150 lines
2.8 KiB
C++
150 lines
2.8 KiB
C++
/* Problem URL: https://codeforces.com/problemset/problem/1999/F */
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#include <bits/stdc++.h>
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#include <ext/pb_ds/assoc_container.hpp>
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#include <ext/pb_ds/tree_policy.hpp>
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using namespace std;
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using namespace __gnu_pbds;
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template <class T, class comp = less<>>
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using ordered_set = tree<T, null_type , comp , rb_tree_tag , tree_order_statistics_node_update>;
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#define V vector
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#define rmin(a, b) a = min(a, b)
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#define rmax(a, b) a = max(a, b)
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#define rep(i, lim) for (int i = 0; i < (lim); i++)
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#define nrep(i, s, lim) for (int i = s; i < (lim); i++)
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#define repv(i, v) for (auto &i : (v))
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#define fillv(v) for (auto &itr_ : (v)) { cin >> itr_; }
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#define sortv(v) sort(v.begin(), v.end())
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#define all(v) (v).begin(), (v).end()
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using vi = vector<int>;
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using vvi = vector<vi>;
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using vvvi = vector<vvi>;
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using vvvvi = vector<vvvi>;
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using ll = long long;
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using vl = vector<ll>;
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using vvl = vector<vl>;
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using vvvl = vector<vvl>;
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using vvvvl = vector<vvvl>;
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template<class v>
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auto operator<<(ostream &os, const vector<v> &vec)->ostream& {
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os << vec[0];
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for (size_t i = 1; i < vec.size(); i++) {
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os << ' ' << vec[i];
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}
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os << '\n';
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return os;
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}
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template<class v>
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auto operator>>(istream &is, vector<v> &vec)->istream& {
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for (auto &i : vec) {
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is >> i;
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}
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return is;
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}
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template<class v>
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auto operator<<(ostream &os, const vector<vector<v>> &vec)->ostream& {
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for (auto &i : vec) {
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os << i[0];
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for (size_t j = 1; j < i.size(); j++) {
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os << ' ' << i[j];
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}
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os << '\n';
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}
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return os;
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}
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template<class v>
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auto operator>>(istream &is, vector<vector<v>> &vec)->istream& {
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for (auto &i : vec) {
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for (auto &j : i) {
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is >> j;
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}
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}
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return is;
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}
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const int oo = INT32_MAX >> 1;
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const ll OO = INT64_MAX >> 1;
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const ll mod = 1e9 + 7;
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constexpr int MAXN = 2e5 + 10;
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ll fact[MAXN];
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ll inv[MAXN];
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ll invf[MAXN];
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void pre()
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{
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fact[0] = 1;
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nrep(i, 1, MAXN) {
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fact[i] = fact[i - 1] * i % mod;
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}
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inv[1] = 1;
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nrep(i, 2, MAXN) {
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inv[i] = (mod - mod / i) * inv[mod % i] % mod;
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}
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invf[0] = 1;
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nrep(i, 1, MAXN) {
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invf[i] = invf[i - 1] * inv[i] % mod;
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}
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}
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ll comb(ll n, ll k) {
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return fact[n] * invf[k] % mod * invf[n - k] % mod;
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}
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#define TEST 1
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void solve()
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{
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int n, k;
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cin >> n >> k;
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vi a(n);
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cin >> a;
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ll c0 = count(all(a), 0);
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ll c1 = count(all(a), 1);
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ll ans = 0;
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nrep(i, (k + 1) >> 1, k + 1) {
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ll o = i;
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ll z = k - i;
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if (c0 < z || c1 < o) {
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continue;
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}
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(ans += comb(c1, o) * comb(c0, z) % mod) %= mod;
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}
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cout << ans << '\n';
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}
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int main()
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{
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ios::sync_with_stdio(false);
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cin.tie(nullptr);
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pre();
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int t;
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(TEST && cin >> t) || (t = 1);
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while (t--) {
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solve();
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}
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}
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