제출 #1001643

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1001643		coolboy19521	Watching (JOI13_watching)	C++17	0 / 100	20 ms	5508 KiB

watching

#pragma GCC optimize("Ofast")
#include"bits/stdc++.h"

#define int long long

using namespace std;

const int sz = 2e5 + 10;
const int inf = 1e18;

int a[sz];
int n, p, q;
bool f;

void dfs(int v, vector<vector<int>> aj[], int cl, int cr) {
    if (cl > p || cr > q) return;
    if (v == n + 1) {
        f |= (cl <= p && cr <= q);
    } else {
        for (auto& u : aj[v]) {
            if (f) return;
            dfs(u[0], aj, cl + u[1], cr + u[2]);
        }
    }
}

bool che(int mi) {
    vector<vector<int>> aj[sz];
    for (int i = 1; i <= n; i ++) {
        int d = lower_bound(a + 1, a + n + 1, a[i] + mi) - &a[i];
        int c = lower_bound(a + 1, a + n + 1, a[i] + 2 * mi) - &a[i];
        aj[i].push_back({i + d, 1, 0});
        aj[i].push_back({i + c, 0, 1});
    }
    f = false;
    dfs(1, aj, 0, 0);
    return f;
}

signed main() {
    cin.tie(nullptr)->sync_with_stdio(false);

    cin >> n >> p >> q;

    for (int i = 1; i <= n; i ++) {
        cin >> a[i];
    }

    sort(a + 1, a + n + 1);
    a[n + 1] = inf;

    int d = (a[n] - a[1]);

    int le, ri;
    le = d / (p + q) / 2, ri = d / (p + q) + 10;

    while (1 < ri - le) {
        int mi = le + (ri - le) / 2;

        if (che(mi)) {
            ri = mi;
        } else {
            le = mi;
        }
    }

    cout << ri << '\n';
}

• Subtask 1: 0 / 50
• Subtask 2: 0 / 50