Compilare: user.cpp: In function ‘void bfs(int, int)’: user.cpp:38:21: warning: unused variable ‘q’ [-Wunused-variable] int q; ^ user.cpp: In function ‘int main()’: user.cpp:85:5: warning: variable ‘vec’ set but not used [-Wunused-but-set-variable] int vec[7501]; ^ user.cpp:69:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("graf.in","r",stdin); ^ user.cpp:70:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("graf.out","w",stdout); ^ user.cpp:71:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&n,&m,&n1,&n2); ^ user.cpp:75:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&v[cate].x,&v[cate].y); ^