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commit
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71
S2OJ/1541/1541.cpp
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71
S2OJ/1541/1541.cpp
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#include <iostream>
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#include <vector>
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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 = 305,
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M = 1e5 + 5;
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const int mod = 1e9 + 7;
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int n, m, b[N], fa[N];
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long long f[N][M];
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std::vector<int> g[N];
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bool vis[N];
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void dfs(int u) {
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std::fill_n(f[u] + 1, m + 1, 1);
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for (const int& v : g[u]) {
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dfs(v);
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for (int j = 1; j <= m + 1; j++) {
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f[u][j] = (f[u][j] * f[v][j - vis[v]]) % mod;
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}
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}
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if (u) {
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for (int i = 1; i <= m + 1; i++) {
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f[u][i] = (f[u][i] + f[u][i - 1]) % mod;
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}
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}
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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;
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for (int i = 1; i <= n; i++) {
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cin >> b[i];
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}
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for (int i = 1; i <= n; i++) {
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vis[i] = true;
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if (b[i] == -1) {
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fa[i] = 0;
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} else {
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fa[i] = b[i];
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for (int j = b[i] + 1; j < i; j++) {
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if (fa[j] <= b[i]) {
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fa[j] = i;
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vis[j] = false;
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}
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}
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}
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}
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for (int i = 1; i <= n; i++) {
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g[fa[i]].emplace_back(i);
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}
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dfs(0);
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cout << f[0][m + 1] << endl;
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return 0;
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}
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