Compilare: main.cpp: In function 'node* tremove(node*, int)': main.cpp:148:11: warning: unused variable 'bak' [-Wunused-variable] node *bak = root; ^~~ main.cpp: In function 'int main()': main.cpp:232:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ main.cpp:238:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ main.cpp:244:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^