Compilare: user.cpp: In function ‘int main()’: user.cpp:35:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:40:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &nodes[i].value); ^ user.cpp:47:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &a, &b); ^ user.cpp:59:14: warning: ‘root’ may be used uninitialized in this function [-Wmaybe-uninitialized] dfs(root); ^