Submission #1345121

#TimeUsernameProblemLanguageResultExecution timeMemory
1345121chithanhnguyenRoadside Advertisements (NOI17_roadsideadverts)C++20
100 / 100
25 ms10468 KiB
/*
Author: Nguyen Chi Thanh - High School for the Gifted - VNU.HCM (i2528)
*/
#include <bits/stdc++.h>
using namespace std;

/* START OF TEMPALTE */

// #define int long long
#define ll long long
#define ull unsigned long long
#define ld long double
#define pii pair<int, int>
#define pll pair<ll, ll>
#define fi first
#define se second
#define __builtin_popcount __builtin_popcountll
#define all(x) (x).begin(), (x).end()
#define BIT(x, i) (((x) >> (i)) & 1)
#define MASK(x) (1ll << (x))
#define SZ(a) ((int32_t)a.size())

#define debug(a, l, r) {for (int _i = (l); _i <= (r); ++_i) cout << (a)[_i] << ' '; cout << '\n';}

template<class X, class Y>
bool minimize(X &x, const Y &y) {
    if (x > y) {
        x = y;
        return true;
    } else return false;
}

template<class X, class Y>
bool maximize(X &x, const Y &y) {
    if (x < y) {
        x = y;
        return true;
    } else return false;
}

/* END OF TEMPALTE */

const int MAXN = 5e4 + 5;
const int LG   = 17;
int n, q, up[LG + 1][MAXN], dist[MAXN], depth[MAXN];
int st[MAXN], timer = 0;
vector<pii> adj[MAXN];

void init() {
    cin >> n;
    for (int i = 1; i < n; ++i) {
        int u, v, w; cin >> u >> v >> w;
        u++; v++;
        adj[u].push_back({v, w});
        adj[v].push_back({u, w});
    }
}

void dfs(int u, int par = 0) {
    up[0][u] = par; st[u] = ++timer;
    for (int j = 1; j <= LG; ++j)
        up[j][u] = up[j - 1][up[j - 1][u]];

    for (auto &e : adj[u]) {
        int v = e.fi, w = e.se;
        if (v == par) continue;

        dist[v] = dist[u] + w;
        depth[v] = depth[u] + 1;
        dfs(v, u);
    }
}

int lift(int u, int k) {
    for (int i = 0; i <= __lg(k); ++i)
        if (BIT(k, i)) u = up[i][u];
    return u;
}

int lca(int u, int v) {
    if (depth[u] > depth[v]) swap(u, v);

    v = lift(v, depth[v] - depth[u]);
    if (u == v) return u;

    for (int j = LG; j >= 0; --j)
        if (up[j][u] != up[j][v]) {
            u = up[j][u];
            v = up[j][v];
        }
    return up[0][u];
}

int distance(int u, int v) {
    return dist[u] + dist[v] - 2 * dist[lca(u, v)];
}

void solve() {
    dfs(1);

    int q; cin >> q;
    vector<int> nodes;

    while (q--) {
        nodes.clear();
        for (int i = 0; i < 5; ++i) {
            int u; cin >> u;
            u += 1;
            nodes.push_back(u);
        }

        sort(all(nodes), [&](int x, int y) {
            return st[x] < st[y];
        });

        int res = 0;
        for (int i = 0; i < 5; ++i)
            res += distance(nodes[i], nodes[(i + 1) % 5]);
        cout << res / 2 << '\n';
    }
}

signed main() {
    #ifdef NCTHANH
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    #endif
    ios_base::sync_with_stdio(0);
    cin.tie(nullptr); cout.tie(nullptr);

    init();
    solve();

    return 0;
}
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