結果

問題 No.2009 Drunkers' Contest
ユーザー fuppy_kyoprofuppy_kyopro
提出日時 2022-07-15 23:15:13
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 1,546 ms / 2,000 ms
コード長 7,443 bytes
コンパイル時間 3,093 ms
コンパイル使用メモリ 218,304 KB
実行使用メモリ 18,908 KB
最終ジャッジ日時 2023-09-10 04:57:48
合計ジャッジ時間 39,992 ms
ジャッジサーバーID
(参考情報)
judge12 / judge13
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 2 ms
4,380 KB
testcase_01 AC 2 ms
4,376 KB
testcase_02 AC 1 ms
4,380 KB
testcase_03 AC 2 ms
4,380 KB
testcase_04 AC 2 ms
4,380 KB
testcase_05 AC 1 ms
4,380 KB
testcase_06 AC 2 ms
4,376 KB
testcase_07 AC 2 ms
4,380 KB
testcase_08 AC 2 ms
4,380 KB
testcase_09 AC 1 ms
4,384 KB
testcase_10 AC 2 ms
4,380 KB
testcase_11 AC 1 ms
4,380 KB
testcase_12 AC 2 ms
4,376 KB
testcase_13 AC 2 ms
4,380 KB
testcase_14 AC 13 ms
4,380 KB
testcase_15 AC 13 ms
4,380 KB
testcase_16 AC 16 ms
4,380 KB
testcase_17 AC 21 ms
4,380 KB
testcase_18 AC 21 ms
4,380 KB
testcase_19 AC 23 ms
4,380 KB
testcase_20 AC 26 ms
4,380 KB
testcase_21 AC 27 ms
4,380 KB
testcase_22 AC 29 ms
4,380 KB
testcase_23 AC 30 ms
4,380 KB
testcase_24 AC 1,483 ms
18,688 KB
testcase_25 AC 1,484 ms
18,740 KB
testcase_26 AC 1,486 ms
18,816 KB
testcase_27 AC 1,491 ms
18,792 KB
testcase_28 AC 1,490 ms
18,672 KB
testcase_29 AC 1,484 ms
18,824 KB
testcase_30 AC 1,485 ms
18,676 KB
testcase_31 AC 1,492 ms
18,804 KB
testcase_32 AC 1,483 ms
18,684 KB
testcase_33 AC 1,490 ms
18,688 KB
testcase_34 AC 1,480 ms
18,908 KB
testcase_35 AC 1,481 ms
18,684 KB
testcase_36 AC 1,483 ms
18,676 KB
testcase_37 AC 1,479 ms
18,804 KB
testcase_38 AC 1,481 ms
18,664 KB
testcase_39 AC 1,476 ms
18,732 KB
testcase_40 AC 1,546 ms
18,680 KB
testcase_41 AC 1,508 ms
18,708 KB
testcase_42 AC 1,480 ms
18,796 KB
testcase_43 AC 1,484 ms
18,684 KB
testcase_44 AC 118 ms
18,628 KB
testcase_45 AC 119 ms
18,788 KB
testcase_46 AC 105 ms
18,788 KB
testcase_47 AC 98 ms
18,688 KB
testcase_48 AC 99 ms
18,744 KB
testcase_49 AC 101 ms
18,852 KB
testcase_50 AC 332 ms
18,820 KB
testcase_51 AC 99 ms
18,736 KB
testcase_52 AC 98 ms
18,712 KB
testcase_53 AC 1,136 ms
18,664 KB
testcase_54 AC 800 ms
18,664 KB
testcase_55 AC 224 ms
18,688 KB
testcase_56 AC 130 ms
18,900 KB
testcase_57 AC 108 ms
18,792 KB
権限があれば一括ダウンロードができます

ソースコード

diff #

/*
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
//*/

#include <bits/stdc++.h>

// #include <atcoder/all>

using namespace std;
// using namespace atcoder;

// #define _GLIBCXX_DEBUG

#define DEBUG(x) cerr << #x << ": " << x << endl;
#define DEBUG_VEC(v)                                        \
    cerr << #v << ":";                                      \
    for (int iiiiiiii = 0; iiiiiiii < v.size(); iiiiiiii++) \
        cerr << " " << v[iiiiiiii];                         \
    cerr << endl;
#define DEBUG_MAT(v)                                \
    cerr << #v << endl;                             \
    for (int iv = 0; iv < v.size(); iv++) {         \
        for (int jv = 0; jv < v[iv].size(); jv++) { \
            cerr << v[iv][jv] << " ";               \
        }                                           \
        cerr << endl;                               \
    }
typedef long long ll;
// #define int ll

#define vi vector<int>
#define vl vector<ll>
#define vii vector<vector<int>>
#define vll vector<vector<ll>>
#define vs vector<string>
#define pii pair<int, int>
#define pis pair<int, string>
#define psi pair<string, int>
#define pll pair<ll, ll>
template <class S, class T>
pair<S, T> operator+(const pair<S, T> &s, const pair<S, T> &t) {
    return pair<S, T>(s.first + t.first, s.second + t.second);
}
template <class S, class T>
pair<S, T> operator-(const pair<S, T> &s, const pair<S, T> &t) { return pair<S, T>(s.first - t.first, s.second - t.second); }
template <class S, class T>
ostream &operator<<(ostream &os, pair<S, T> p) {
    os << "(" << p.first << ", " << p.second << ")";
    return os;
}
#define X first
#define Y second
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rep1(i, n) for (int i = 1; i <= (int)(n); i++)
#define rrep(i, n) for (int i = (int)(n)-1; i >= 0; i--)
#define rrep1(i, n) for (int i = (int)(n); i > 0; i--)
#define REP(i, a, b) for (int i = a; i < b; i++)
#define in(x, a, b) (a <= x && x < b)
#define all(c) c.begin(), c.end()
void YES(bool t = true) {
    cout << (t ? "YES" : "NO") << endl;
}
void Yes(bool t = true) { cout << (t ? "Yes" : "No") << endl; }
void yes(bool t = true) { cout << (t ? "yes" : "no") << endl; }
void NO(bool t = true) { cout << (t ? "NO" : "YES") << endl; }
void No(bool t = true) { cout << (t ? "No" : "Yes") << endl; }
void no(bool t = true) { cout << (t ? "no" : "yes") << endl; }
template <class T>
bool chmax(T &a, const T &b) {
    if (a < b) {
        a = b;
        return 1;
    }
    return 0;
}
template <class T>
bool chmin(T &a, const T &b) {
    if (a > b) {
        a = b;
        return 1;
    }
    return 0;
}
#define UNIQUE(v) v.erase(std::unique(v.begin(), v.end()), v.end());
const ll inf = 1000000001;
const ll INF = (ll)1e18 + 1;
const long double pi = 3.1415926535897932384626433832795028841971L;
int popcount(ll t) { return __builtin_popcountll(t); }
// int dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1};
// int dx2[8] = { 1,1,0,-1,-1,-1,0,1 }, dy2[8] = { 0,1,1,1,0,-1,-1,-1 };
vi dx = {0, 0, -1, 1}, dy = {-1, 1, 0, 0};
vi dx2 = {1, 1, 0, -1, -1, -1, 0, 1}, dy2 = {0, 1, 1, 1, 0, -1, -1, -1};
struct Setup_io {
    Setup_io() {
        ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
        cout << fixed << setprecision(25);
    }
} setup_io;
const ll MOD = 1000000007;
// const ll MOD = 998244353;
// #define mp make_pair
//#define endl '\n'

template <typename T>
class SegmentTree {
  public:
    using F = function<T(T &, T &)>;
    int n;
    vector<T> dat;
    T e;
    F query_func;
    F update_func;

    SegmentTree(vector<T> a, F query_func, F update_func, T e) : n(a.size()), query_func(query_func), update_func(update_func), e(e) {
        if (n == 0) {
            a.push_back(e);
            n++;
        }
        dat.resize(4 * n);
        init(0, 0, n, a);
    }

    void init(int k, int l, int r, vector<T> &a) {
        if (r - l == 1) {
            dat[k] = a[l];
        } else {
            int lch = 2 * k + 1, rch = 2 * k + 2;
            init(lch, l, (l + r) / 2, a);
            init(rch, (l + r) / 2, r, a);
            dat[k] = query_func(dat[lch], dat[rch]);
        }
    }

    void update(int k, T a, int v, int l, int r) {
        if (r - l == 1) {
            dat[v] = update_func(dat[v], a);
        } else {
            if (k < (l + r) / 2)
                update(k, a, 2 * v + 1, l, (l + r) / 2);
            else {
                update(k, a, 2 * v + 2, (l + r) / 2, r);
            }
            dat[v] = query_func(dat[v * 2 + 1], dat[v * 2 + 2]);
        }
    }

    void update(int k, T a) {
        update(k, a, 0, 0, n);
    }

    T query(int a, int b, int k, int l, int r) {
        if (r <= a || b <= l) {
            return e;
        }
        if (a <= l && r <= b) {
            return dat[k];
        } else {
            T ul = query(a, b, k * 2 + 1, l, (l + r) / 2);
            T ur = query(a, b, k * 2 + 2, (l + r) / 2, r);
            return query_func(ul, ur);
        }
    }

    T query(int a, int b) {
        return query(a, b, 0, 0, n);
    }

    int find(int a, int b, int k, int l, int r, double x) {
        if (dat[k] < x || r <= a || b <= l) return -1;
        if (l + 1 == r) {
            if (dat[k] >= x)
                return l;
            else
                return -1;
        }
        int rv = find(a, b, 2 * k + 1, l, (l + r) / 2, x);
        if (rv != -1) return rv;
        return find(a, b, 2 * k + 2, (l + r) / 2, r, x);
    }
};

double mi(double a, double b) {
    return max(a, b);
}
double g(double a, double b) {
    return b;
}

signed main() {
    int n;
    cin >> n;
    vl a(n), b(n);
    rep(i, n) {
        cin >> a[i];
    }
    rep(i, n) {
        cin >> b[i];
    }

    vl suma(n + 1), sumb(n + 1);
    rep(i, n) {
        suma[i + 1] = suma[i] + a[i];
        sumb[i + 1] = sumb[i] + b[i];
    }

    vector<double> dp(n + 1);
    SegmentTree<double> dpx(vector<double>(n + 1), mi, g, -inf);
    dpx.update(n, inf);
    dp[n] = 0;

    rrep(i, n) {
        double temp_x = sqrt((double)a[i] / b[i]);

        if (i == 0) {
            chmax(temp_x, 1.0);
        }
        // DEBUG(temp_x);

        double nval = dpx.query(i + 1, i + 2);
        if (temp_x <= nval) {
            dpx.update(i, temp_x);
            dp[i] = dp[i + 1] + a[i] / temp_x + b[i] * temp_x;
            continue;
        }

        double low = nval, high = temp_x;
        if (i == 0) {
            chmax(low, 1.0);
        }
        auto f = [&](double x) {
            int ok = dpx.find(i + 1, n + 1, 0, 0, n + 1, x);
            // int ng = i, ok = n;
            // while (ng + 1 < ok) {
            //     int mid = (ng + ok) / 2;
            //     if (dpx.query(i + 1, mid + 1) >= x) {
            //         ok = mid;
            //     } else {
            //         ng = mid;
            //     }
            // }

            double res = (suma[ok] - suma[i]) / x + (sumb[ok] - sumb[i]) * x;
            res += dp[ok];
            return res;
        };

        rep(_, 70) {
            double x1 = (2 * low + high) / 3, x2 = (low + 2 * high) / 3;

            if (f(x1) >= f(x2)) {
                low = x1;
            } else {
                high = x2;
            }
        }

        // DEBUG(low);
        // DEBUG(f(low));
        dpx.update(i, low);
        dp[i] = f(low);
    }

    // DEBUG_VEC(dp);
    // DEBUG(dpx[0]);
    cout << dp[0] << endl;
}
0