Add more stuff

Educational Codeforces Round 143 (Rated for Div. 2)/D. Triangle Coloring.cpp

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+/* Problem URL: https://codeforces.com/problemset/problem/1795/D */
+
+#include <bits/stdc++.h>
+#include <ext/pb_ds/assoc_container.hpp>
+#include <ext/pb_ds/tree_policy.hpp>
+
+using namespace std;
+using namespace __gnu_pbds;
+
+template <class T, class comp = less<>>
+using ordered_set = tree<T, null_type , comp , rb_tree_tag , tree_order_statistics_node_update>;
+
+#define V vector
+
+#define rmin(a, b) a = min(a, b)
+#define rmax(a, b) a = max(a, b)
+
+#define rep(i, lim) for (int i = 0; i < (lim); i++)
+#define nrep(i, s, lim) for (int i = s; i < (lim); i++)
+
+#define repv(i, v) for (auto &i : (v))
+#define fillv(v) for (auto &itr_ : (v)) { cin >> itr_; }
+#define sortv(v) sort(v.begin(), v.end())
+#define all(v) (v).begin(), (v).end()
+
+using vi = vector<int>;
+using vvi = vector<vi>;
+using vvvi = vector<vvi>;
+using vvvvi = vector<vvvi>;
+
+using ll = long long;
+
+using vl = vector<ll>;
+using vvl = vector<vl>;
+using vvvl = vector<vvl>;
+using vvvvl = vector<vvvl>;
+
+template<class v>
+auto operator<<(ostream &os, const vector<v> &vec)->ostream& {
+    os << vec[0];
+    for (size_t i = 1; i < vec.size(); i++) {
+        os << ' ' << vec[i];
+    }
+    os << '\n';
+    return os;
+}
+
+template<class v>
+auto operator>>(istream &is, vector<v> &vec)->istream& {
+    for (auto &i : vec) {
+        is >> i;
+    }
+    return is;
+}
+
+template<class v>
+auto operator<<(ostream &os, const vector<vector<v>> &vec)->ostream& {
+    for (auto &i : vec) {
+        os << i[0];
+        for (size_t j = 1; j < i.size(); j++) {
+            os << ' ' << i[j];
+        }
+        os << '\n';
+    }
+    return os;
+}
+
+template<class v>
+auto operator>>(istream  &is, vector<vector<v>> &vec)->istream& {
+    for (auto &i : vec) {
+        for (auto &j : i) {
+            is >> j;
+        }
+    }
+    return is;
+}
+
+const int oo = INT32_MAX >> 1;
+const ll OO = INT64_MAX >> 1;
+
+
+void pre()
+{
+
+}
+
+#define TEST 0
+
+void solve()
+{
+    int n;
+    cin >> n;
+    vl a(n);
+    cin >> a;
+
+    const ll mod = 998244353;
+    ll mul = 1;
+    for (int i = 0; i < n; i += 3) {
+        ll ma = *max_element(a.begin() + i, a.begin() + i + 3);
+        ll mi = *min_element(a.begin() + i, a.begin() + i + 3);
+
+        int ca = count(a.begin() + i, a.begin() + i + 3, ma);
+        int ci = count(a.begin() + i, a.begin() + i + 3, mi);
+
+        if (ca == 3) {
+            (mul *= 3) %= mod;
+            continue;
+        }
+
+        if (ca == 2) {
+            continue;
+        }
+
+        if (ci == 2) {
+            (mul *= 2) %= mod;
+        }
+    }
+
+    auto fpow = [&](ll a, ll p) {
+        ll ans = 1;
+
+        rep(i, 61) {
+            if ((p >> i) & 1) {
+                (ans *= a) %= mod;
+            }
+            (a *= a) %= mod;
+        }
+
+        return ans;
+    };
+
+    vl fact(n + 1);
+
+    fact[0] = 1;
+    nrep(i, 1, n + 1) {
+        fact[i] = fact[i - 1] * i % mod;
+    }
+
+    n /= 3;
+    ll comb = fact[n] * fpow(fact[n / 2], mod - 2) % mod * fpow(fact[n / 2], mod - 2) % mod;
+    cout << mul * comb % mod << '\n';
+}
+
+int main()
+{
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    pre();
+
+    int t;
+    (TEST && cin >> t) || (t = 1);
+    while (t--) {
+        solve();
+    }
+}