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#1738. 【2022.11.7 NOIP 模拟赛】序列(sequence)
https://sjzezoj.com/submission/63900
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108
S2OJ/1738/1738.cpp
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S2OJ/1738/1738.cpp
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#include <iostream>
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#include <algorithm>
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#include <cstring>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 1e6 + 5,
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K = 105;
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const int mod = 1e9 + 7;
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int n, k, a[N];
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long long m, f[N], s, ans;
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std::pair<long long, int> sum[N];
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class Matrix {
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private:
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long long data[K][K];
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public:
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Matrix() {
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memset(data, 0x00, sizeof(data));
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};
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void build() {
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for (int i = 1; i <= k; i++) data[i][i] = 1;
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}
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long long *operator[](int x) {
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return data[x];
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}
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Matrix operator*(Matrix b) {
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Matrix res;
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for (int i = 1; i <= k; i++) {
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for (int j = 1; j <= k; j++) {
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for (int l = 1; l <= k; l++) {
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res[i][j] = (res[i][j] + data[i][l] * b[l][j]) % mod;
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}
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}
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}
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return res;
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}
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} z, res;
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Matrix binpow(Matrix a, long long b) {
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Matrix res;
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res.build();
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while (b) {
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if (b & 1) res = res * a;
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a = a * a;
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b >>= 1;
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}
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return res;
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}
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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cin >> n >> m >> k;
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for (int i = 1; i <= n; i++) {
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cin >> a[i];
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}
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for (int i = 1; i <= n; i++) {
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f[i] = (s + 1) % mod;
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s = ((s - sum[a[i]].first) % mod + mod) % mod;
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sum[a[i]].first = f[i];
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s = (s + sum[a[i]].first) % mod;
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sum[a[i]].second = i;
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}
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std::sort(sum + 1, sum + 1 + k, [&](auto a, auto b) -> bool { return a.second < b.second; });
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for (int i = 1; i <= k; i++) {
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res[1][i] = sum[i].first;
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}
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res[1][k + 1] = s;
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res[1][k + 2] = 1;
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for (int i = 1; i < k; i++) {
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z[i + 1][i] = 1;
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}
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z[1][k + 1] = mod - 1;
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z[k + 1][k] = 1;
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z[k + 1][k + 1] = 2;
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z[k + 2][k] = 1;
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z[k + 2][k + 1] = 1;
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z[k + 2][k + 2] = 1;
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k += 2;
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res = res * binpow(z, m);
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cout << res[1][k - 1] << endl;
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return 0;
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}
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