Compilare: main.cpp: In function 'void join(Node*, Node*)': main.cpp:32:31: warning: 'b_parent' may be used uninitialized [-Wmaybe-uninitialized] 32 | if(a_parent->sz<b_parent->sz) { | ~~~~~~~~~~^~ main.cpp:21:11: note: 'b_parent' was declared here 21 | Node* b_parent; | ^~~~~~~~ main.cpp:32:18: warning: 'a_parent' may be used uninitialized [-Wmaybe-uninitialized] 32 | if(a_parent->sz<b_parent->sz) { | ~~~~~~~~~~^~ main.cpp:20:11: note: 'a_parent' was declared here 20 | Node* a_parent; | ^~~~~~~~ main.cpp: In function 'bool query(Node*, Node*)': main.cpp:54:22: warning: 'a_parent' may be used uninitialized [-Wmaybe-uninitialized] 54 | return a_parent==b_parent; | ^~~~~~~~ main.cpp:40:11: note: 'a_parent' was declared here 40 | Node* a_parent; | ^~~~~~~~ main.cpp:54:22: warning: 'b_parent' may be used uninitialized [-Wmaybe-uninitialized] 54 | return a_parent==b_parent; | ^~~~~~~~ main.cpp:41:11: note: 'b_parent' was declared here 41 | Node* b_parent; | ^~~~~~~~