Compilare: user.cpp: In function ‘int main()’: user.cpp:26:27: warning: format ‘%lld’ expects argument of type ‘long long int’, but argument 3 has type ‘int’ [-Wformat=] fprintf(fo,"%lld", ans); ^ user.cpp:16:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d%lf", &n, &k, &r); ^ user.cpp:17:66: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i = 1; i <= n; i++) fscanf(fi,"%lf", &v[i]), d[i] = 1; ^