Compilare: main.c: In function 'main': main.c:36:24: warning: implicit declaration of function 'malloc' [-Wimplicit-function-declaration] edge[i]=(int *)malloc((deg[i]+1)*sizeof(int)); ^~~~~~ main.c:36:24: warning: incompatible implicit declaration of built-in function 'malloc' main.c:36:24: note: include '<stdlib.h>' or provide a declaration of 'malloc' main.c:24:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("bfs.in","r",stdin); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:25:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("bfs.out","w",stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:27:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&n,&m,&s); ^~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:30:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^~~~~~~~~~~~~~~~~~~~ main.c:40:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&n,&m,&s),s--; ^~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:43:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^~~~~~~~~~~~~~~~~~~~