제출 #983346

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
983346		raphaelp	Island Hopping (JOI24_island)	C++17	100 / 100	9 ms	672 KiB

island

#include <bits/stdc++.h>
#include "island.h"
using namespace std;
/*vector<vector<int>> dist;
int query(int x, int k)
{
    return dist[x - 1][k] + 1;
}
void answer(int a, int b)
{
    cout << a << ' ' << b << endl;
}*/
class UnionFind
{
private:
    vector<int> p;

public:
    UnionFind(int x)
    {
        p.assign(x, 0);
        for (int i = 0; i < x; i++)
            p[i] = i;
    }
    int find(int x) { return (x == p[x]) ? x : p[x] = find(p[x]); }
    bool samecomp(int a, int b) { return (find(a) == find(b)) ? 1 : 0; }
    void merge(int a, int b)
    {
        int x = find(a), y = find(b);
        if (x == y)
            return;
        p[x] = y;
    }
};
void solve(int N, int L)
{
    UnionFind UF(N);
    for (int i = 0; i < N; i++)
    {
        for (int k = 1; k < N; k++)
        {
            int x = query(i + 1, k) - 1;
            if (x > i)
                break;
            if (UF.samecomp(i, x))
                break;
            UF.merge(i, x);
            answer(x + 1, i + 1);
        }
    }
}
/*int main()
{
    int N, L;
    cin >> N >> L;
    vector<vector<int>> AR(N);
    for (int i = 0; i < N - 1; i++)
    {
        int a, b;
        cin >> a >> b;
        a--, b--;
        AR[a].push_back(b);
        AR[b].push_back(a);
    }
    dist.assign(N, vector<int>(N, 0));
    for (int i = 0; i < N; i++)
    {
        vector<int> occ(N);
        priority_queue<pair<int, int>> PQ;
        int buff = 0;
        PQ.push({0, -i});
        while (!PQ.empty())
        {
            int x = -PQ.top().second, t = -PQ.top().first;
            PQ.pop();
            if (occ[x])
                continue;
            occ[x] = 1;
            dist[i][buff++] = x;
            for (int j = 0; j < AR[x].size(); j++)
            {
                PQ.push({-(t + 1), -AR[x][j]});
            }
        }
    }
    solve(N, L);
}*/

• Subtask 1: 2 / 2
• Subtask 2: 4 / 4
• Subtask 3: 7 / 7
• Subtask 4: 9 / 9
• Subtask 5: 13 / 13
• Subtask 6: 15 / 15
• Subtask 7: 22 / 22
• Subtask 8: 28 / 28