[k], l[v[k][i]]);if (op[v[k][i]] == 1)op[k] = 1;if (l[v[k][i]] >= niv[k]){ ^ user.cpp: In function ‘bool backoff(int, int, int, int)’: user.cpp:25:175: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] viz[nod] = 1;if (k > 1)sol.push_back(nod);if (k == k_maxi){if (nod == stop || stop == 0)return true;viz[nod] = 0;sol.pop_back();return false;}for (int i = 0; i < v[nod].size(); i++)if((v[nod][i]!=stop||k==k_maxi-1)&&viz[v[nod][i]]==0&&backoff(k + 1, k_maxi, v[nod][i], stop) == true)return true;viz[nod] = 0;sol.pop_back();return false;} ^ user.cpp: In function ‘void what(std::vector<int>&, int, int)’: user.cpp:28:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] {for (int i = 0 ; i < g.size(); i++){viz[g[i]] = 0; ^ user.cpp: In function ‘int main()’: user.cpp:37:93: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] starts[0] = q;starts[starts.size() - 1] = 0;sol.push_back(q);for (int i = 1 ; i < comp.size() && kill == 0; i++)what(comp[i], starts[i - 1], starts[i]); ^ user.cpp:38:106: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (kill == 1) {cout << "No chance\n";return 0;}cout << sol.size() << "\n";for (int i = 0 ; i < sol.size(); i++)cout << sol[i] << " " ;return 0;} ^