Compilare: user.cpp: In function ‘void read_input()’: user.cpp:51:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &point_count, &line_count); ^ user.cpp:54:50: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &points[i].x, &points[i].y); ^ user.cpp:58:78: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &points[point_count + i].x, &points[point_count + i].y); ^