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  1. #include<bits/stdc++.h>
  2.  
  3. #define ll long long
  4. #define pp push_back
  5. #define endl '\n'
  6. #define all(x) x.begin(),x.end()
  7. #define ld long double
  8. #define PI acos(-1)
  9. #define ones(x) __builtin_popcountll(x)
  10. //#define int ll
  11.  
  12. using namespace std;
  13.  
  14. void Drakon() {
  15.     ios_base::sync_with_stdio(false);
  16.     cin.tie(nullptr);
  17.     cout.tie(nullptr);
  18. #ifdef Clion
  19.     freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
  20. #endif
  21. }
  22.  
  23. unsigned long long inf = 1e10;
  24. const double EPS = 1e-6;
  25. const int MOD = 1000000007, N = 200005, LOG = 25;
  26.  
  27. ll mul(const ll &a, const ll &b) {
  28.     return (a % MOD + MOD) * (b % MOD + MOD) % MOD;
  29. }
  30.  
  31. ll add(const ll &a, const ll &b) {
  32.     return (a + b + 2 * MOD) % MOD;
  33. }
  34.  
  35. ll pw(ll x, ll y) {
  36.     ll ret = 1;
  37.     while (y > 0) {
  38.         if (y % 2 == 0) {
  39.             x = mul(x, x);
  40.             y = y / 2;
  41.         } else {
  42.             ret = mul(ret, x);
  43.             y = y - 1;
  44.         }
  45.     }
  46.     return ret;
  47. }
  48.  
  49. void solve() {
  50.     int n;
  51.     cin >> n;
  52.     int ans = 0;
  53.     for (int y = 1; y <= n; ++y) {
  54.         for (int z = 1; z <= n; ++z) {
  55.             if(1ll * y * z * 7 > n) break;
  56.             int rem = n - y * z * 7;
  57.             if(rem % 3 == 0) ans ++;
  58.         }
  59.     }
  60.     cout << ans;
  61. }
  62.  
  63. signed main() {
  64.     Drakon();
  65.     int t = 1;
  66.     //cin >> t;
  67.     while (t--) {
  68.         solve();
  69.     }
  70. }
Success #stdin #stdout 0s 5320KB
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https://ideone.com/DgIou6
language:
C++14 (gcc 8.3)
created:
3 days ago
visibility:
public

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