#1194215 (C++17) No.399 動的な領主

• 問題: No.399 動的な領主
• ユーザー: 👑 AngrySadEight
• 提出日時: 2026-10-23 02:28:14
• 言語: C++17 (gcc 15.3.0 + boost 1.92.0 + ACL)
• 結果: WA
• 実行時間: -
• コード長: 10,306 bytes
• コンパイル時間: 4,097 ms
• コンパイル使用メモリ: 242,716 KB
• 実行使用メモリ: 64,740 KB
• 最終ジャッジ日時: 2026-10-23 02:28:34
• 合計ジャッジ時間: 8,863 ms
• ジャッジサーバーID （参考情報）: judge1_0 / judge3_0

ファイルパターン	結果
other	AC * 5 WA * 14

ソースコード

#include <algorithm>
#include <atcoder/all>
#include <bitset>
#include <cassert>
#include <cmath>
#include <ctime>
#include <functional>
#include <iomanip>
#include <iostream>
#include <map>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <tuple>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
using namespace std;
using namespace atcoder;
typedef long long ll;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define repr(i, n) for (int i = (int)(n) - 1; i >= 0; i--)
#define repk(i, k, n) for (int i = k; i < (int)(n); i++)
#define all(v) v.begin(), v.end()
#define mod1 1000000007
#define mod2 998244353
#define mod3 100000007
#define vi vector<int>
#define vs vector<string>
#define vc vector<char>
#define vl vector<ll>
#define vb vector<bool>
#define vvi vector<vector<int>>
#define vvc vector<vector<char>>
#define vvl vector<vector<ll>>
#define vvb vector<vector<bool>>
#define vvvi vector<vector<vector<int>>>
#define vvvl vector<vector<vector<ll>>>
#define pii pair<int, int>
#define pil pair<int, ll>
#define pli pair<ll, int>
#define pll pair<ll, ll>
#define vpii vector<pair<int, int>>
#define vpll vector<pair<ll, ll>>
#define vvpii vector<vector<pair<int, int>>>
#define vvpll vector<vector<pair<ll, ll>>>

template <typename T>
void debug(T e) {
    cerr << e << endl;
}

template <typename T>
void debug(vector<T> &v) {
    rep(i, v.size()) { cerr << v[i] << " "; }
    cerr << endl;
}

template <typename T>
void debug(vector<vector<T>> &v) {
    rep(i, v.size()) {
        rep(j, v[i].size()) { cerr << v[i][j] << " "; }
        cerr << endl;
    }
}

template <typename T>
void debug(vector<pair<T, T>> &v) {
    rep(i, v.size()) { cerr << v[i].first << " " << v[i].second << endl; }
}

template <typename T>
void debug(set<T> &st) {
    for (auto itr = st.begin(); itr != st.end(); itr++) {
        cerr << *itr << " ";
    }
    cerr << endl;
}

template <typename T>
void debug(multiset<T> &ms) {
    for (auto itr = ms.begin(); itr != ms.end(); itr++) {
        cerr << *itr << " ";
    }
    cerr << endl;
}

template <typename T>
void debug(map<T, T> &mp) {
    for (auto itr = mp.begin(); itr != mp.end(); itr++) {
        cerr << itr->first << " " << itr->second << endl;
    }
}

void debug_out() { cerr << endl; }

template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
    cerr << H << " ";
    debug_out(T...);
}

using mint = modint998244353;

void debug_mint1(vector<mint> &vec) {
    for (int i = 0; i < vec.size(); i++) {
        cerr << vec[i].val() << " ";
    }
    cerr << endl;
}

void debug_mint2(vector<vector<mint>> &vec) {
    for (int i = 0; i < vec.size(); i++) {
        for (int j = 0; j < vec[i].size(); j++) {
            cerr << vec[i][j].val() << " ";
        }
        cerr << endl;
    }
}

struct HLDecomp{
    ll N;
    vector<ll> u;
    vector<ll> v;
    vector<vector<ll>> graph;
    vector<ll> lsize;
    vector<vector<ll>> paths; // 頂点群のパス
    vector<vector<ll>> paths_e; // 辺群のパス
    vector<pll> ids; // その頂点がどの系列の何番目に属するか？
    vector<ll> prev; // 前の頂点に向かう頂点の情報
    vector<ll> prev_e; // 前の頂点に向かう辺の情報
    vector<ll> euler_tour;
    vector<ll> in_order;

    // option
    vector<ll> depth;
    
    HLDecomp(ll N_, vector<ll> &u_, vector<ll> &v_){
        N = N_;
        u.resize(N - 1);
        v.resize(N - 1);
        rep(i, N - 1){
            u[i] = u_[i];
        }
        rep(i, N - 1){
            v[i] = v_[i];
        }
        graph.resize(N);
        rep(i, N - 1){
            graph[u[i]].push_back(v[i]);
            graph[v[i]].push_back(u[i]);
        }
    }

    void dfs(vector<bool> &isvisited, ll v){
        isvisited[v] = true;
        ll ret = 1;
        for (ll x: graph[v]){
            if (isvisited[x]) continue;
            depth[x] = depth[v] + 1;
            dfs(isvisited, x);
            ret += lsize[x];
        }
        lsize[v] = ret;
        return;
    }

    void calc_size(){
        lsize.resize(N, 0);
        depth.resize(N, 0);
        vector<bool> isvisited(N, false);
        dfs(isvisited, 0);
        return;
    }

    void dfs2(vector<ll> &h_child, vector<bool> &isvisited, ll v){
        isvisited[v] = true;
        euler_tour.push_back(v);
        if (h_child[v] != -1){
            dfs2(h_child, isvisited, h_child[v]);
        }
        for (ll x: graph[v]){
            if (x == h_child[v]) continue;
            if (isvisited[x]) continue;
            dfs2(h_child, isvisited, x);
        }
        return;
    }

    void prepare(){
        calc_size();
        prev.resize(N, -1);
        prev_e.resize(N, -1);
        paths.resize(N);
        paths_e.resize(N);
        ids.resize(N);
        in_order.resize(N);
        euler_tour.resize(0);

        vector<ll> h_child(N, -1);
        for (ll i = 0; i < N; i++){
            ll max_cs = 0;
            ll max_id = -1;
            for (ll x: graph[i]){
                if (lsize[x] < lsize[i]){
                    if (max_cs < lsize[x]){
                        max_cs = lsize[x];
                        max_id = x;
                    }
                }
            }
            if (max_id != -1){
                h_child[i] = max_id;
            }
        }
        for (ll i = 0; i < N - 1; i++){
            if (lsize[u[i]] < lsize[v[i]]){
                prev[u[i]] = v[i];
                prev_e[u[i]] = i;
            }
            else{
                prev[v[i]] = u[i];
                prev_e[v[i]] = i;
            }
        }
        
        for (ll i = 0; i < N; i++){
            if (lsize[i] == 1){
                ll now = i;
                paths[i].push_back(i);
                ids[i] = make_pair(i, 0);
                while (prev[now] != -1){
                    if (h_child[prev[now]] != now){
                        break;
                    }
                    paths_e[i].push_back(prev_e[now]);
                    paths[i].push_back(prev[now]);
                    now = prev[now];
                    ids[now] = make_pair(i, paths[i].size() - 1);
                }
            }
        }
        vector<bool> isvisited(N, false);
        dfs2(h_child, isvisited, 0);

        rep(i, N){
            in_order[euler_tour[i]] = i;
        }
        return;
    }

    ll lca_query(ll u, ll v){
        ll now_u = u;
        ll now_v = v;
        while (true){
            if (ids[now_u].first == ids[now_v].first){
                if (ids[now_u].second <= ids[now_v].second){
                    return paths[ids[now_v].first][ids[now_v].second];
                }
                else{
                    return paths[ids[now_u].first][ids[now_u].second];
                }
            }
            else if (in_order[now_u] < in_order[now_v]){
                now_v = prev[paths[ids[now_v].first].back()];
            }
            else{
                now_u = prev[paths[ids[now_u].first].back()];
            }
        }
    }

    ll lca_dist(ll u, ll v){
        ll lca_v = lca_query(u, v);
        return depth[u] + depth[v] - 2 * depth[lca_v];
    }

    vector<pll> find_route(ll u, ll v){
        vector<pll> ret(0);
        ll lca_v = lca_query(u, v);
        if (lca_v == u){
            ret.push_back(make_pair(v, u));
        }
        else if (lca_v == v){
            ret.push_back(make_pair(u, v));
        }
        else{
            ll now_u = u;
            while (true){
                if (ids[lca_v].first == ids[now_u].first){
                    ret.push_back(make_pair(now_u, lca_v));
                    break;
                }
                else{
                    ret.push_back(make_pair(now_u, paths[ids[now_u].first].back()));
                    now_u = prev[paths[ids[now_u].first].back()];
                }
            }
            ll now_v = v;
            while (true){
                if (ids[lca_v].first == ids[now_v].first){
                    ret.push_back(make_pair(now_v, lca_v));
                    break;
                }
                else{
                    ret.push_back(make_pair(now_v, paths[ids[now_v].first].back()));
                    now_v = prev[paths[ids[now_v].first].back()];
                }
            }
        }
        return ret;
    }
};

// 区間加算区間和の遅延セグ木

struct S{
    ll val;
    ll size;
};

S op(S a, S b){
    return S{a.val + b.val, a.size + b.size};
}

S e(){
    return S{0, 0};
}

S mapping(ll f, S x){
    return S{x.val + f * x.size, x.size};
}

ll composition(ll f, ll g){
    return f + g;
}

ll id(){
    return 0LL;
}

int main() {
    // HL 分解の verify
    ll N;
    cin >> N;
    vector<ll> x(N - 1);
    vector<ll> y(N - 1);
    rep(i, N - 1){
        cin >> x[i] >> y[i];
        x[i]--;
        y[i]--;
    }
    ll Q;
    cin >> Q;
    vector<ll> a(Q);
    vector<ll> b(Q);
    rep(i, Q){
        cin >> a[i] >> b[i];
        a[i]--;
        b[i]--;
    }

    HLDecomp hld(N, x, y);
    hld.prepare();
    // debug(hld.depth);

    vector<vector<ll>> paths = hld.paths;
    vector<pll> ids = hld.ids;
    vector<lazy_segtree<S, op, e, ll, mapping, composition, id>> seg(N);
    for (ll i = 0; i < N; i++){
        ll len = paths[i].size();
        if (len > 0){
            seg[i] = lazy_segtree<S, op, e, ll, mapping, composition, id>(len);
            rep(j, len){
                seg[i].set(j, S{1, 1});
            }
        }
    }

    ll ans = 0;
    rep(i, Q){
        vector<pll> rt = hld.find_route(a[i], b[i]);
        ll len = rt.size();
        for (ll j = 0; j < len; j++){
            ll id = ids[rt[j].first].first;
            ll left = ids[rt[j].first].second;
            ll right = ids[rt[j].second].second;
            if (ids[rt[j].second].first != id){
                return 0;
            }
            // debug_out(id, left, right);
            if (len > 1 && j == len - 1){
                ans += seg[id].prod(left, right).val;
                seg[id].apply(left, right, 1);
            }
            else{
                ans += seg[id].prod(left, right + 1).val;
                seg[id].apply(left, right + 1, 1);
            }
        }
        // cout << ans << endl;
    }
    cout << ans << endl;
}