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  1. #include <bits/stdc++.h>
  2. #define ll long long
  3. #define ld long double
  4. #define nl "\n"
  5. #define OO 0x3f3f3f3f
  6. using namespace std;
  7. void ta2to2a()
  8. {
  9.     ios_base::sync_with_stdio(false), cout.tie(nullptr), cin.tie(nullptr);
  10. #ifndef ONLINE_JUDGE
  11.     freopen("input.txt", "r", stdin);
  12.     freopen("output.txt", "w", stdout);
  13. #endif
  14. }
  15. int n;
  16. ll shichiGoSan(ll num, bool three, bool five, bool seven)
  17. {
  18.     ll ans = 0;
  19.     if (num > n)
  20.     {
  21.         return 0;
  22.     }
  23.     else if (num <= n && three && five && seven)
  24.     {
  25.         return 1;
  26.     }
  27.     ans += shichiGoSan(num * 10 + 3, true, five, seven) + shichiGoSan(num * 10 + 5, three, true, seven) + shichiGoSan(num * 10 + 7, three, five, true);
  28.     return ans;
  29. }
  30. void solve()
  31. {
  32.     cin >> n;
  33.     cout << shichiGoSan(0, false, false, false);
  34. }
  35. int main()
  36. {
  37.     ta2to2a();
  38.     int t = 1;
  39.     // cin >> t;
  40.     while (t--)
  41.     {
  42.         solve();
  43.     }
  44. }
Success #stdin #stdout 0.01s 5316KB
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https://ideone.com/qfOTJD
language:
C++14 (gcc 8.3)
created:
3 hours ago
visibility:
public

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