結果
| 問題 | No.1688 Veterinarian |
| コンテスト | |
| ユーザー |
carrot46
|
| 提出日時 | 2021-09-24 21:53:48 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 137 ms / 3,000 ms |
| コード長 | 2,710 bytes |
| コンパイル時間 | 2,132 ms |
| コンパイル使用メモリ | 199,980 KB |
| 最終ジャッジ日時 | 2025-01-24 17:09:47 |
|
ジャッジサーバーID (参考情報) |
judge5 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 14 |
ソースコード
#include <bits/stdc++.h>
#include <atcoder/modint>
using namespace atcoder;
//#pragma GCC optimize ("O3")
using namespace std;
#define reps(i,s,n) for(int i = s; i < n; i++)
#define rep(i,n) reps(i,0,n)
#define Rreps(i,n,e) for(int i = n - 1; i >= e; --i)
#define Rrep(i,n) Rreps(i,n,0)
#define ALL(a) a.begin(), a.end()
using ll = long long;
using vec = vector<ll>;
using mat = vector<vec>;
ll N,M,H,W,Q,K,A,B;
string S;
using P = pair<ll, ll>;
using tp = tuple<ll, ll, ll>;
const ll INF = (1LL<<60);
template<class T> bool chmin(T &a, const T b){
if(a > b) {a = b; return true;}
else return false;
}
template<class T> bool chmax(T &a, const T b){
if(a < b) {a = b; return true;}
else return false;
}
template<class T> void my_printv(std::vector<T> v,bool endline = true){
if(!v.empty()){
for(std::size_t i{}; i<v.size()-1; ++i) std::cout<<v[i]<<" ";
std::cout<<v.back();
}
if(endline) std::cout<<std::endl;
}
using mint = modint998244353;
using vm = vector<mint>;
int main() {
cin.tie(nullptr);
ios::sync_with_stdio(false);
ll C;
cin>>A>>B>>C>>N;
vector<tuple<double, double, double>> dp((A + 1) * (B + 1) * (C + 1) * (N + 1), {-1, -1, -1});
auto toid = [&C](int a, int b, int c, int n){
return ((a * (B + 1) + b) * (C + 1) + c) * (N + 1) + n;
};
auto add = [](tuple<double, double, double> a, tuple<double, double, double> b) -> tuple<double, double, double>{
return {get<0>(a) + get<0>(b), get<1>(a) + get<1>(b), get<2>(a) + get<2>(b)};
};
auto dfs = [&](auto &&self, int a, int b, int c, int n) -> tuple<double, double, double>{
int id = toid(a, b, c, n);
if(get<0>(dp[id]) > -1e-9) return dp[id];
auto &res = dp[id];
res = {0.0, 0.0, 0.0};
if(n == 0 || a + b + c <= 1){
res = {A - a, B - b, C - c};
}else{
int s = a + b + c;
double tot = 1.0;
rep(i, 3){
int k = a;
if(i == 1) k = b;
else if(i == 2) k = c;
if(k == 0) continue;
double p = (double)k * (k - 1) / (s * (s - 1));
tot -= p;
auto [na, nb, nc] = self(self, a - (i == 0), b - (i == 1), c - (i == 2), n - 1);
res = add(res, tuple<double, double, double>(na * p, nb * p, nc * p));
}
assert(tot >= -1e-9);
auto [na, nb, nc] = self(self, a, b, c, n - 1);
res = add(res, tuple<double, double, double>(na * tot, nb * tot, nc * tot));
}
return res;
};
auto [a, b, c] = dfs(dfs, A, B, C, N);
cout<<fixed<<setprecision(10)<<a<<' '<<b<<' '<<c<<endl;
}
carrot46