Submission #1055127

#	Time	Username	Problem	Language	Result	Execution time	Memory
1055127		j_vdd16	Jail (JOI22_jail)	C++17	0 / 100	5103 ms	34020 KiB

jail

#include <algorithm>
#include <bitset>
#include <cstdint>
#include <cstring>
#include <iostream>
#include <limits.h>
#include <math.h>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>

#define loop(X, N) for(int X = 0; X < (N); X++)
#define all(V) V.begin(), V.end()
#define rall(V) V.rbegin(), V.rend()

using namespace std;

typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int, int> ii;
typedef vector<ii> vii;
typedef vector<vector<ii>> vvii;
typedef vector<bool> vb;
typedef vector<vector<bool>> vvb;


int n, m;
vvi adj;
vi depth;
vi parent;

constexpr int POW = 20;
vi lift[POW];

vii inOut;
int counter;
void dfs(int node, int p, int d) {
    depth[node] = d;
    lift[0][node] = p;

    inOut[node].first = counter++;

    for (int child : adj[node]) {
        if (child == p) continue;

        parent[child] = node;
        dfs(child, node, d + 1);
    }

    inOut[node].second = counter++;
}

bool isAncestor(int a, int b) {
    return inOut[a].first <= inOut[b].first && inOut[b].first <= inOut[a].second;
}
bool isBetween(int node, int a, int b) {
    return isAncestor(a, node) && isAncestor(node, b);
}
int getLCA(int a, int b) {
    if (depth[a] < depth[b]) swap(a, b);

    int todo = depth[a] - depth[b];
    loop(pow, POW) {
        if (todo & (1 << pow)) {
            a = lift[pow][a];
        }
    }

    if (a == b) return a;

    for (int pow = POW - 1; pow >= 0; pow--) {
        if (lift[pow][a] == lift[pow][a]) continue;

        a = lift[pow][a];
        b = lift[pow][b];
    }

    return lift[0][a];
}
bool isOnSimplePath(int node, int a, int b) {
    int lca = getLCA(a, b);

    bool result = isBetween(node, lca, a) || isBetween(node, lca, b);
    return result;
}

signed main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);

    int q;
    cin >> q;

    while (q--) {
        cin >> n;

        counter = 0;
        adj = vvi(n);
        depth = vi(n);
        parent = vi(n);
        inOut = vii(n);
        loop(i, n - 1) {
            int a, b;
            cin >> a >> b;
            a--; b--;

            adj[a].push_back(b);
            adj[b].push_back(a);
        }
        loop(i, POW) {
            lift[i] = vi(n);
        }

        dfs(0, 0, 0);

        for (int pow = 1; pow < POW; pow++) {
            loop(j, n) {
                int next = lift[pow - 1][j];
                lift[pow][j] = lift[pow - 1][next];
            }
        }

        vii routes;
        cin >> m;
        loop(i, m) {
            int s, t;
            cin >> s >> t;
            s--; t--;

            routes.push_back({s, t});
        }

        vi inDegree(m);
        vector<set<int>> out(m);
        loop(i, m) {
            auto [s1, t1] = routes[i];

            loop(j, m) {
                auto [s2, t2] = routes[j];
                if (i == j) continue;
                
                if (isOnSimplePath(t2, s1, t1)) {
                    if (!out[i].count(j)) {
                        out[i].insert(j);
                        inDegree[j]++;
                    }
                }
                if (isOnSimplePath(s2, s1, t1)) {
                    if (!out[j].count(i)) {
                        out[j].insert(i);
                        inDegree[i]++;
                    }
                }
            }

        }

        stack<int> startingPoints;
        loop(i, m) {
            if (inDegree[i] == 0) startingPoints.push(i);
        }

        int count = 0;
        vb vis(m);
        while (startingPoints.size()) {
            int node = startingPoints.top();
            startingPoints.pop();

            //if (vis[node]) continue;
            //vis[node] = true;

            count++;
            for (int child : out[node]) {
                inDegree[child]--;
                if (inDegree[child] == 0) startingPoints.push(child);
            }
        }

        if (count == m) {
            cout << "Yes" << endl;
        }
        else {
            cout << "No" << endl;
        }
    }
    
    return 0;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 16
• Subtask 4: 0 / 28
• Subtask 5: 0 / 12
• Subtask 6: 0 / 11
• Subtask 7: 0 / 23