Submission #1041514

#	Time	Username	Problem	Language	Result	Execution time	Memory
1041514		vjudge1	Izlet (COI19_izlet)	C++17	43 / 100	366 ms	55964 KiB

izlet

/*
بسم الله الرحمن الرحيم
Author:
                          (:Muhammad Aneeq:)
*/

#include <iostream>
#include <vector>
using namespace std;
int const N=3e3+10;
int par[N]={};
bool vis[N][N]={};
vector<int>mem[N]={};
int a[N][N]={};
int root(int n)
{
	if (par[n]==n) return n;
	return (par[n]=root(par[n]));
}
bool merge_able(int c,int b)
{
	if (vis[c][b])
		return 0;
	vis[c][b]=1;
	for (auto i:mem[c])
	{
		for (auto j:mem[b])
		{
			int u=i,v=j;
			if (u>v)
				swap(u,v);
			if (a[u][v-1]!=a[u][v])
				return 0;
		}
	}
	return 1;
}
void merge(int a,int b)
{
	a=root(a);b=root(b);
	if (a==b)
		return;
	if (merge_able(a,b)==0)
		return ;
	for (auto i:mem[b])
		mem[a].push_back(i);
	mem[b]={};
	par[b]=a;
}
inline void solve()
{
	int subt;
	cin>>subt;
	int n;
	cin>>n;
	for (int i=0;i<n;i++)
		par[i]=i,mem[i].push_back(i);
	for (int i=0;i<n;i++)
		for (int j=0;j<n;j++)
			cin>>a[i][j];
	if (subt==2)
	{
		for (int i=1;i<n;i++)
		{
			for (int j=0;j<n-i;j++)
			{
				merge(j,i+j);
			}
		}
		for (int i=0;i<n;i++)
			cout<<root(i)+1<<' ';
		cout<<endl;
		for (int i=1;i<n;i++)
			cout<<i<<' '<<i+1<<endl;
	}
	if (subt==1)
	{
		vector<vector<int>>ans;
		for (int i=0;i<n;i++)
		{
			for (int j=i+1;j<n;j++)
			{
				if (a[i][j]==1)
				{
					int a=i,b=j;
					a=root(a),b=root(b);
					if (a==b)
						continue;
					par[b]=a;
					ans.push_back({a,b});
					for (auto i:mem[b])
						mem[a].push_back(i);
					mem[b]={};
				}
			}
		}
		int an[n]={};
		vector<int>z;
		for (int i=0;i<n;i++)
			if (root(i)==i)
				z.push_back(i);
		for (int i=1;i<z.size();i++)
		{
			ans.push_back({z[i],z[0]});
			for (auto j:mem[z[i]])
				an[j]=2;
		}
		for (auto i:mem[z[0]])
			an[i]=1;
		for (auto i:an)
			cout<<i<<' ';
		cout<<endl;
		for (auto i:ans)
			cout<<i[0]+1<<' '<<i[1]+1<<endl;
	}
}
int main()
{
    ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
        solve();
}

Compilation message (stderr)

izlet.cpp: In function 'void solve()':
izlet.cpp:102:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  102 |   for (int i=1;i<z.size();i++)
      |                ~^~~~~~~~~

• Subtask 1: 18 / 18
• Subtask 2: 25 / 25
• Subtask 3: 0 / 57