Submission #1007188

#	Time	Username	Problem	Language	Result	Execution time	Memory
1007188		Mardonbekhazratov	Dreaming (IOI13_dreaming)	C++17	0 / 100	26 ms	9808 KiB

dreaming

#include "dreaming.h"
#include<bits/stdc++.h>

using namespace std;

#define ll long long

int n,m,l;
vector<int>sz;
vector<bool>vis;
vector<vector<pair<int,int>>>v;

int dfs(int x){
    sz[x]=0;
    vis[x]=true;
    for(auto [z,w]:v[x]){
        if(!vis[z]){
            sz[x]+=w+dfs(z);
        }
    }
    return sz[x];
}

int mn;

void dfs2(int x,int dis){
    vis[x]=true;
    int mx=0;
    for(auto [z,w]:v[x]){
        if(!vis[z]){
            mx=max(mx,sz[z]+w);
            dfs2(z,dis);
        }
    }
    mn=min(mn,max(mx,dis-sz[x]));
}

void dfs3(int x,int dis,int p=-1){
    vector<int>a;
    for(auto [z,w]:v[x]){
        if(z!=p){
            a.push_back(sz[z]+w);
            dfs3(z,dis,x);
        }
    }
    a.push_back(dis-sz[x]);
    sort(a.begin(),a.end());
    int s=a.back();
    a.pop_back();
    if(a.size()) s+=a.back();
    mn=max(mn,s);
}

int travelTime(int N, int M, int L, int A[], int B[], int T[]) {
    n=N;
    m=M;
    l=L;
    v.assign(n,{});
    for(int i=0;i<m;i++){
        v[A[i]].push_back({B[i],T[i]});
        v[B[i]].push_back({A[i],T[i]});
    }
    sz.resize(n);
    vis.assign(n,false);
    for(int i=0;i<n;i++){
        if(!vis[i]){
            dfs(i);
        }
    }
    vis.assign(n,false);
    vector<int>a;
    for(int i=0;i<n;i++){
        if(!vis[i]){
            mn=(int)1e9;
            dfs2(i,sz[i]);
            a.push_back(mn);
        }
    }
    if(a.size()==1){
        mn=0;
        dfs3(0,sz[0]);
        return mn;
    }
    sort(a.begin(),a.end());
    //for(int x:a) cout<<x<<' ';
    return a[a.size()-1]+a[a.size()-2]+l;
}

• Subtask 1: 0 / 14
• Subtask 2: 0 / 10
• Subtask 3: 0 / 23
• Subtask 4: 0 / 18
• Subtask 5: 0 / 12
• Subtask 6: 0 / 23