제출 #1326312

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1326312		aren_dance	The Ties That Guide Us (CEOI23_incursion)	C++20	0 / 100	2044 ms	4632 KiB

incursion

#include <bits/stdc++.h>
#include "incursion.h"
using namespace std;
const int N=45001;
/*int visit(int v){
    cout<<"? "<<v<<'\n';
    int c;
    cin>>c;
    return c;
}*/
std::vector<int> mark(std::vector<std::pair<int, int>>f, int safe){
    queue<pair<int,int>> q;
    vector<int> ans;
    q.push({safe,0});
    vector<vector<int>> g(N);
    vector<bool> vis(N,0);
    int n=0;
    for(int i=0;i<f.size();++i){
        g[f[i].first].push_back(f[i].second);
        g[f[i].second].push_back(f[i].first);
        n=max(n,f[i].first);
        n=max(n,f[i].second);
    }
    ans.resize(n);
    vis[1]=1;
    while(!q.empty()){
        int x=q.front().first;
        int y=q.front().second;
        ans[x-1]=y;
        for(auto j:g[x]){
            if(!vis[j]){
                q.push({j,y+1});
                vis[j]=1;
            }
        }
        q.pop();
    }
    return ans;
}
vector<vector<int>> g(N);
int sz[N];
void dfs(int v,int p){
    int c=0;
    sz[v]=1;
    vector<pair<int,int>> r;
    for(auto i:g[v]){
        if(i!=p){
        dfs(i,v);
        sz[v]+=sz[i];
        r.push_back({sz[i],c});
        }
        ++c;
    }
    sort(r.begin(),r.end());
    if(!r.empty())
    swap(g[v][r[0].second],g[v][0]);
}
void locate(std::vector<std::pair<int, int>> f, int cur, int t){
    if(t==0){
        return;
    }
    for(int i=0;i<f.size();++i){
        g[f[i].first].push_back(f[i].second);
    }
    for(int i=0;i<f.size();++i){
        g[f[i].second].push_back(f[i].first);
    }
    dfs(cur,0);
    int nxt;
    for(int i=0;i<g[cur].size();++i){
        int o=visit(g[cur][i]);
        if(o>t){
            visit(cur);
        }
        else{
            nxt=g[cur][i];
            t=o;
        }
    }
    int pap=cur;
    cur=nxt;
    while(t!=0){
        int nxt;
        for(int i=0;i<g[cur].size();++i){
            if(g[cur][i]==pap){
                continue;
            }
            int o=visit(g[cur][i]);
            if(o>t){
                visit(cur);
            }
            else{
                nxt=g[cur][i];
                t=o;
            }
        }
        pap=cur;
        cur=nxt;
    }
    cout<<cur<<'\n';
}
/*int main(){
    vector<int> u=mark({{1,2}, {2,3},{3,4},{3,5}},1);
    for(int i=0;i<u.size();++i){
        cout<<u[i]<<' ';
    }
    locate({{1,2}, {2,3},{3,4},{3,5}},5,3);
    return 0;
}*/

• Subtask 0: 0 / 0
• Subtask 1: 0 / 30
• Subtask 2: 0 / 30
• Subtask 3: 0 / 40