結果

問題 No.3189 Semifinal Stage
ユーザー 👑 potato167
提出日時 2025-06-20 22:11:30
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 1,505 ms / 4,000 ms
コード長 10,171 bytes
コンパイル時間 2,780 ms
コンパイル使用メモリ 209,372 KB
実行使用メモリ 27,660 KB
最終ジャッジ日時 2025-06-20 22:12:06
合計ジャッジ時間 27,844 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge4
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 * 2
other AC * 30
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 # 

//#include <bits/stdc++.h>
//using namespace std;
//using ll=long long;
//const ll ILL=2167167167167167167;
//const int INF=2100000000;
//#define rep(i,a,b) for (int i=(int)(a);i<(int)(b);i++)
//#define all(p) p.begin(),p.end()
//template<class T> using _pq = priority_queue<T, vector<T>, greater<T>>;
//template<class T> int LB(vector<T> &v,T a){return lower_bound(v.begin(),v.end(),a)-v.begin();}
//template<class T> int UB(vector<T> &v,T a){return upper_bound(v.begin(),v.end(),a)-v.begin();}
//template<class T> bool chmin(T &a,T b){if(b<a){a=b;return 1;}else return 0;}
//template<class T> bool chmax(T &a,T b){if(a<b){a=b;return 1;}else return 0;}
//template<class T> void So(vector<T> &v) {sort(v.begin(),v.end());}
//template<class T> void Sore(vector<T> &v) {sort(v.begin(),v.end(),[](T x,T y){return x>y;});}
//bool yneos(bool a,bool upp=false){if(a){cout<<(upp?"YES\n":"Yes\n");}else{cout<<(upp?"NO\n":"No\n");}return a;}
//template<class T> void vec_out(vector<T> &p,int ty=0){
//    if(ty==2){cout<<'{';for(int i=0;i<(int)p.size();i++){if(i){cout<<",";}cout<<'"'<<p[i]<<'"';}cout<<"}\n";}
//    else{if(ty==1){cout<<p.size()<<"\n";}for(int i=0;i<(int)(p.size());i++){if(i) cout<<" ";cout<<p[i];}cout<<"\n";}}
//template<class T> T vec_min(vector<T> &a){assert(!a.empty());T ans=a[0];for(auto &x:a) chmin(ans,x);return ans;}
//template<class T> T vec_max(vector<T> &a){assert(!a.empty());T ans=a[0];for(auto &x:a) chmax(ans,x);return ans;}
//template<class T> T vec_sum(vector<T> &a){T ans=T(0);for(auto &x:a) ans+=x;return ans;}
//int pop_count(long long a){int res=0;while(a){res+=(a&1),a>>=1;}return res;}
//template<class T> T square(T a){return a * a;}
//
//#include "po167_library/graph/tree/LCA.hpp"
//
//void solve();
//// POP'N ROLL MUSIC / TOMOO
//int main() {
//    ios::sync_with_stdio(false);
//    cin.tie(nullptr);
//
//    int t = 1;
//    // cin >> t;
//    rep(i, 0, t) solve();
//}
//
//void solve(){
//    int N;
//    cin >> N;
//    const int B = 320;
//    vector<vector<int>> G(N);
//    rep(i, 0, N - 1){
//        int a, b;
//        cin >> a >> b;
//        a--, b--;
//        G[a].push_back(b);
//        G[b].push_back(a);
//    }
//    int Q;
//    cin >> Q;
//    vector<int> T(Q), V(Q);
//    rep(i, 0, Q) cin >> T[i] >> V[i], V[i]--;
//    po167::LCA L(G);
//    vector<int> ans(N);
//    vector<int> col(N);
//    vector<int> rem;
//    rep(i, 0, Q){
//        if (i % B == 0){
//            rem.clear();
//            vector<int> C(N, 1);
//            int r = min(i + B, Q);
//            rep(j, i, r) if (T[j] == 1) C[V[j]] = 0;
//            rep(j, 0, N) ans[j] = INF;
//            vector<int> order;
//            rep(j, 0, N) if (C[j] == 0) rem.push_back(j);
//            rep(j, 0, N) if (C[j] == 1 && col[j] == 1){
//                ans[j] = 0;
//                order.push_back(j);
//            }
//            rep(rp, 0, order.size()){
//                int a = order[rp];
//                for (auto x : G[a]) if (ans[x] == INF){
//                    ans[x] = ans[a] + 1;
//                    order.push_back(x);
//                }
//            }
//        }
//        if (T[i] == 1) col[V[i]] ^= 1;
//        else{
//            int a = ans[V[i]];
//            for (auto x : rem) if (col[x] == 1) chmin(a, L.dist(V[i], x));
//            cout << a << "\n";
//        }
//    }
//}
//
#line 1 "h.cpp"
#include <bits/stdc++.h>
using namespace std;
using ll=long long;
const ll ILL=2167167167167167167;
const int INF=2100000000;
#define rep(i,a,b) for (int i=(int)(a);i<(int)(b);i++)
#define all(p) p.begin(),p.end()
template<class T> using _pq = priority_queue<T, vector<T>, greater<T>>;
template<class T> int LB(vector<T> &v,T a){return lower_bound(v.begin(),v.end(),a)-v.begin();}
template<class T> int UB(vector<T> &v,T a){return upper_bound(v.begin(),v.end(),a)-v.begin();}
template<class T> bool chmin(T &a,T b){if(b<a){a=b;return 1;}else return 0;}
template<class T> bool chmax(T &a,T b){if(a<b){a=b;return 1;}else return 0;}
template<class T> void So(vector<T> &v) {sort(v.begin(),v.end());}
template<class T> void Sore(vector<T> &v) {sort(v.begin(),v.end(),[](T x,T y){return x>y;});}
bool yneos(bool a,bool upp=false){if(a){cout<<(upp?"YES\n":"Yes\n");}else{cout<<(upp?"NO\n":"No\n");}return a;}
template<class T> void vec_out(vector<T> &p,int ty=0){
    if(ty==2){cout<<'{';for(int i=0;i<(int)p.size();i++){if(i){cout<<",";}cout<<'"'<<p[i]<<'"';}cout<<"}\n";}
    else{if(ty==1){cout<<p.size()<<"\n";}for(int i=0;i<(int)(p.size());i++){if(i) cout<<" ";cout<<p[i];}cout<<"\n";}}
template<class T> T vec_min(vector<T> &a){assert(!a.empty());T ans=a[0];for(auto &x:a) chmin(ans,x);return ans;}
template<class T> T vec_max(vector<T> &a){assert(!a.empty());T ans=a[0];for(auto &x:a) chmax(ans,x);return ans;}
template<class T> T vec_sum(vector<T> &a){T ans=T(0);for(auto &x:a) ans+=x;return ans;}
int pop_count(long long a){int res=0;while(a){res+=(a&1),a>>=1;}return res;}
template<class T> T square(T a){return a * a;}

#line 4 "/Users/Shared/po167_library/ds/Sparse_table.hpp"
namespace po167{
template<class T, T(*op)(T, T)>
struct Sparse_table{
    int n;
    int depth;
    std::vector<std::vector<T>> val;
    void init(std::vector<T> &v){
        depth = 1;
        n = v.size();
        while ((1 << depth) <= n) depth++;
        val.resize(depth);
        val[0] = v;
        for (int i = 1; i < depth; i++){
            val[i].resize(n);
            for (int j = 0; j <= n - (1 << i); j++){
                val[i][j] = op(val[i - 1][j], val[i - 1][j + (1 << (i - 1))]);
            }
        }
    }
    Sparse_table(std::vector<T> v){
        init(v);
    }
    Sparse_table(){}
    // 0 <= l < r <= n
    // if l == r : assert
    T prod(int l, int r){
        assert(0 <= l && l < r && r <= n);
        int z=31-__builtin_clz(r-l);
        return op(val[z][l], val[z][r - (1 << z)]);
    }
};
}
#line 6 "/Users/Shared/po167_library/graph/tree/LCA.hpp"
namespace po167{
int op(int a, int b){
    return std::min(a, b);
}
struct LCA{
    Sparse_table<int, op> table;
    std::vector<int> depth;
    std::vector<int> E;
    std::vector<int> order;
    int var_num;
    void init(std::vector<std::vector<int>> &g, int root = 0){
        var_num = g.size();
        assert(0 <= root && root < var_num);
        std::vector<int> val;
        depth.assign(var_num, -1);
        depth[root] = 0;
        E.resize(var_num);
        std::vector<int> tmp;
        order.clear();
        tmp.reserve(var_num);
        order.reserve(var_num);
        int c = 0;
        auto dfs = [&](auto self, int var, int pare) -> void {
            E[var] = c++;
            if (var != root) tmp.push_back(E[pare]);
            order.push_back(var);
            for (auto x : g[var]) if (depth[x] == -1){
                depth[x] = depth[var] + 1;
                self(self, x, var);
            }
        };
        dfs(dfs, root, -1);
        assert(c == var_num);
        table.init(tmp);
    }
    void init(std::vector<int> &pare){
        int root = -1;
        int n = pare.size();
        std::vector<std::vector<int>> g(n);
        for (int i = 0; i < n; i++){
            if (pare[i] < 0){
                assert(root == -1);
                root = i;
            }
            else{
                assert(0 <= pare[i] && pare[i] < n);
                g[pare[i]].push_back(i);
            }
        }
        assert(root != -1);
        init(g, root);
    }
    LCA (std::vector<std::vector<int>> g, int root = 0){
        init(g, root);
    }
    LCA (std::vector<int> pare){
        init(pare);
    }
    LCA(){
        
    }
    int lca(int a, int b){
        assert(0 <= std::min(a, b) && std::max(a, b) < var_num);
        if (a == b) return a;
        if (E[a] > E[b]) std::swap(a, b);
        return order[table.prod(E[a], E[b])];
    }
    int dist(int a, int b){
        assert(0 <= std::min(a, b) && std::max(a, b) < var_num);
        return depth[a] + depth[b] - 2 * depth[lca(a, b)];
    }
    int back(int var, int len){
        assert(len <= depth[var]);
        if (len == 0) return var;
        int l = 0, r = E[var];
        while (r - l > 1){
            int m = (l + r) / 2;
            if (depth[var] - depth[order[table.prod(m, E[var])]] < len){
                r = m;
            }
            else l = m;
        }
        return order[table.prod(l, E[var])];
    }
    // a -> b
    int jump(int a, int b, int len){
        int c = lca(a, b);
        if (len <= depth[a] - depth[c]) return back(a, len);
        len -= depth[a] - depth[c];
        if (len <= depth[b] - depth[c]) return back(b, depth[b] - depth[c] - len);
        return -1;
    }
};

}
#line 26 "h.cpp"

void solve();
// POP'N ROLL MUSIC / TOMOO
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int t = 1;
    // cin >> t;
    rep(i, 0, t) solve();
}

void solve(){
    int N;
    cin >> N;
    const int B = 320;
    vector<vector<int>> G(N);
    rep(i, 0, N - 1){
        int a, b;
        cin >> a >> b;
        a--, b--;
        G[a].push_back(b);
        G[b].push_back(a);
    }
    int Q;
    cin >> Q;
    vector<int> T(Q), V(Q);
    rep(i, 0, Q) cin >> T[i] >> V[i], V[i]--;
    po167::LCA L(G);
    vector<int> ans(N);
    vector<int> col(N);
    vector<int> rem;
    rep(i, 0, Q){
        if (i % B == 0){
            rem.clear();
            vector<int> C(N, 1);
            int r = min(i + B, Q);
            rep(j, i, r) if (T[j] == 1) C[V[j]] = 0;
            rep(j, 0, N) ans[j] = INF;
            vector<int> order;
            rep(j, 0, N) if (C[j] == 0) rem.push_back(j);
            rep(j, 0, N) if (C[j] == 1 && col[j] == 1){
                ans[j] = 0;
                order.push_back(j);
            }
            rep(rp, 0, order.size()){
                int a = order[rp];
                for (auto x : G[a]) if (ans[x] == INF){
                    ans[x] = ans[a] + 1;
                    order.push_back(x);
                }
            }
        }
        if (T[i] == 1) col[V[i]] ^= 1;
        else{
            int a = ans[V[i]];
            for (auto x : rem) if (col[x] == 1) chmin(a, L.dist(V[i], x));
            cout << a << "\n";
        }
    }
}
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