Submission #913377

#	Time	Username	Problem	Language	Result	Execution time	Memory
913377		abcvuitunggio	Closing Time (IOI23_closing)	C++17	43 / 100	250 ms	41256 KiB

closing

#include "closing.h"
#include <bits/stdc++.h>
using namespace std;
vector <pair <int, int>> ke[200001];
long long d[200001][2],cur;
int p[200001],ch[200001];
priority_queue <pair <long long, int>, vector <pair <long long, int>>, greater <pair <long long, int>>> q;
void dfs(int u, int i, int par=-1){
    for (auto [v,w]:ke[u])
        if (v!=par){
            d[v][i]=d[u][i]+w;
            p[v]=u;
            dfs(v,i,u);
        }
}
int max_score(int N, int X, int Y, long long K, vector<int> U, vector<int> V, vector<int> W){
    for (int i=0;i<N-1;i++){
        ke[U[i]].push_back({V[i],W[i]});
        ke[V[i]].push_back({U[i],W[i]});
    }
    memset(ch,0,sizeof(ch));
    d[X][0]=d[Y][1]=0;
    dfs(X,0);
    dfs(Y,1);
    for (;X!=Y;X=p[X])
        ch[X]=1;
    ch[Y]=1;
    int res=0,cnt=0;
    for (int i=0;i<N;i++)
        q.push({min(d[i][0],d[i][1]),i});
    cur=0;
    while (!q.empty()&&cur+q.top().first<=K){
        cur+=q.top().first;
        res++;
        q.pop();
    }
    while (!q.empty())
        q.pop();
    cur=0;
    for (int i=0;i<N;i++){
        if (ch[i]){
            q.push({abs(d[i][0]-d[i][1]),i});
            cur+=min(d[i][0],d[i][1]);
            cnt++;
        }
        else
            q.push({min(d[i][0],d[i][1]),i});
    }
    while (!q.empty()&&cur+q.top().first<=K){
        cur+=q.top().first;
        int u=q.top().second;
        cnt++;
        q.pop();
        if (!ch[u]){
            q.push({abs(d[u][0]-d[u][1]),u});
            ch[u]=1;
        }
    }
    while (!q.empty())
        q.pop();
    for (int i=0;i<N;i++)
        ke[i].clear();
    return max(res,(cur>K?0:cnt));
}

• Subtask 0: 0 / 0
• Subtask 1: 8 / 8
• Subtask 2: 9 / 9
• Subtask 3: 12 / 12
• Subtask 4: 14 / 14
• Subtask 5: 0 / 9
• Subtask 6: 0 / 11
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 17