Compilare: main.cpp: In function 'void dfs(int, std::stack<int>&, std::vector<std::vector<int> >&)': main.cpp:24:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < adj[nod].size(); i++) { ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:78:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < rez.size(); i++) { ~~^~~~~~~~~~~~ main.cpp:81:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < el.size(); j++) { ~~^~~~~~~~~~~