Compilare: main.cpp: In function 'int main()': main.cpp:48:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%lld%d",&n,&k); ^ main.cpp:50:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&a,&b); ^ main.cpp:68:12: warning: 'node' may be used uninitialized in this function [-Wmaybe-uninitialized] dfs(node); ^