Compilare: user.cpp: In function ‘int main(int, char**)’: user.cpp:16:46: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘ull {aka long long int}’ [-Wformat=] fprintf(o,"%ld\n",(ull)pow(res,2) - res + 1) ; ^ user.cpp:11:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(i,"%d\n",&T); ^ user.cpp:13:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(i,"%d %d\n",&N, &R); ^