Compilare: main.cpp: In function 'int solve()': main.cpp:20:17: warning: unused variable 'x' [-Wunused-variable] int x = v[i], y = v[j]; ^ main.cpp:20:27: warning: unused variable 'y' [-Wunused-variable] int x = v[i], y = v[j]; ^ main.cpp: In function 'void dfs(int, int)': main.cpp:28:19: 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++){ ~^~~~~~~~~~~~~~