Compilare: user.c:8:1: warning: useless storage class specifier in empty declaration [enabled by default] }; ^ user.c: In function ‘main’: user.c:69:10: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen ("bfs.in", "r", stdin) ; ^ user.c:70:10: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen ("bfs.out", "w", stdout) ; ^ user.c:72:8: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d %d", &n, &m, &source) ; ^ user.c:75:9: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &x, &y) ; ^