Закинул ещё мусора с Интеллекта, наверное это последнее

uts/uts_2017_aut_cpp/H.cpp

@@ -0,0 +1,72 @@
+
+////////////////////////////////////////////////////////////////////////////////////////////////
+// Andrey Odintsov
+#include <bits/stdc++.h>
+using namespace std;
+
+#define mp make_pair
+#define pb push_back
+#define FAST_IO ios_base::sync_with_stdio(false); cin.tie(0)
+#define FILE_IO(x) freopen((string(x) + ".in").c_str(), "r", stdin); freopen((string(x) + ".out").c_str(), "w", stdout)
+#define sz(x) ((int)((x).size()))
+#define len(x) ((int)((x).length()))
+#define x first
+#define y second
+#define foreach(it, v) for (auto it : v)
+#define rep(it, n) for (int it = 0; it < n; ++it)
+#define forin(it, l, r) for (int it = l; it < r; ++it)
+#define all(x) x.begin(), x.end()
+
+typedef long long ll;
+typedef unsigned long long ull;
+typedef long double ld;
+typedef pair<int, int> pii;
+typedef pair<ll, ll> pll;
+const int INF = (1 << 31) - 1;
+const ll LINF = (1ll << 63) - 1;
+const double DINF = numeric_limits<double>::infinity();
+const int MOD = 1e9 + 7;
+const double EPS = 1e-7;
+ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
+mt19937 mmtw(MOD);
+ll rnd(ll x, ll y) { static uniform_int_distribution<ll> d; return d(mmtw) % (y - x + 1) + x; }
+template <class T> T arr_max(T a[], int n) { T res = a[0]; for (int i = 1; i < n; ++i) if (a[i] > res) res = a[i]; return res; }
+template <class T> T arr_min(T a[], int n) { T res = a[0]; for (int i = 1; i < n; ++i) if (a[i] < res) res = a[i]; return res; }
+template <class T> T binpow(T n, T k) { if (k == 1) return n; if (k & 1) return binpow(n, k - 1) * n; T a = binpow(n, k / 2); return a * a; }
+template <class T> T fact(T n) { if (n == 1) return 1; return n * fact(n - 1); }
+////////////////////////////////////////////////////////////////////////////////////////////////
+
+const int MAXN = 25;
+ll n;
+ll a[MAXN];
+ll res;
+vector <ll> not_used;
+
+int main() {
+    cin >> n;
+    rep(i, n) {
+        cin >> a[i];
+    }
+
+    if (n == 1) {
+        cout << 1 << endl;
+        return 0;
+    }
+
+    for (int i = 1; i <= n; ++i) {
+        not_used.push_back(i);
+    }
+
+    ll size = fact(n - 1);
+    rep(i, n) {
+        auto it = find(all(not_used), a[i]);
+        res += size * (it - not_used.begin());
+        not_used.erase(it);
+        if (i != n - 1) {
+            size = size / (n - i - 1);
+        }
+    }
+
+    cout << res + 1 << endl;
+    return 0;
+}