Submission #300667

#	Time	Username	Problem	Language	Result	Execution time	Memory
300667		Kerim	Connecting Supertrees (IOI20_supertrees)	C++17	40 / 100	258 ms	22392 KiB

supertrees

#include "supertrees.h"
#include "bits/stdc++.h"
#define MAXN 100009
#define INF 1000000007
#define mp(x,y) make_pair(x,y)
#define all(v) v.begin(),v.end()
#define pb(x) push_back(x)
#define wr cout<<"----------------"<<endl;
#define ppb() pop_back()
#define tr(ii,c) for(__typeof((c).begin()) ii=(c).begin();ii!=(c).end();ii++)
#define ff first
#define ss second
#define my_little_dodge 46
#define debug(x)  cerr<< #x <<" = "<< x<<endl;
using namespace std;

typedef long long ll;
typedef pair<int,int> PII;
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
int vis[MAXN];
int construct(std::vector<std::vector<int>> p) {
	int n = p.size();
	std::vector<std::vector<int>> answer;
	for (int i = 0; i < n; i++) {
		std::vector<int> row;
		row.resize(n);
		answer.push_back(row);
	}int mx=0;
	for(int i=0;i<n;i++)
		for(int j=0;j<n;j++)
			umax(mx,p[i][j]);
	if(mx==0){
		build(answer);
		return 1;	
	}
	if(mx==1){
		int cnt=0;
		for(int i=0;i<n;i++)
			if(!vis[i]){vis[i]=++cnt;
				for(int j=i+1;j<n;j++)
					if(!vis[j] and p[i][j])
						answer[i][j]=answer[j][i]=1,vis[j]=cnt;
			}
		for(int i=0;i<n;i++)
			for(int j=0;j<n;j++)
				if(p[i][j] and vis[i]!=vis[j])
					return 0;
		for(int i=0;i<n;i++)
			for(int j=0;j<n;j++)
				if(vis[i]==vis[j] and !p[i][j])
					return 0;
		build(answer);
		return 1;
	}
	if(mx==2){
		vector<int>cur;int cnt=0;
		for(int i=0;i<n;i++)
			if(!vis[i]){
				cur.clear();
				vis[i]=++cnt;cur.pb(i);
				for(int j=i+1;j<n;j++)
					if(!vis[j] and p[i][j])
						vis[j]=cnt,cur.pb(j);
				if(int(cur.size())==1)
					continue;
				if(int(cur.size())==2)
					return 0;
				for(int j=0;j<int(cur.size());j++)
					answer[cur[j]][cur[(j+1)%int(cur.size())]]=answer[cur[(j+1)%int(cur.size())]][cur[j]]=1;
			}
		for(int i=0;i<n;i++)
			for(int j=0;j<n;j++)
				if(p[i][j] and vis[i]!=vis[j])
					return 0;
		for(int i=0;i<n;i++)
			for(int j=0;j<n;j++)
				if(vis[i]==vis[j] and !p[i][j])
					return 0;
		build(answer);
		return 1;
	}
	return 0;
}

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