Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:17:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<L[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp:33:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<L[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp:46:23: 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:137:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<=2*chains[i].size();j++) ~^~~~~~~~~~~~~~~~~~~~