Submission #416490

#	Time	Username	Problem	Language	Result	Execution time	Memory
416490		ioi	Connecting Supertrees (IOI20_supertrees)	C++14	11 / 100	305 ms	22152 KiB

supertrees

#include "supertrees.h"
#include <vector>
#include<bits/stdc++.h>
using namespace std ;
const int N = 1002;
int dsu[N] , sz[N];

int get(int u){
    if(u == dsu[u])
        return u ;

    return dsu[u] = get(dsu[u]);



}

void connect(int u , int v){


    u = get(u) , v = get(v);
    if(u == v)return ;

    if(sz[u] > sz[v])swap(u , v);

    sz[v] += sz[u];

    dsu[u] = v ;



}

bool same(int u , int v){
    u = get(u) , v = get(v);

    return u == v ;

}
int construct(vector<vector<int>> p) {
	int n = p.size();
	vector<vector<int>> answer (n , vector<int> (n , 0));
    for(int i = 0 ; i < n ; i ++)sz[i] = 1 , dsu[i] = i ;
    int mx[n] = {} , cnt[n] = {} , cnt1[n] = {};

    for(int i = 0 ; i < n ; i ++){
        for(int j = 0 ; j < n ; j ++){
            if(p[i][j])connect(i , j);
            if(i == j)continue;
            mx[i] = max(mx[i] , p[i][j]);
            mx[j] = max(mx[j] , p[i][j]);
            cnt[i] += (p[i][j] == 2 );cnt1[i] += (p[i][j] == 1);

        }
    }
    map<int, set<int> > mp ;


    for(int i = 0 ; i < n ; i ++){
        for(int j = 0 ; j < n ;j ++)
        {
           // if(p[i][j] == 0&& same(i , j) || (p[i][j] && sz[get(dsu[i])] == 2))return 0 ;
             if(p[i][j] && i != j)mp[dsu[i]].insert(i) , mp[dsu[i]].insert(j);

        }
    }
    for(auto f : mp){

         int node = - 1 ;

         vector<int> v , el ;

         for(auto ff : f.second){
            if(!cnt1[ff])v.push_back(ff);
            else el.push_back(ff);
            //if(cnt[ff] && cnt1[ff])v.push_back()
         }
         for(auto ff : el){
            if(cnt1[ff] == f.second.size() - 1 - v.size()){
                node = ff ;
                v.push_back(ff);

                break;
            }
         }
         if(v.empty()){

            int past = *(f.second.begin()) ;
            auto p = f.second .begin() ; p ++ ;

            for(int i = 1  ; i < f.second.size() ; i ++){
                answer[past][*p] = answer[*p][past] = 1 ;
                past = *p ;
                p ++ ;
            }

            continue ;
         }

         int past = v[0];
         for(int i = 1 ; i < v.size() ; i ++){
            answer[past][v[i]] = answer[v[i]][past] = 1 ;
            past = v[i];

         }

         if(v.size() > 1)answer[v[0]][v[v.size() - 1]] = answer[v[v.size() - 1]][v[0]] = 1 ;

         v.clear();
         if(~node){
            for(auto ff : el){
                if(ff != node)v.push_back(ff);

            }

            past = v[0];
            for(int i = 1 ; i < v.size() ; i ++){

                answer[past][v[i]] = answer[v[i]][past] = 1 ;
                past = v[i];
            }
            if(past != node)answer[past][node] = answer[node][past] = 1 ;

         }


    }



	build(answer);
	return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:79:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::set<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   79 |             if(cnt1[ff] == f.second.size() - 1 - v.size()){
      |                ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
supertrees.cpp:91:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::set<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   91 |             for(int i = 1  ; i < f.second.size() ; i ++){
      |                              ~~^~~~~~~~~~~~~~~~~
supertrees.cpp:101:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  101 |          for(int i = 1 ; i < v.size() ; i ++){
      |                          ~~^~~~~~~~~~
supertrees.cpp:117:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  117 |             for(int i = 1 ; i < v.size() ; i ++){
      |                             ~~^~~~~~~~~~

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