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Submission #301016

# Submission time Handle Problem Language Result Execution time Memory
301016 2020-09-17T15:53:13 Z ElyesChaabouni Connecting Supertrees (IOI20_supertrees) C++14
0 / 100
 1 ms 256 KB 
#include "supertrees.h"
#include <bits/stdc++.h>

using namespace std;

int anc[200000], anc1[200000];
void get_anc(int x)
{
	int cu=anc[x];
	while(cu!=anc[cu])
		cu=anc[cu];
	anc[x]=cu;
}
void unite(int x, int y)
{
	get_anc(x);
	get_anc(y);
	anc[anc[y]]=anc[x];
	anc[y]=anc[x];
}
void get_anc1(int x)
{
	int cu=anc1[x];
	while(cu!=anc1[cu])
		cu=anc1[cu];
	anc1[x]=cu;
}
void unite1(int x, int y)
{
	get_anc1(x);
	get_anc1(y);
	anc1[anc1[y]]=anc1[x];
	anc1[y]=anc1[x];
}
int construct(std::vector<std::vector<int>> p) {
	int n = p.size();
	std::vector<std::vector<int>> ans;
	for (int i = 0; i < n; i++) {
		std::vector<int> row;
		row.resize(n);
		ans.push_back(row);
	}
	for(int i = 0; i < n; i++)
		for(int j = 0; j < n; j++)
			ans[i][j]=0;
	for(int i = 0; i < n; i++)
	{
		for(int j = 0; j < n; j++)
		{
			if(p[i][j]==1)
				unite(i, j);
		}
	}
	for(int i = 0; i < n; i++)
	{
		for(int j = 0; j < n; j++)
		{
			get_anc(i);
			get_anc(j);
			if((anc[i]==anc[j] && p[i][j]!=1 )||(anc[i]!=anc[j] && p[i][j]==1 ))
				return 0;
			if(p[i][j]==3)
				return 0;
		}
	}
	for(int i = 0; i < n; i++)
	{
		vector<int>v;
		for(int j = 0; j < n; j++)
		{
			if(anc[j]==i)
				v.push_back(j);
		}
		for(int j = 0; j < (int)(v.size())-1; j++)
		{
			ans[v[j]][v[j+1]]=1;
			ans[v[j+1]][v[j]]=1;
		}
	}
	for(int i = 0; i < n; i++)
		anc1[i]=-1;
	for(int i = 0; i < n; i++)
	{
		bool found=0;
		for(int j = 0; j < n && !found; j++)
		{
			if(anc[j]==i)
				found=1;
		}
		if(found)
			anc1[i]=i;
	}
	for(int i = 0; i < n; i++)
	{
		for(int j = 0; j < n; j++)
		{
			if(p[i][j]==2)
			{
				get_anc(i);
				get_anc(j);
				unite1(anc[i], anc[j]);
			}
		}
	}
	for(int i = 0; i < n; i++)
	{
		vector<int>v;
		for(int j = 0; j < n; j++)
		{
			if(anc1[j]==i)
				v.push_back(j);
		}
		for(int j = 0; j < (int)(v.size())-1; j++)
		{
			ans[v[j]][v[j+1]]=1;
			ans[v[j+1]][v[j]]=1;
		}
		if(v.size() == 2)
			return 0;
		ans[v[0]][v[n-1]]=1;
		ans[v[n-1]][v[0]]=1;
	}
	build(ans);
	return 1;
}

Subtask #1
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 256 KB b[0][0] is not 0
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 256 KB b[0][0] is not 0
2 Halted 0 ms 0 KB -

Subtask #3
0 / 19.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 256 KB Answer gives possible 0 while actual possible 1
2 Halted 0 ms 0 KB -

Subtask #4
0 / 35.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 256 KB Answer gives possible 0 while actual possible 1
2 Halted 0 ms 0 KB -

Subtask #5
0 / 21.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 256 KB b[0][0] is not 0
2 Halted 0 ms 0 KB -

Subtask #6
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 256 KB b[0][0] is not 0
2 Halted 0 ms 0 KB -