Submission #246873

#	Time	Username	Problem	Language	Result	Execution time	Memory
246873		receed	Factories (JOI14_factories)	C++14	0 / 100	44 ms	24320 KiB

factories

#include "factories.h"
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <cmath>
#include <cstring>
#include <cassert>
#include <string>
#include <set>
#include <map>
#include <random>
#include <bitset>
#include <string>
#include <unordered_set>
#include <unordered_map>
#include <deque>
#include <queue>
#define rep(i, n) for (int i = 0; i < (n); i++)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()

using namespace std;
using ll = long long;
using ul = unsigned long long;
using ld = long double;

const int N = 500001, L = 19;
vector<pair<ll, ll>> g[N];
vector<int> cg[N];
int tin[N], tout[N], ct, up[L][N];
ll h[N], d1[N], d2[N], inf = 1e16;

void dfs(int v, int p) {
    up[0][v] = p;
    tin[v] = ++ct;
    for (auto &u : g[v])
        if (u.first != p) {
            h[u.first] = h[v] + u.second;
            dfs(u.first, v);
        }
    tout[v] = ++ct;
}

int lca(int u, int v) {
    if (h[u] > h[v])
        swap(u, v);
    for (int i = L - 1; i >= 0; i--)
        if (h[up[i][v]] >= h[u])
            v = up[i][v];
    if (u == v)
        return u;
    for (int i = L - 1; i >= 0; i--)
        if (up[i][u] != up[i][v]) {
            u = up[i][u];
            v = up[i][v];
        }
    return up[0][u];
}

ll dfs2(int v) {
    ll ans = inf;
    for (int u : cg[v]) {
        ans = min(ans, dfs2(u));
        int cd = h[u] - h[v];
        ans = min(ans, min(d1[v] + d2[u], d1[u] + d2[v]) + cd);
        d1[v] = min(d1[v], d1[u] + cd);
        d2[v] = min(d2[v], d2[u] + cd);
    }
    return ans;
}

void Init(int n, int a[], int b[], int d[]) {
    rep(i, n - 1) {
        g[a[i]].push_back({b[i], d[i]});
        g[b[i]].push_back({a[i], d[i]});
    }
    dfs(0, 0);
    rep(i, L - 1)
        rep(j, n)
            up[i + 1][j] = up[i][up[i][j]];
    rep(i, n)
        d1[i] = d2[i] = inf;
}

long long Query(int s, int x[], int t, int y[]) {
    vector<int> li;
    rep(i, s) {
        li.push_back(x[i]);
        d1[x[i]] = 0;
    }
    rep(i, t) {
        li.push_back(y[i]);
        d2[y[i]] = 0;
    }
    sort(all(li), [](int v1, int v2) {return tin[v1] < tin[v2];});
    int k = li.size();
    rep(i, k - 1)
        li.push_back(lca(li[i], li[i + 1]));
    sort(all(li), [](int v1, int v2) {return tin[v1] < tin[v2];});
    vector<int> st;
    for (int i : li) {
        if (st.empty())
            st.push_back(i);
        else {
            while (tout[st.back()] < tout[i])
                st.pop_back();
            if (st.back() == i)
                continue;
            assert(!st.empty());
            cg[st.back()].push_back(i);
            st.push_back(i);
        }
    }
    ll ans = dfs2(li[0]);
    for (int i : li) {
        cg[i].clear();
        d1[i] = d2[i] = inf;
    }
    return ans;
}

• Subtask 1: 0 / 15
• Subtask 2: 0 / 18
• Subtask 3: 0 / 67