Compilare: main.c: In function 'main': main.c:12:20: warning: format '%lld' expects argument of type 'long long int *', but argument 3 has type 'int *' [-Wformat=] fscanf( fin, "%lld", &k ); ^ main.c:12:3: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%lld", &k ); ^~~~~~~~~~~~~~~~~~~~~~~~~ main.c:25:3: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf( fout, "%lld", ans * ans ); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~