Submission #622852

#	Time	Username	Problem	Language	Result	Execution time	Memory
622852		PanTkd	Connecting Supertrees (IOI20_supertrees)	C++14	0 / 100	1 ms	296 KiB

supertrees

//
//  main.cpp
//
//  Created by Panagiotis Chadjicostas on
//  Copyright © Panagiotis Hadjicostas. All rights reserved.
//
#include "supertrees.h"

#include <iostream>
#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <fstream>
#include <iomanip>
#include <iterator>
#include <limits>
#include <list>
#include <cstring>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>
#include <unordered_map>

using namespace std;

typedef int ll;
typedef vector<ll> vi;
typedef pair<ll,ll> ii;
#define fo(i,a,b) for(int i = a; i<=b; i++)
#define f(i,b) for(int i=0;i<b;i++)
#define F first
#define S second
#define sz size
#define ls s,m,idx<<1
#define rs m+1,e,idx<<1|1
const ll MOD=ll(1e9)+7;
const ll MAXN=2*ll(1e6);
void checker(){
    ll n=rand()%20+2;
    vi a(n,ll());
    for(ll i=0;i<n;i++){
        a[i]=rand()%20+2;
    }
    for(ll b=0;b<(1<<n);b++){
        vi on,off;
        for(ll i=0;i<n;i++){
            if(i&(1<<i)){
                on.push_back(i);
            }
            else{
                off.push_back(i);
            }
        }
    }
}
///////////////////////////////////////////////////////////////////////
void build(vector<vector<ll> > b);
vi parent ;
int find(int x){
    if(parent[x]==x)
        return x;
    parent[x]=find(parent[x]);
    return parent[x];
}
void onion(int x, int y){
    parent[find(y)]=find(x);
    return;
}
vector<vi> A,B;
vi V;
void dfs(ll p,ll s){
    B[p].push_back(s);
    V[s]=1;

    for(auto x:A[s])
        if(!V[x])
            dfs(p,x);
}
int construct(vector<vector<ll> > p)
{
    ll s=0;
    ll n=p.size();
    vector<vector<ll> > ans (n, vector<int>(n, 0));
    parent.assign(n,0);
    for(ll i=0;i<n;i++)
        parent[i]=i;
    
    for(ll i=0;i<n;i++)
        for(ll j=0;j<n;j++){
            if(p[i][j]==1){
                onion(i,j);
            }
            
        }
    
    for(ll i=0;i<n;i++)
        for(ll j=0;j<n;j++)
            if(i!=j)
                if(!p[i][j]&&parent[i]==parent[j])
                    return 0;
    
    V.assign(n,0);
    A.assign(n,vi());
    B.assign(n,vi());
    
    
    ll counter=0;
    for(ll i=0;i<n;i++){
        if(!V[i]){
            dfs(i,i);
            counter++;
        }
    }
    //cout<<"Vrika tosa diaforetika: "<<counter<<endl;

    
    
    /*
    for(ll i=0;i<n;i++){
        ll cur=-1;
        if(B[i].empty())continue;
    
        for(auto x:B[i]){
            for(auto y:B[i]){
                if(x!=y){
                    if(cur!=-1)
                        cur=p[x][y];
                    else if(p[x][y]!=cur)
                        return 0;
                }
            }
        }
    }*/

    for(ll i=0;i<n;i++){
        if(!B[i].empty()){
            if(B[i].size()<=2)return 0;
            if(p[i][B[i][1]]!=2)continue;
            for(ll j=0;j<B[i].size()-1;j++){
                ans[B[i][j]][B[i][j+1]]=1;
                ans[B[i][j+1]][B[i][j]]=1;
            }
            ans[B[i][0]][B[i][B[i].size()-1]]=1;
            ans[B[i][B[i].size()-1]][B[i][0]]=1;
        }
    }
    build(ans);
    return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:143:25: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  143 |             for(ll j=0;j<B[i].size()-1;j++){
      |                        ~^~~~~~~~~~~~~~
supertrees.cpp:85:8: warning: unused variable 's' [-Wunused-variable]
   85 |     ll s=0;
      |        ^

• Subtask 1: 0 / 11
• Subtask 2: 0 / 10
• Subtask 3: 0 / 19
• Subtask 4: 0 / 35
• Subtask 5: 0 / 21
• Subtask 6: 0 / 4