func_code_string: #include <bits/stdc++.h>   using namespace std;   static const double EPS = 1e-9;   int ROUND(double x) { return (int)(x + 0.5); }   bool ISINT(double x) { return fabs(ROUND(x) - x) <= EPS; }   bool ISEQUAL(double x, double y) {     return fabs(x - y) <= EPS * max(1.0, max(fabs(x), fabs(y)));   }   double SQSUM(double x, double y) { return x * x + y * y; }   template <class T>   bool INRANGE(T x, T a, T b) {     return a <= x && x <= b;   }   long long get(long long tmp) {     long long a = 0;     long long b = 0;     long long base = 1;     while (tmp) {       a += base * (tmp % 10);       b += base * (9 - (tmp % 10));       tmp /= 10;       base *= 10;     }     long long c = a * b;     return c;   }   int main() {     int tmp1, tmp2;     scanf( %d %d  , &tmp1, &tmp2);     long long l = tmp1, r = tmp2;     vector<long long> res;     res.push_back(get(l));     res.push_back(get(r));     for (long long i = 5; i <= r; i *= 10) {       if (INRANGE(i, l, r)) {         res.push_back(get(i));       }     }     sort(res.rbegin(), res.rend());     cout << res[0] << endl;   }   