Compilare: user.cpp: In function ‘int main()’: user.cpp:23:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &K, &N); ^ user.cpp:28:66: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &v[i].i1, &v[i].j1, &v[i].i2, &v[i].j2); ^