Compilare: user.c: In function ‘D’: user.c:12:3: warning: implicit declaration of function ‘memcpy’ [-Wimplicit-function-declaration] l[o]=++h,d[h]=1,memcpy(pu,p[h],p[h][0]),pu[++p[h][0]]=o,p[h]=(int*)realloc(p[h],sizeof(int)*(p[h][0]+1)),memcpy(p[h],pu,p[h][0]); ^ user.c:12:19: warning: incompatible implicit declaration of built-in function ‘memcpy’ [enabled by default] l[o]=++h,d[h]=1,memcpy(pu,p[h],p[h][0]),pu[++p[h][0]]=o,p[h]=(int*)realloc(p[h],sizeof(int)*(p[h][0]+1)),memcpy(p[h],pu,p[h][0]); ^ user.c:15:22: warning: incompatible implicit declaration of built-in function ‘memcpy’ [enabled by default] l[o]=l[b],d[l[o]]++,memcpy(pu,p[l[o]],p[l[o]][0]),pu[++p[l[o]][0]]=o,p[l[o]]=(int*)realloc(p[l[o]],sizeof(int)*(p[l[o]][0]+1)),memcpy(p[l[o]],pu,p[l[o]][0]); ^ user.c: In function ‘main’: user.c:48:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("heavypath.in","r",stdin),freopen("heavypath.out","w",stdout),scanf("%d%d",&n,&m); ^ user.c:48:43: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("heavypath.in","r",stdin),freopen("heavypath.out","w",stdout),scanf("%d%d",&n,&m); ^ user.c:48:77: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("heavypath.in","r",stdin),freopen("heavypath.out","w",stdout),scanf("%d%d",&n,&m); ^ user.c:50:11: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",v+i); ^ user.c:52:11: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a[i],&b[i]),oi[a[i]]++,oi[b[i]]++; ^ user.c:63:8: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&t,&x,&y); ^