Compilare: user.cpp: In function ‘int main()’: user.cpp:82:67: warning: format ‘%d’ expects argument of type ‘int’, but argument 4 has type ‘long long int’ [-Wformat=] fprintf(fout, "%lld %d\n", (N - len * (len - 1) / 2) / len, len); ^ user.cpp:37:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &N); ^