結果

問題 No.2354 Poor Sight in Winter
ユーザー hari64
提出日時 2023-06-16 23:02:04
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 198 ms / 2,000 ms
コード長 4,339 bytes
コンパイル時間 2,140 ms
コンパイル使用メモリ 209,260 KB
最終ジャッジ日時 2025-02-14 21:25:32
ジャッジサーバーID
（参考情報） 		judge2 / judge3
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 26
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 #
プレゼンテーションモードにする

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef __int128_t lll;
typedef long double ld;
typedef pair<ll, ll> pl;
typedef tuple<ll, ll, ll> tt;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<vvl> vvvl;
typedef vector<double> vd;
typedef vector<vd> vvd;
typedef vector<vvd> vvvd;
typedef vector<bool> vb;
typedef vector<vb> vvb;
typedef vector<vvb> vvvb;
typedef vector<char> vc;
typedef vector<vc> vvc;
typedef vector<vvc> vvvc;
typedef vector<pl> vp;
typedef vector<tt> vt;
typedef vector<string> vs;
const ll INF = 1000000010;
const ll INFL = INF * INF;
const double MYPI = acos(-1);
const ld epsilon = 1e-10;
#define ovl(a, b, c, d, e, ...) e
#define pb push_back
#define eb emplace_back
#define MP make_pair
#define DEBUG(...) DEBUG_(#__VA_ARGS__, __VA_ARGS__)
#define REP1(i, n) for (int i = 0; i < (n); i++)
#define REP2(i, l, r) for (int i = (l); i < (r); i++)
#define REP3(i, l, r, d) for (int i = (l); i < (r); i += (d))
#define REP(...) ovl(__VA_ARGS__, REP3, REP2, REP1)(__VA_ARGS__)
#define RREP1(i, n) for (int i = (n)-1; i >= 0; i--)
#define RREP2(i, l, r) for (int i = (r)-1; i >= (l); i--)
#define RREP3(i, l, r, d) for (int i = (r)-1; i >= (l); i -= (d))
#define RREP(...) ovl(__VA_ARGS__, RREP3, RREP2, RREP1)(__VA_ARGS__)
#define EACH1(e, a) for (auto &e : a)
#define EACH2(x, y, a) for (auto &[x, y] : a)
#define EACH3(x, y, z, a) for (auto &[x, y, z] : a)
#define EACH(...) ovl(__VA_ARGS__, EACH3, EACH2, EACH1)(__VA_ARGS__)
#define ALL(x) begin(x), end(x)
#define RALL(x) (x).rbegin(), (x).rend()
#define sz(x) (ll) x.size()
#define LB(a, x) (lower_bound(ALL(a), x) - a.begin())
#define UB(a, x) (upper_bound(ALL(a), x) - a.begin())
#define FLG(x, i) (((x) >> (i)) & 1)
#define CNTBIT(x) __builtin_popcountll(x)
#define TOPBIT(t) (t == 0 ? -1 : 63 - __builtin_clzll(t))
#define IN(x, a, b) ((a) <= (x) && (x) < (b))
template <typename T, typename... Ts>
void OUT(const T &a, const Ts &...b) {
    cout << a;
    (cout << ... << (cout << " ", b));
    cout << endl;
}
template <typename T>
void DEBUG_(string_view name, const T &a) {
    cout << name << ": " << a << endl;
}
template <typename T>
void DEBUG_(string_view name, const vector<T> &a) {
    cout << name << ": ";
    REP(i, sz(a)) cout << a[i] << " ";
    cout << endl;
}
template <typename T1, typename T2>
bool chmax(T1 &x, const T2 &y) {
    return x < y ? x = y, 1 : 0;
}
template <typename T1, typename T2>
bool chmin(T1 &x, const T2 &y) {
    return x > y ? x = y, 1 : 0;
}
// Ο((E+V)logV)  cannot reach: INFll
vector<long long> dijkstra(const vector<vector<pair<int, long long>>> &adj, int s) {
    vector<long long> dist(int(adj.size()), INF);
    priority_queue<pair<long long, int>, vector<pair<long long, int>>,
                   greater<pair<long long, int>>>
        que;
    dist[s] = 0;
    que.emplace(dist[s], s);
    while (!que.empty()) {
        pair<long long, int> p = que.top();
        que.pop();
        if (dist[p.second] < p.first) continue;
        for (pair<int, long long> nv : adj[p.second]) {
            if (dist[nv.first] > dist[p.second] + nv.second) {
                dist[nv.first] = dist[p.second] + nv.second;
                que.emplace(dist[nv.first], nv.first);
            }
        }
    }
    return dist;
}
int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int N, K;
    cin >> N >> K;
    int sx, sy, gx, gy;
    cin >> sx >> sy >> gx >> gy;
    vp XYs(N);
    REP(i, N) {
        int x, y;
        cin >> x >> y;
        XYs[i] = {x, y};
    }
    XYs.eb(sx, sy);
    XYs.eb(gx, gy);
    int s = N;
    int g = N + 1;
    N = N + 2;
    auto is_ok = [&](long long P) -> bool {
        vector<vector<pair<int, ll>>> adj(N);
        REP(i, N) {
            auto [xi, yi] = XYs[i];
            REP(j, N) {
                if (i == j) continue;
                auto [xj, yj] = XYs[j];
                ll dist = abs(xi - xj) + abs(yi - yj);
                adj[i].eb(j, (dist - 1) / P);
            }
        }
        auto dists = dijkstra(adj, s);
        return dists[g] <= K;
    };
    long long ok, ng;
    ok = INF;
    ng = 0;
    while (abs(ok - ng) > 1) {
        long long mid = (ok + ng) / 2;
        if (is_ok(mid)) {
            ok = mid;
        } else {
            ng = mid;
        }
    }
    OUT(ok);
    return 0;
}
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