Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:47:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ( ic < C.size()) ^ user.cpp:50:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < V[x].size(); i++) ^ user.cpp: In function ‘void citire()’: user.cpp:33:34: 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:34:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &m, &s); ^ user.cpp:37:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d %d", &x , &y) ; ^