Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:19:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<L[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp:35:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<L[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp:48:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<L[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:135:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<3*chains[i].size();j++) ~^~~~~~~~~~~~~~~~~~~