Submission #1059927

#	Time	Username	Problem	Language	Result	Execution time	Memory
1059927		alexander707070	Fun Tour (APIO20_fun)	C++14	66 / 100	161 ms	38344 KiB

fun

#include<bits/stdc++.h>
#include "fun.h"
 
#define MAXN 100007
using namespace std;
 
int n,centroid,sz[MAXN],dist[MAXN],curr;
vector< vector< pair<int,int> > > subtrees;
int best,last;
vector<int> perm;
 
bool cmp(vector< pair<int,int> > fr,vector< pair<int,int> > sc){
    return fr.size()<sc.size();
}
 
vector<int> createFunTour(int N, int Q){
    n=N;
 
    for(int i=0;i<n;i++){
        sz[i]=attractionsBehind(0,i);
        if(sz[i]>=n/2+1 and sz[i]<=sz[centroid])centroid=i;
    }
    
    for(int i=0;i<n;i++){
        dist[i]=hoursRequired(centroid,i);
        if(dist[i]==1)subtrees.push_back({{1,i}});
    }
 
    for(int i=0;i<n;i++){
        if(dist[i]<=1)continue;
 
        for(int f=0;f<subtrees.size();f++){
            if(f==subtrees.size()-1){
                subtrees.back().push_back({dist[i],i});
                break;
            }
 
            curr=hoursRequired(subtrees[f][0].second,i);
            if(curr+1==dist[i]){
                subtrees[f].push_back({dist[i],i});
                break;
            }
        }
    }
 
    for(int i=0;i<subtrees.size();i++){
        sort(subtrees[i].begin(),subtrees[i].end());
    }
 
    last=-1;

    int subtr=subtrees.size();
    bool bad=false;
 
    if(subtrees.size()==2){
        if(subtrees[0].size()<=subtrees[1].size() and !subtrees[0].empty())last=subtrees[0][0].second;
        else if(!subtrees[0].empty())last=subtrees[1][0].second;
    }else{
        if(subtrees[0].size()+subtrees[1].size()<subtrees[2].size())bad=true;
    }
 
    for(int i=0;i<n-1;i++){
 
        int maxs=0,sum=0;
 
        for(int f=0;f<subtrees.size();f++){
            maxs=max(maxs,int(subtrees[f].size()));
            sum+=subtrees[f].size();
        }
 
        if(subtrees.size()==3 and maxs*2==sum){
            sort(subtrees.begin(),subtrees.end(),cmp);
 
            for(pair<int,int> i:subtrees[1])subtrees[0].push_back(i);
            sort(subtrees[0].begin(),subtrees[0].end());
 
            if(!subtrees[1].empty() and last==subtrees[1][0].second){
                last=subtrees[0][0].second;
            }
 
            subtrees[1]=subtrees[2];
            subtrees.pop_back();
        }
 
        int best=-1;
        for(int f=0;f<subtrees.size();f++){
            if(subtrees[f].empty() or last==subtrees[f][0].second)continue;
            if(best==-1 or subtrees[f].back().first>subtrees[best].back().first)best=f;
            if(subtrees[f].back().first==subtrees[best].back().first and subtrees[f].size()>subtrees[best].size())best=f;
        }
    
        if(best==-1){
            if(subtr==3 and bad)return {};
        }
 
        perm.push_back(subtrees[best].back().second);
        last=subtrees[best][0].second;
        subtrees[best].pop_back();
    }
 
    perm.push_back(centroid);
 
    return perm;
}

Compilation message (stderr)

fun.cpp: In function 'std::vector<int> createFunTour(int, int)':
fun.cpp:32:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |         for(int f=0;f<subtrees.size();f++){
      |                     ~^~~~~~~~~~~~~~~~
fun.cpp:33:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |             if(f==subtrees.size()-1){
      |                ~^~~~~~~~~~~~~~~~~~~
fun.cpp:46:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |     for(int i=0;i<subtrees.size();i++){
      |                 ~^~~~~~~~~~~~~~~~
fun.cpp:66:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   66 |         for(int f=0;f<subtrees.size();f++){
      |                     ~^~~~~~~~~~~~~~~~
fun.cpp:86:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   86 |         for(int f=0;f<subtrees.size();f++){
      |                     ~^~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 16 / 16
• Subtask 3: 21 / 21
• Subtask 4: 19 / 19
• Subtask 5: 0 / 34