Compilare: user.cpp: In function ‘node* delete_node(node*, int)’: user.cpp:107:17: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation] for(t = n->r ; t->l != NIL; t = t->l); ^~~ user.cpp:108:21: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘for’ n->key = t->key; ^