Submission #319761

#	Time	Username	Problem	Language	Result	Execution time	Memory
319761		NicolaAbusaad2014	Connecting Supertrees (IOI20_supertrees)	C++14	19 / 100	276 ms	22372 KiB

supertrees

#include "supertrees.h"
#include <bits/stdc++.h>
using namespace std;
vector<long>parent;
std::vector<std::vector<int> > answer;
long find_set(long x)
{
    if(parent[x]==x){
        return x;
    }
    long z=find_set(parent[x]);
    parent[x]=z;
    return z;
}
void union_set(long x,long z)
{
    x=find_set(x);
    z=find_set(z);
    if(x!=z){
        parent[z]=x;
    }
}
int construct(std::vector<std::vector<int> > p) {
	int n = p.size();
	for(long i=0;i<n;i++){
        parent.push_back(i);
	}
	for (int i = 0; i < n; i++) {
		std::vector<int> row;
		row.resize(n);
		answer.push_back(row);
	}
	bool ok=true;
	for(long i=0;i<n;i++){
        for(long j=i+1;j<n;j++){
            if(p[i][j]!=0){
                union_set(i,j);
            }
        }
	}
	for(long i=0;i<n;i++){
        for(long j=i+1;j<n;j++){
            if(p[i][j]==0){
                if(find_set(i)==find_set(j)){
                    ok=false;
                    i=n;
                    break;
                }
            }
        }
	}
	vector<vector<long> >v(n);
	long x,z;
	for(long i=0;i<n;i++){
        x=find_set(i);
        v[x].push_back(i);
	}
	for(long i=0;i<n;i++){
        x=v[i].size();
        if(x>2){
            for(long j=0;j<x;j++){
                z=(j+1)%x;
                answer[v[i][z]][v[i][j]]=1;
                answer[v[i][j]][v[i][z]]=1;
            }
        }
        else if(x==2){
            ok=false;
            break;
        }
	}
	if(ok){
        build(answer);
        return 1;
	}
    return 0;
}

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