Compilare: main.cpp: In member function 'void Btree::splitChild(Node*, int)': main.cpp:68:23: warning: comparison of integer expressions of different signedness: 'int' and 'long unsigned int' [-Wsign-compare] 68 | for (int i = t; i < 2 * t - 1; i++) | ~~^~~~~~~~~~~ main.cpp:74:27: warning: comparison of integer expressions of different signedness: 'int' and 'long unsigned int' [-Wsign-compare] 74 | for (int i = t; i < 2 * t; i++) | ~~^~~~~~~ main.cpp: In member function 'void Btree::insert_not_full(Node*, long unsigned int)': main.cpp:87:28: warning: comparison of integer expressions of different signedness: 'long unsigned int' and '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'} [-Wsign-compare] 87 | while (i >= 0 && k < node->keys[i]) main.cpp:96:28: warning: comparison of integer expressions of different signedness: 'long unsigned int' and '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'} [-Wsign-compare] 96 | while (i >= 0 && k < node->keys[i]) main.cpp:101:19: warning: comparison of integer expressions of different signedness: 'long unsigned int' and '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'} [-Wsign-compare] 101 | if (k > node->keys[i + 1]) main.cpp: In member function 'void Btree::deleteKey(Node*, int)': main.cpp:191:17: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else] 191 | else if (i + 1 == node->children.size()) | ^ main.cpp: In member function 'int Btree::delete_predecessor(Node*)': main.cpp:236:23: warning: control reaches end of non-void function [-Wreturn-type] 236 | delete_predecessor(node->children[n]); | ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'int Btree::delete_successor(Node*)': main.cpp:250:21: warning: control reaches end of non-void function [-Wreturn-type] 250 | delete_successor(node->children[0]); | ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'void Btree::delete_merge(Node*, int, int)': main.cpp:292:20: warning: 'new_node' may be used uninitialized [-Wmaybe-uninitialized] 292 | this->root = new_node; | ~~~~~~~~~~~^~~~~~~~~~ main.cpp:254:39: note: 'new_node' was declared here 254 | Node *child = node->children[i], *new_node; | ^~~~~~~~