제출 #950735

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
950735		vladilius	Jail (JOI22_jail)	C++17	0 / 100	5088 ms	600 KiB

jail

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
 
struct FT{
    vector<int> bit;
    int n;
    FT(int ns){
        n = ns;
        bit.resize(n + 1);
    }
    int get(int v){
        int out = 0;
        while (v > 0){
            out += bit[v];
            v = (v & (v + 1)) - 1;
        }
        return out;
    }
    void upd(int v, int k){
        while (v <= n){
            bit[v] += k;
            v |= (v + 1);
        }
    }
};
 
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    
    int q; cin>>q;
    while (q--){
        int n; cin>>n;
        vector<int> g[n + 1];
        for (int i = 1; i < n; i++){
            int a, b; cin>>a>>b;
            g[a].push_back(b);
            g[b].push_back(a);
        }
        int m; cin>>m;
        vector<int> s(m + 1), t(m + 1), used(n + 1);
        for (int i = 1; i <= m; i++){
            cin>>s[i]>>t[i];
            used[s[i]] = i;
        }
        
        vector<int> tin(n + 1), tout(n + 1), p(n + 1), pp(n + 1);
        int lg = ceil(log2(n)) + 1;
        vector<int> pw[n + 1];
        for (int i = 1; i <= n; i++){
            p[i] = i;
            pw[i].resize(lg);
        }
        int timer = 0;
        function<void(int, int)> fill = [&](int v, int pr){
            tin[v] = ++timer;
            pw[v][0] = pp[v] = pr;
            for (int i = 1; i < lg; i++){
                pw[v][i] = pw[pw[v][i - 1]][i - 1];
            }
            for (int i: g[v]){
                if (i == pr) continue;
                fill(i, v);
            }
            tout[v] = timer;
        };
        fill(1, 1);
        pp[1] = 0;
        
        auto check = [&](int x, int y){
            return (tin[x] <= tin[y] && tout[x] >= tout[y]);
        };
        auto lca = [&](int x, int y){
            if (check(x, y)) return x;
            if (check(y, x)) return y;
            for (int i = lg - 1; i >= 0; i--){
                if (!check(pw[x][i], y)){
                    x = pw[x][i];
                }
            }
            return pw[x][0];
        };
        vector<int> l(m + 1);
        for (int i = 1; i <= m; i++){
            l[i] = lca(s[i], t[i]);
        }
        function<int(int)> get = [&](int v){
            if (!v || used[v]) return v;
            if (p[v] == v){
                p[v] = pp[v];
            }
            return p[v] = get(p[v]);
        };
        vector<int> order;
        vector<bool> vis(n + 1);
        function<void(int)> dfs = [&](int v){
            if (vis[v]) return;
            vis[v] = true;
            if (!used[s[v]]) return;
            used[s[v]] = 0;
            int x;
            while (check(l[v], x = get(s[v]))){
                if (!x) break;
                dfs(used[x]);
            }
            while (check(l[v], x = get(t[v]))){
                if (!x) break;
                dfs(used[x]);
            }
            used[t[v]] = v;
            order.push_back(v);
        };
        for (int i = 1; i <= m; i++){
            dfs(i);
        }
        FT T(n);
        vector<bool> k(n + 1);
        for (int i = 1; i <= m; i++){
            k[s[i]] = true;
            T.upd(i, 1);
        }
        auto upd = [&](int v, int k){
            T.upd(tin[v], k);
            T.upd(tout[v] + 1, -k);
        };
        auto sum = [&](int i){
            return T.get(tin[s[i]]) + T.get(tin[t[i]]) - 2 * T.get(tin[l[i]]) + k[l[i]];
        };
        bool out = true;
        for (int i: order){
            if (sum(i) > 1){
                out = false;
                break;
            }
            upd(s[i], -1);
            upd(t[i], 1);
            k[s[i]] = false;
        }
        cout<<((out == true) ? "Yes" : "No")<<"\n";
    }
}

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• Subtask 3: 0 / 16
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