Submission #1053486

#	Time	Username	Problem	Language	Result	Execution time	Memory
1053486		j_vdd16	Jail (JOI22_jail)	C++17	5 / 100	68 ms	86984 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 int long long
#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;

typedef uint64_t u64;
typedef int64_t i64;

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

void dfs(int node, int p, int d) {
    depth[node] = d;

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

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

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

    /*
1
7
1 2
2 3
3 4
4 5
5 6
6 7
3
1 3
4 2
2 5
    */

/*
1
8
1 2
2 3
3 4
4 5
5 6
6 7
7 8
3
1 4
2 5
3 6
*/

    int q;
    cin >> q;

    constexpr int POW = 20;
    while (q--) {
        cin >> n;

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

            adj[a].push_back(b);
            adj[b].push_back(a);
        }
        dfs(0, -1, 0);

        vi lift[POW] = {};
        vvi endPointLift[POW] = {};
        loop(i, POW) {
            lift[i] = vi(n);
            endPointLift[i] = vvi(n);
        }

        loop(i, n) lift[0][i] = parent[i];

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

            routes.push_back({s, t});
            endPointLift[0][t].push_back(i);
        }

        // for (int i = 1; i < POW; i++) {
        //     loop(j, n) {
        //         endPointLift[i][j] = endPointLift[i - 1][j];

        //         int next = lift[i - 1][j];
        //         lift[i][j] = lift[i - 1][next];

        //         //if (next == 0) continue;

        //         for (int x : endPointLift[i - 1][next]) {
        //             endPointLift[i][j].push_back(x);
        //         }
        //     }
        // }

        // vi inDegree(n);
        // vector<set<int>> out(n);
        // loop(i, m) {
        //     auto [s, t] = routes[i];

        //     vi endPointsOnRoute;
        //     if (depth[s] < depth[t]) swap(s, t);

        //     int todo = depth[s] - depth[t];
        //     loop(j, POW) {
        //         if (todo & (1 << j)) {
        //             for (int x : endPointLift[j][s]) endPointsOnRoute.push_back(x);

        //             s = lift[j][s];
        //         }
        //     }

        //     for (int j = POW - 1; j >= 0; j--) {
        //         if (lift[j][s] == lift[j][t]) continue;

        //         for (int x : endPointLift[j][s]) endPointsOnRoute.push_back(x);
        //         for (int x : endPointLift[j][t]) endPointsOnRoute.push_back(x);

        //         s = lift[j][s];
        //         t = lift[j][t];
        //     }

        //     if (s == t) {
        //         for (int x : endPointLift[0][s]) endPointsOnRoute.push_back(x);
        //     }
        //     else {
        //         for (int x : endPointLift[1][s]) endPointsOnRoute.push_back(x);
        //         for (int x : endPointLift[0][t]) endPointsOnRoute.push_back(x);
        //     }

        //     cerr << "I = " << i << ": ";
        //     for (int x : endPointsOnRoute) {
        //         if (x == i) continue;
        //         cerr << x << ' ';

        //         inDegree[x]++;
        //         out[i].insert(x);
        //     }
        //     cerr << endl;
        // }

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

        // int count = 0;
        // while (startingPoints.size()) {
        //     int node = startingPoints.top();
        //     startingPoints.pop();

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

        

        bool success = true;
        sort(all(routes));
        int prev = 0;
        for (auto [s, t] : routes) {
            if (t < prev) {
                success = false;
            }
            
            prev = t;
        }

        if (/*count == m*/success) {
            cout << "Yes" << endl;
        }
        else {
            cout << "No" << endl;
        }
    }

	return 0;
}

• Subtask 1: 5 / 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