Compilare: user.cpp: In function ‘void query(int, int, int, int, int)’: user.cpp:115:8: warning: unused variable ‘son1’ [-Wunused-variable] ST son1 = {0, 0, 0, 0}, son2 = {0, 0, 0, 0}; ^ user.cpp:115:29: warning: unused variable ‘son2’ [-Wunused-variable] ST son1 = {0, 0, 0, 0}, son2 = {0, 0, 0, 0}; ^ user.cpp: In function ‘void readNum(int&)’: user.cpp:124:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ user.cpp: In function ‘int main()’: user.cpp:145:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^