Compilare: user.c: In function ‘main’: user.c:81:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &N); ^ user.c:84:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &op); ^ user.c:87:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &aux); ^ user.c:91:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &aux); ^ user.c: In function ‘heap_del’: user.c:50:21: warning: ‘itempos’ may be used uninitialized in this function [-Wmaybe-uninitialized] heap.tree[itempos] = heap.tree[heap.end--]; ^