Compilare: user.cpp: In function ‘int BFS(int)’: user.cpp:64:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < v[x].size(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:36:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:38:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ user.cpp: In function ‘int BFS(int)’: user.cpp:74:9: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] return x; ^