Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:38:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < V[x].size(); ++ i) ^ user.cpp:42:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < V[x].size() && h[nod1 = V[x][i]]; ++ i) ^ user.cpp:44:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == V[x].size() - 1) ^ user.cpp:35:9: warning: unused variable ‘i’ [-Wunused-variable] int i = 0, nod; ^ user.cpp: In function ‘void read()’: user.cpp:23:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &k); ^ user.cpp:27:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^