Compilare: user.cpp: In function ‘void up(int)’: user.cpp:18:68: warning: operation on ‘heap[nod]’ may be undefined [-Wsequence-point] heap[nod/2] = heap[nod/2] ^ heap[nod] ^ (heap[nod] = heap[nod/2]); ^ user.cpp: In function ‘void down(int)’: user.cpp:32:65: warning: operation on ‘heap[nod]’ may be undefined [-Wsequence-point] heap[best] = heap[best] ^ heap[nod] ^ (heap[nod] = heap[best]); ^