Eroare de compilare: user.c: In function ‘A’: user.c:15:10: error: ‘C’ undeclared (first use in this function) a[1][0]=C[0].k=x=u=0,d[1][0]=C[0].i=1,z=30000; ^ user.c:15:10: note: each undeclared identifier is reported only once for each function it appears in user.c:15:22: warning: left-hand operand of comma expression has no effect [-Wunused-value] a[1][0]=C[0].k=x=u=0,d[1][0]=C[0].i=1,z=30000; ^ user.c:15:39: warning: left-hand operand of comma expression has no effect [-Wunused-value] a[1][0]=C[0].k=x=u=0,d[1][0]=C[0].i=1,z=30000; ^ user.c:17:11: warning: left-hand operand of comma expression has no effect [-Wunused-value] i=C[x].i,k=C[x++].k; ^ user.c:29:45: warning: left-hand operand of comma expression has no effect [-Wunused-value] d[j][q]=1,C[++u].i=j,C[u].k=q; ^ user.c: In function ‘main’: user.c:48:2: error: ‘C’ undeclared (first use in this function) C=(E*)malloc(50000*sizeof(E)); ^ user.c:37:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("lanterna.in","r",stdin),freopen("lanterna.out","w",stdout),scanf("%d%d",&n,&k); ^ user.c:37:42: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("lanterna.in","r",stdin),freopen("lanterna.out","w",stdout),scanf("%d%d",&n,&k); ^ user.c:37:75: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("lanterna.in","r",stdin),freopen("lanterna.out","w",stdout),scanf("%d%d",&n,&k); ^ user.c:39:12: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",e+i); ^ user.c:40:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&m); ^ user.c:45:12: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&i,&j),scanf("%d%d",&t[i][j],&w[i][j]),t[j][i]=t[i][j],w[j][i]=w[i][j]; ^ user.c:45:32: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&i,&j),scanf("%d%d",&t[i][j],&w[i][j]),t[j][i]=t[i][j],w[j][i]=w[i][j]; ^