Compilare: user.cpp: In function ‘void BFS(int)’: user.cpp:44:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < L[k].size(); i++) ^ user.cpp: In function ‘void read()’: user.cpp:13:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:17:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &p1, &p2); ^ user.cpp: In function ‘int main()’: user.cpp:91:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("darb.in", "r", stdin); ^ user.cpp:92:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("darb.out", "w", stdout); ^ user.cpp: In function ‘void solve()’: user.cpp:74:11: warning: ‘m’ may be used uninitialized in this function [-Wmaybe-uninitialized] BFS(m); ^