Submission #990967

#	Time	Username	Problem	Language	Result	Execution time	Memory
990967		tincamatei	Cat Exercise (JOI23_ho_t4)	C++14	0 / 100	0 ms	348 KiB

Main

#include <bits/stdc++.h>

struct DSU {
    std::vector<int> height;
    std::vector<int> boss;

    explicit DSU(int N) {
        boss.resize(1 + N);
        height.resize(1 + N, 1);
        for (int i = 1; i <= N; i++)
            boss[i] = i;
    }

    int find(int x) {
        if (x == boss[x])
            return x;

        boss[x] = find(boss[x]);
        return boss[x];
    }

    void merge(int a, int b) {
        boss[find(a)] = find(b);
    }
};

int main() {
    std::cin.tie(NULL);
    std::iostream::sync_with_stdio(false);

    int N;
    std::cin >> N;

    std::vector<int> perm(1 + N);
    
    for (int i = 1; i <= N; i++)
        std::cin >> perm[i];

    std::vector<std::vector<int>> graph(1 + N);

    for (int i = 0; i < N - 1; i++) {
        int a, b;
        std::cin >> a >> b;
        a = perm[a];
        b = perm[b];

        graph[a].push_back(b);
        graph[b].push_back(a);
    }

    DSU dsu(N);

    for (int node = 1; node <= N; node++) {
        int height = 0;
        for (auto it: graph[node]) {
            if (node > it) {
                height = std::max(height, dsu.height[dsu.find(it)]);
                dsu.merge(node, it);
            }
        }

        dsu.height[dsu.find(node)] = 1 + height;
    }

    std::cout << dsu.height[dsu.find(N)];

    return 0;
}

• Subtask 1: 0 / 7
• Subtask 2: 0 / 7
• Subtask 3: 0 / 7
• Subtask 4: 0 / 10
• Subtask 5: 0 / 20
• Subtask 6: 0 / 23
• Subtask 7: 0 / 26