Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:33:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[node].size(); ++i) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void read()': main.cpp:61:9: warning: unused variable 'x' [-Wunused-variable] int x, y; ^ main.cpp:61:12: warning: unused variable 'y' [-Wunused-variable] int x, y; ^