Compilare: user.cpp: In constructor ‘Vertex::Vertex(int)’: user.cpp:15:63: warning: converting to non-pointer type ‘int’ from NULL [-Wconversion-null] Vertex(int val) { name = val; distance = INT32_MAX; previous = NULL; } ^ user.cpp: In member function ‘void Vertex::init(int)’: user.cpp:16:66: warning: converting to non-pointer type ‘int’ from NULL [-Wconversion-null] void init(int val) { name = val; distance = INT32_MAX; previous = NULL; } ^ user.cpp: In function ‘int main()’: user.cpp:46:18: warning: converting to non-pointer type ‘int’ from NULL [-Wconversion-null] V[src].previous = NULL; ^ user.cpp:28:9: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^