Submission #1153830

#	Time	Username	Problem	Language	Result	Execution time	Memory
1153830		lampooppp	Island Hopping (JOI24_island)	C++17	100 / 100	3 ms	408 KiB

island

#ifndef SKY
#include "island.h"
#endif // SKY

#include <bits/stdc++.h>
using namespace std;



const int N=300;

#ifdef SKY
int n;
vector<int> adj[N+1];
int d[301][301];
int vis[N+1];
int tme=0;
int now;

void dfs(int u)
{
    for(int v : adj[u])
    {
        if(vis[v]==tme) continue;
        vis[v]=tme;
        d[now][v]=d[now][u]+1;
        dfs(v);
    }
}

int cntq=0;

int query(int v, int k)
{
    cntq++;
    vector<pair<int,int>> x;
    for(int i=1;i<=n;++i)
    {
        if(i==v) continue;
        x.push_back({d[v][i]*N+i,i});
    }
    sort(x.begin(), x.end());
    return x[k-1].second;
}

void answer(int x, int y)
{
    cout << x << " " << y << '\n';
}

#endif // SKY


bool got[N+1];
int dem=0;

int query(int v, int k);

void answer(int x, int y);

void solve(int n ,int t)
{
    got[1]=true;
    int x = query(1,1);
    answer(1,x);
    got[x]=1;
    dem=1;
    int cal=2;
    while(dem<n-1)
    {
        int x = query(1,cal);
        cal++;
        if(got[x]) continue;
        int c=1;
        while(true)
        {
            int y = query(x,c);
            c++;
            if(got[y])
            {
                got[x]=1;
                answer(x,y);
                dem++;
                break;
            }
            else
            {
                answer(x,y);
                dem++;
                got[y]=1;
            }
        }
    }

}



#ifdef SKY
int main()
{
    cout << "running on machine \n";
    cin >> n;
    int u,v;
    for(int i=1;i<n;++i)
    {
        cin >> u >> v;
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    for(int i=1;i<=n;++i)
    {
        tme++;
        now=i;
        vis[i]=tme;
        dfs(i);
    }
    for(int i=1;i<=n;++i)
    {
        for(int j=1;j<=n;++j)
        {
            cout << d[i][j] << " ";
        }
        cout << '\n';
    }
    cout << '\n';
    solve(n,n*2);
    cout << cntq << '\n';
}
#endif // SKY

• 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