Compilare: main.cpp: In constructor 'DataStruct::Nod2::Nod2()': main.cpp:123:14: warning: converting to non-pointer type 'int' from NULL [-Wconversion-null] st = dr = NULL; ^~~~ main.cpp: In constructor 'DataStruct::Nod1::Nod1()': main.cpp:131:14: warning: converting to non-pointer type 'int' from NULL [-Wconversion-null] st = dr = NULL; ^~~~ main.cpp:132:10: warning: converting to non-pointer type 'int' from NULL [-Wconversion-null] pom = NULL; } }; ^~~~ main.cpp: In member function 'int DataStruct::update2(int, int, int)': main.cpp:142:14: warning: NULL used in arithmetic [-Wpointer-arith] if (nod == NULL) { ^~~~ main.cpp: In member function 'int DataStruct::update1(int, int, int)': main.cpp:163:14: warning: NULL used in arithmetic [-Wpointer-arith] if (nod == NULL) { ^~~~ main.cpp: In member function 'mod DataStruct::query2(int, int, int)': main.cpp:193:14: warning: NULL used in arithmetic [-Wpointer-arith] if (nod == NULL) ^~~~ main.cpp: In member function 'mod DataStruct::query1(int, int, int)': main.cpp:205:14: warning: NULL used in arithmetic [-Wpointer-arith] if (nod == NULL) ^~~~