Compilare: user.cpp: In function ‘int main()’: user.cpp:51:44: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘long long unsigned int’ [-Wformat=] fprintf(g,"%ld\n",d[b[i]]-d[a[i]-1]); ^ user.cpp:36:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:38:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] { fscanf(f,"%d %d",&a[i],&b[i]); ^