Compilare: user.cpp: In function ‘void qsort(int, int)’: user.cpp:20:47: warning: operation on ‘a[j]’ may be undefined [-Wsequence-point] a[i] = a[i] + a[j] - (a[j] = a[i]); ^ user.cpp:21:47: warning: operation on ‘c[j]’ may be undefined [-Wsequence-point] c[i] = c[i] + c[j] - (c[j] = c[i]); ^ user.cpp: In function ‘void insereaza(int)’: user.cpp:45:74: warning: operation on ‘heap[tata]’ may be undefined [-Wsequence-point] heap[fiu] = heap[fiu] + heap[tata] - (heap[tata] = heap[fiu]); ^ user.cpp: In function ‘void reconstr()’: user.cpp:69:74: warning: operation on ‘heap[tata]’ may be undefined [-Wsequence-point] heap[fiu] = heap[fiu] + heap[tata] - (heap[tata] = heap[fiu]); ^