Compilare: main.cpp: In function 'int main()': main.cpp:71:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &K); ^ main.cpp:77:66: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &r.c1[0], &r.c1[1], &r.c2[0], &r.c2[1]); ^