結果
| 問題 |
No.1688 Veterinarian
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2021-09-25 00:25:06 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 88 ms / 3,000 ms |
| コード長 | 3,278 bytes |
| コンパイル時間 | 2,230 ms |
| コンパイル使用メモリ | 194,456 KB |
| 最終ジャッジ日時 | 2025-01-24 17:51:52 |
|
ジャッジサーバーID (参考情報) |
judge4 / 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
#pragma region Macros
#include <bits/stdc++.h>
using namespace std;
template <class T> inline bool chmax(T &a, T b) {
if(a < b) {
a = b;
return 1;
}
return 0;
}
template <class T> inline bool chmin(T &a, T b) {
if(a > b) {
a = b;
return 1;
}
return 0;
}
#ifdef DEBUG
template <class T, class U>
ostream &operator<<(ostream &os, const pair<T, U> &p) {
os << '(' << p.first << ',' << p.second << ')';
return os;
}
template <class T> ostream &operator<<(ostream &os, const vector<T> &v) {
os << '{';
for(int i = 0; i < (int)v.size(); i++) {
if(i) { os << ','; }
os << v[i];
}
os << '}';
return os;
}
void debugg() { cerr << endl; }
template <class T, class... Args>
void debugg(const T &x, const Args &... args) {
cerr << " " << x;
debugg(args...);
}
#define debug(...) \
cerr << __LINE__ << " [" << #__VA_ARGS__ << "]: ", debugg(__VA_ARGS__)
#define dump(x) cerr << __LINE__ << " " << #x << " = " << (x) << endl
#else
#define debug(...) (void(0))
#define dump(x) (void(0))
#endif
struct Setup {
Setup() {
cin.tie(0);
ios::sync_with_stdio(false);
cout << fixed << setprecision(15);
}
} __Setup;
using ll = long long;
#define ALL(v) (v).begin(), (v).end()
#define RALL(v) (v).rbegin(), (v).rend()
#define FOR(i, a, b) for(int i = (a); i < int(b); i++)
#define REP(i, n) FOR(i, 0, n)
const int INF = 1 << 30;
const ll LLINF = 1LL << 60;
constexpr int MOD = 1000000007;
const int dx[4] = {1, 0, -1, 0};
const int dy[4] = {0, 1, 0, -1};
void Case(int i) { cout << "Case #" << i << ": "; }
int popcount(int x) { return __builtin_popcount(x); }
ll popcount(ll x) { return __builtin_popcountll(x); }
#pragma endregion Macros
int A, B, C, N;
array<double, 3> memo[55][55][55][55];
bool seen[55][55][55][55];
array<double, 3> rec(int i, int a, int b, int c) {
if(seen[i][a][b][c]) return memo[i][a][b][c];
if(i == N) {
seen[i][a][b][c] = true;
return (memo[i][a][b][c] = {0.0, 0.0, 0.0});
}
array<double, 3> res = {0.0, 0.0, 0.0};
int sum = a + b + c;
double pa = (double)(a * (a-1)) / (sum * (sum-1));
double pb = (double)(b * (b-1)) / (sum * (sum-1));
double pc = (double)(c * (c-1)) / (sum * (sum-1));
double other = 1.0 - (pa + pb + pc);
// aa
if(a >= 2) {
auto tmp = rec(i+1, a-1, b, c);
res[0] += pa * (tmp[0] + 1);
res[1] += pa * tmp[1];
res[2] += pa * tmp[2];
}
// bb
if(b >= 2) {
auto tmp = rec(i+1, a, b-1, c);
res[0] += pb * tmp[0];
res[1] += pb * (tmp[1] + 1);
res[2] += pb * tmp[2];
}
// cc
if(c >= 2) {
auto tmp = rec(i+1, a, b, c-1);
res[0] += pc * tmp[0];
res[1] += pc * tmp[1];
res[2] += pc * (tmp[2] + 1);
}
// other
{
auto tmp = rec(i+1, a, b, c);
res[0] += other * tmp[0];
res[1] += other * tmp[1];
res[2] += other * tmp[2];
}
seen[i][a][b][c] = true;
return (memo[i][a][b][c] = res);
}
int main() {
cin >> A >> B >> C >> N;
auto res = rec(0, A, B, C);
cout << res[0] << " " << res[1] << " " << res[2] << "\n";
}