Compilare: user.c: In function ‘main’: user.c:7:32: warning: unused variable ‘c’ [-Wunused-variable] int n,m,i,k,x,y,aux,marker,c; ^ user.c:7:25: warning: unused variable ‘marker’ [-Wunused-variable] int n,m,i,k,x,y,aux,marker,c; ^ user.c:11:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d", &n,&m); ^ user.c:18:13: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d", &vx[i],&vy[i]); ^