Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:38:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < V[x].size(); ++ j) ^ user.cpp: In function ‘void read()’: user.cpp:21:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &S, &k); ^ user.cpp:23:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &r[i]); ^ 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); ^