func_code_string: #include <bits/stdc++.h>   using namespace std;   using ll = long long;   ll A[19], cnt, dp[19][4][3][2][2][504][2];   const int p3[]{1, 3, 9};   ll dfs(int pos, int level2, int level3, int level5, int level7, int sum,          bool limit) {     ll ans = 0;     if (dp[pos][level2][level3][level5][level7][sum][limit] != -1)       return dp[pos][level2][level3][level5][level7][sum][limit];     for (int v = 0; v <= (limit ? A[pos] : 9); ++v) {       int l2 = level2, l3 = level3, l5 = level5, l7 = level7;       int cur = (sum * 10 + v) % 504;       if (v == 2) l2 = max(l2, 1);       if (v == 3) l3 = max(l3, 1);       if (v == 4) l2 = max(l2, 2);       if (v == 5) l5 = 1;       if (v == 6) l2 = max(l2, 1), l3 = max(l3, 1);       if (v == 7) l7 = 1;       if (v == 8) l2 = 3;       if (v == 9) l3 = 2;       if (pos == cnt - 1)         ans += cur % (1 << l2) == 0 && cur % p3[l3] == 0 &&                cur % (l7 ? 7 : 1) == 0 && (!l5 || v == 5 || v == 0);       else         ans += dfs(pos + 1, l2, l3, l5, l7, cur, limit && v == A[pos]);     }     if (!limit) dp[pos][level2][level3][level5][level7][sum][limit] = ans;     return ans;   }   ll f(ll x) {     if (x == 0) return 1;     cnt = 0;     while (x) A[cnt++] = x % 10, x /= 10;     reverse(A, A + cnt);     memset(dp, -1, sizeof(dp));     return dfs(0, 0, 0, 0, 0, 0, true);   }   int main() {     ios::sync_with_stdio(false);     int t;     cin >> t;     while (t--) {       ll x, y;       cin >> x >> y;       ll l = f(x - 1), r = f(y);       cout << r - l <<   n ;     }     return 0;   }   