Submission #952785

#	Time	Username	Problem	Language	Result	Execution time	Memory
952785		emad234	Connecting Supertrees (IOI20_supertrees)	C++17	0 / 100	1 ms	348 KiB

supertrees

#include "supertrees.h"
#include <bits/stdc++.h>
#define ll long long
#define F first
#define S second
#define pii pair<ll, ll>
const ll mod = 1e9 + 7;
const ll mxN = 1e6 + 5;
using namespace std;

int dsu[mxN];
int find(int x) { return dsu[x] == x ? x : dsu[x] = find(dsu[x]); }
void merge(int a, int b) { dsu[find(b)] = find(a); }
int construct(std::vector<std::vector<int>> p)
{
	vector<vector<int>> b;
	int n = p.size(), m = p.size();
	b.resize(n);
	for (int i = 0; i < n; i++)
		dsu[i] = i;
	for (int i = 0; i < n; i++)
		b[i].resize(m);
	for (int i = 0; i < n; i++)
	{
		for (int j = 0; j < m; j++)
		{
			if (i == j)
				continue;
			if (p[i][j] == 1)
			{
				if (find(i) != find(j))
				{
					merge(i, j);
					b[i][j] = 1;
					b[j][i] = 1;
				}
			}
		}
	}
	vector<vector<int>> ty;
	vector<set<int>> v,v1;
	v.resize(n);
	ty.resize(n);
	for (int i = 0; i < n; i++)
	{
		ty[i].resize(n);
		for (int j = 0; j < m; j++)
		{
			ty[i][j] = -1;
		}
	}
	for (int i = 0; i < n; i++)
	{
		for (int j = 0; j < m; j++)
		{
			if (i == j)
				continue;
			if (find(i) == find(j))
			{
				if (p[i][j] != 1)
					return 0;
			}
			else
			{
				if (ty[find(i)][find(j)] != -1 && p[i][j] != ty[find(i)][find(j)])
					return 0;
				if (p[i][j] == 2)
				{
					v[find(i)].insert(find(j));
					v[find(j)].insert(find(i));
				}
				if (p[i][j] == 3)
				{
					v1[find(i)].insert(find(j));
					v1[find(j)].insert(find(i));
				}
				ty[find(i)][find(j)] = p[i][j];
			}
		}
	}
	vector<bool> vis(n);
	for (int i = 0; i < n; i++)
	{
		vector<bool>fnd(n);
		int prv = -1;
		if (vis[i])
			continue;
		if (v[i].size() == 1)
			return 0;
		v[i].insert(i);
		for(auto x : v[i]){
			fnd[x] = 1;
			for(auto y : v[x]){
				fnd[y] = 1;
			}
		}
		for (auto x : v[i])
		{
			for (int j = 0; j < n; j++)
			{
				if (x == j)
					continue;
				if (fnd[j] && p[x][j] != 2)
					return 0;
			}
			vis[x] = 1;
			if (prv != -1)
			{
				b[x][prv] = 1;
				b[prv][x] = 1;
			}
			prv = x;
		}
		if (v[i].size() >= 2)
		{
			b[*v[i].begin()][*v[i].rbegin()] = 1;
			b[*v[i].rbegin()][*v[i].begin()] = 1;
		}
	}
	for(int i = 0;i < n;i++) vis[i] = 0;
	for (int i = 0; i < n; i++)
	{
		vector<bool> fnd(n);
		int prv = -1;
		if (vis[i])
			continue;
		if (v1[i].size() == 1)
			return 0;
		v1[i].insert(i);
		for (auto x : v1[i])
		{
			fnd[x] = 1;
			for (auto y : v1[x])
			{
				fnd[y] = 1;
			}
		}
		int bg;
		int ed = *v1[i].begin();
		bg = ed;
		ed++;
		ed++;
		for (auto x : v1[i])
		{
			for (int j = 0; j < n; j++)
			{
				if (x == j)
					continue;
				if (fnd[j] && p[x][j] != 3)
					return 0;
			}
			vis[x] = 1;
			if (prv != -1)
			{
				b[x][prv] = 1;
				b[prv][x] = 1;
			}
			prv = x;
		}
		b[*v[i].begin()][*v[i].rbegin()] = 1;
		b[*v[i].rbegin()][*v[i].begin()] = 1;
		b[bg][ed] = 1;
		b[ed][bg] = 1;
	}
	build(b);
	return 1;
}

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