Submission #476059

#	Time	Username	Problem	Language	Result	Execution time	Memory
476059		blue	Pipes (CEOI15_pipes)	C++17	20 / 100	5063 ms	48816 KiB

pipes

#include <iostream>
#include <vector>
using namespace std;

struct disjoint_set
{
    int N;
    vector<int> parent;
    vector<int> subtree;

    int cc;

    disjoint_set()
    {
        ;
    }

    disjoint_set(int N_)
    {
        N = N_;
        cc = N;
        parent = vector<int>(1+N);
        subtree = vector<int>(1+N, 1);
        for(int i = 1; i <= N; i++) parent[i] = i;
    }

    int root(int u)
    {
        int v = u;
        while(parent[v] != v) v = parent[v];
        parent[u] = v;
        return parent[u];
    }

    bool connected(int u, int v)
    {
        return root(u) == root(v);
    }

    void join(int u, int v)
    {
        u = root(u);
        v = root(v);
        if(u == v) return;
        if(subtree[u] < subtree[v]) swap(u, v);
        parent[v] = u;
        subtree[u] += subtree[v];
        cc--;
    }
};

int main()
{
    int N, M;
    cin >> N >> M;

    int u[M+1], v[M+1];
    for(int j = 1; j <= M; j++) cin >> u[j] >> v[j];

    disjoint_set basic(N);
    for(int j = 1; j <= M; j++)
        basic.join(u[j],v[j]);

    for(int k = 1; k <= M; k++)
    {
        disjoint_set nw(N);
        for(int j = 1; j <= M; j++)
        {
            if(j == k) continue;
            nw.join(u[j], v[j]);
        }
        if(basic.cc != nw.cc)
        {
            cout << u[k] << ' ' << v[k] << '\n';
        }
    }
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10