Compilare: user.cpp: In function ‘int main()’: user.cpp:54:13: warning: unused variable ‘prv’ [-Wunused-variable] int prv = 0; ^ user.cpp:38:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:40:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &v[i].l, &v[i].r); ^