Submission #57872

#	Time	Username	Problem	Language	Result	Execution time	Memory
57872		Autoratch	Dreaming (IOI13_dreaming)	C++14	0 / 100	57 ms	12664 KiB

dreaming

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

vector<vector<pair<int,int> > > adj;
vector<bool> visited,in;
vector<int> cmp,st;
queue<int> q;
priority_queue<pair<int,pair<int,int> >,vector<pair<int,pair<int,int> > >,greater<pair<int,pair<int,int> > > > pq;

int solve(int x,int n)
{
    int sz = 0;
    q.push(x);
    visited[x] = true;
    in.assign(n,false);
    while(!q.empty())
    {
        int p = q.front();
        q.pop();
        sz++;
        in[p] = true;
        for(int i = 0;i < adj[p].size();i++) if(!visited[adj[p][i].second]){ visited[adj[p][i].second] = true; q.push(adj[p][i].second); }
    }
    while(!pq.empty()) pq.pop();
    for(int i = 0;i < n;i++) if(in[i] and adj[i].size()<=1){ pq.push({0,{i,i}}); st[i] = 1; }
    if(sz==1) return 0;
    int ans;
    while(true)
    {
        int w = pq.top().first,p = pq.top().second.first,pr = pq.top().second.second;
        pq.pop();
        if(p!=pr) st[p]+=st[pr];
        if(st[p]==sz){ ans = w; break; }
        for(int i = 0;i < adj[p].size();i++) if(adj[p][i].second!=pr) pq.push({adj[p][i].first+w,{adj[p][i].second,p}});
    }
    return ans;
}


int travelTime(int n,int m,int l,int a[],int b[],int t[])
{
    adj.resize(n);
    visited.resize(n);
    for(int i = 0;i < n;i++)
    {
        adj[a[i]].push_back({t[i],b[i]});
        adj[b[i]].push_back({t[i],a[i]});
    }
    for(int i = 0;i < n;i++)
    {
        if(visited[i]) continue;
        cmp.push_back(solve(i,n));
    }
    sort(cmp.begin(),cmp.end());
    reverse(cmp.begin(),cmp.end());
    if(cmp.size()==1) return cmp[0];
    else if(cmp.size()==2) return cmp[0]+cmp[1]+l;
    else return max(cmp[0]+cmp[1]+l,cmp[1]+cmp[2]+l+l);
}

Compilation message (stderr)

dreaming.cpp: In function 'int solve(int, int)':
dreaming.cpp:23:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i = 0;i < adj[p].size();i++) if(!visited[adj[p][i].second]){ visited[adj[p][i].second] = true; q.push(adj[p][i].second); }
                       ~~^~~~~~~~~~~~~~~
dreaming.cpp:35:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i = 0;i < adj[p].size();i++) if(adj[p][i].second!=pr) pq.push({adj[p][i].first+w,{adj[p][i].second,p}});
                       ~~^~~~~~~~~~~~~~~

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