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:29:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<L[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp:32:13: warning: unused variable 'cost' [-Wunused-variable] int cost = L[nod][i].cost; ^~~~