Submission #1211593

#	Time	Username	Problem	Language	Result	Execution time	Memory
1211593		thelegendary08	Connecting Supertrees (IOI20_supertrees)	C++17	100 / 100	122 ms	22300 KiB

supertrees

#include "supertrees.h"
#include<bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define f0r(i,n) for(int i = 0; i<n; i++)
#define FOR(i, k, n) for(int i = k; i<n; i++)
#define vi vector<int>
#define vvi vector<vi>
#define pii pair<int,int>
#define vb vector<bool>
#define vout(v) for(auto u : v)cout<<u<<' '; cout<<'\n';
#define dout(x) cout<<x<<' '<<#x<<'\n';
using namespace std;
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);
	}
	build(answer);
	*/
	
	vvi ans(n, vi(n));
	vb vis(n);
	vi chain(n);
	int cnt = 0;
	vvi chains;
	f0r(i, n){
		if(!vis[i]){
			vi path;
			path.pb(i);
			chain[i] = cnt;
			vis[i] = 1;
			f0r(j, n){
				if(p[i][j] == 1 && !vis[j]){
					vis[j] = 1;
					chain[j] = cnt;
					path.pb(j);
				}
			}
			chains.pb(path);
			f0r(j, path.size() - 1){
				ans[path[j]][path[j+1]] = 1;
				ans[path[j+1]][path[j]] = 1;
			}
			cnt++;
		}
	}
	
	vb vc(chains.size());
	int m = chains.size();
	f0r(i,m){
		if(!vc[i]){
			vc[i] = 1;
			vi path;
			path.pb(chains[i][0]);
			f0r(j, m){
				if(!vc[j] && p[chains[i][0]][chains[j][0]] == 2){
					vc[j] = 1;
					path.pb(chains[j][0]);
				}
			}
			if(path.size() >= 2){
				f0r(j, path.size() - 1){
					ans[path[j]][path[j+1]] = 1;
					ans[path[j+1]][path[j]] = 1;
				}
				ans[path.back()][path[0]] = 1;
				ans[path[0]][path.back()] = 1;
			}
			
		}
	}
	
	vvi ccs;
	vi cc(n);
	f0r(i,n)vis[i] = 0;
	cnt = 0;
	f0r(i,n){
		if(!vis[i]){
			queue<int>q;
			q.push(i);
			vis[i] = 1;
			vi cur;
			cur.pb(i);
			cc[i] = cnt;
			while(!q.empty()){
				int node = q.front();
				q.pop();
				f0r(j, n){
					if(!vis[j] && p[node][j] > 0){
						q.push(j);
						vis[j] = 1;
						cur.pb(j);
						cc[j] = cnt;
					}
				}
			}
			ccs.pb(cur);
			cnt++;
		}
	}
	
	bool ok = 1;
	
	for(auto v : ccs){
		int s = v.size();
		// vout(v);
		for(auto i : v){
			for(auto j : v){
				if(p[i][j] == 0)ok = 0;
				if(chain[i] == chain[j] && p[i][j] != 1)ok = 0;
				if(chain[i] != chain[j] && p[i][j] != 2)ok = 0;
			}
		}
		set<int>thing;
		for(auto i : v){
			thing.insert(chain[i]);
		}
		if(thing.size() == 2)ok = 0;
	}
	
	
	if(!ok)return 0;
	
	build(ans);
	return 1;
}

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