Compilare: user.cpp: In function ‘int main()’: user.cpp:32:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( input_file, "%d %d", &N, &K ); D[1] = 1; ^ user.cpp: In function ‘long long int get_answer(long long int)’: user.cpp:19:20: warning: ‘sqr’ may be used uninitialized in this function [-Wmaybe-uninitialized] for( int i = N / sqr; i >= 1; i -- ) { ^