Compilare: user.c: In function ‘fill’: user.c:6:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.c: In function ‘main’: user.c:23:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d%d%d" ,&n,&m,&Q,&t); ^ user.c:25:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d%d%d%d" ,&x1,&y1,&x2,&y2,&q); ^