Submission #873324

#TimeUsernameProblemLanguageResultExecution timeMemory
873324bobbilykingCalvinball championship (CEOI15_teams)C++17
10 / 100
271 ms1044 KiB
#pragma GCC target ("avx2") #pragma GCC optimize ("O3") #pragma GCC optimize ("unroll-loops") #include<bits/stdc++.h> #include<math.h> using namespace std; typedef long long int ll; typedef long double ld; typedef pair<ll, ll> pl; #define K first #define V second #define G(x) ll x; cin >> x; #define GD(x) ld x; cin >> x; #define GS(s) string s; cin >> s; #define EX(x) { cout << x << '\n'; exit(0); } #define A(a) (a).begin(), (a).end() #define F(i, l, r) for (ll i = (l); i < r; ++i) #define NN 10010 #define M 1000007 // 998244353 ll f[NN*2], fi[NN*2]; constexpr ll bpow(ll b, ll e) { ll r = 1; for (; e; e/=2) { if (e&1) r=r*b%M; b=b*b%M; } return r; } constexpr ll inv(ll b) { return bpow(b, M-2); } ll ncr(ll n, ll k) { if (min(n, k) < 0) return 0; if (n < k) return 0; if (n == k || k == 0) return 1; return f[n] * fi[n-k]%M * fi[k]%M; } ll dp[NN]; int main(){ // freopen("a.in", "r", stdin); // freopen("a.out", "w", stdout); ios_base::sync_with_stdio(false); cin.tie(0); cout << fixed << setprecision(20); f[0] = 1; F(i, 1, 2*NN) f[i] = f[i-1]*i%M; F(i, 0, 2*NN) fi[i] = inv(f[i]); dp[0] = 1; F(i, 1, NN) { F(k, 1, i+1) dp[i] += dp[i-k] * ncr(i-1, k-1)%M; dp[i]%=M; } // F(i, 0, 10) { // cout << i << ": " << dp[i] << endl; // } ll answer = 1; G(n) for (ll left = n; left >= 1; --left) { G(x) answer = (answer + (x-1) * dp[left])%M; } cout << answer << '\n'; }
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