Compilare: user.cpp: In function ‘void del(int)’: user.cpp:67:39: warning: operation on ‘x’ may be undefined [-Wsequence-point] pos[heap[father(x)]] = x = father(x); ^ user.cpp:78:37: warning: operation on ‘x’ may be undefined [-Wsequence-point] pos[heap[left(x)]] = x = left(x); ^ user.cpp:84:39: warning: operation on ‘x’ may be undefined [-Wsequence-point] pos[heap[right(x)]] = x = right(x); ^ user.cpp:91:36: warning: operation on ‘x’ may be undefined [-Wsequence-point] pos[heap[left(x)]] = x = left(x); ^ user.cpp: In function ‘int main()’: user.cpp:17:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("heapuri.in", "r", stdin); ^ user.cpp:18:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("heapuri.out", "w", stdout); ^ user.cpp:20:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ", &m); ^ user.cpp:22:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ user.cpp:26:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a); ^ user.cpp:30:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a); ^