Compilare: user.cpp: In function ‘int main()’: user.cpp:39:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < G[x].Adj.size(); i++){ ^ user.cpp:20:9: warning: unused variable ‘j’ [-Wunused-variable] int i, j, x, y; ^ user.cpp:22:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bfs.in", "r", stdin); ^ user.cpp:23:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bfs.out", "w", stdout); ^