Submission #678932

#	Time	Username	Problem	Language	Result	Execution time	Memory
678932		penguin133	Connecting Supertrees (IOI20_supertrees)	C++17	40 / 100	209 ms	22392 KiB

supertrees

#include <bits/stdc++.h>
#include "supertrees.h"
using namespace std;
 
//#define int long long
#define pi pair<int, int>
#define pii pair<int, pi>
#define fi first
#define se second
#ifdef _WIN32
#define getchar_unlocked _getchar_nolock
#endif
 
int par[1005], par2[1005];
vector<int> stuf[1005];
int getr(int x){
	return (par[x] == x ? x : par[x] = getr(par[x]));
}
int g2(int x){
	return (par2[x] == x ? x : par2[x] = g2(par2[x]));
}
 
void m2(int a, int b){
	a = g2(a), b = g2(b);
	if(a != b)par2[b] = a;
}
void merge(int a, int b){
	a = getr(a), b = getr(b);
	if(a != b)par[b] = a;
}
int construct(std::vector<std::vector<int>> p) {
	int n = p.size();
	for(int i=0;i<n;i++)par[i] = i;
	std::vector<std::vector<int>> ans;
	for (int i = 0; i < n; i++) {
		std::vector<int> row(n, 0);
		ans.push_back(row);
	}
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++){
			if(p[i][j])merge(i, j);
		}
	}
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++){
			if(!p[i][j] && getr(i) == getr(j))return 0;
		}
	}
	for(int i=0;i<n;i++){
		vector<int> pos;
		for(int j=0;j<n;j++)if(getr(j) == i)pos.push_back(j);
		vector<int> pos2, pos3;
		for(auto j : pos){
			bool f = 1;
			for(auto k : pos){
				if(j == k)continue;
				if(p[j][k] != 2)f =0 ;
			}
			if(f)pos2.push_back(j);
			else {
				pos3.push_back(j);
				for(auto k : pos)if(p[j][k] == 1)m2(j, k);
			}
		}
		if((int)pos.size() <= 1)continue;
		if(((int)pos2.size() == 2 && (int)pos.size() == 2))return 0;
		for(int j=0;j<(int)pos2.size() - 1;j++){
			ans[pos2[j]][pos2[j+1]] = 1;
			ans[pos2[j+1]][pos2[j]] = 1;
		}
		if((int)pos.size() == (int)pos2.size() && (int)pos2.size() > 2){		
			ans[pos2[0]][pos2[(int)pos2.size() - 1]] = 1;
			ans[pos2[(int)pos2.size() - 1]][pos2[0]] = 1;
		}
		else if(pos2.empty()){
			for(int j=0;j<(int)pos3.size() - 1;j++){
				ans[pos3[j]][pos3[j+1]] = 1;
				ans[pos3[j+1]][pos3[j]] = 1;
			}
		}
		else if((int)pos.size() != (int)pos2.size()){
			for(int j=0;j<n;j++)stuf[j].clear();
			set <int> s;
			for(auto j : pos3){
				stuf[g2(j)].push_back(j);
				s.insert(g2(j));
			}
			if((int)s.size() == 1 && (int)pos2.size() == 1)return 0;
			int c1 = -1, c2 = -1;
          	if((int)s.size() > 2)return 0;
			for(auto j : s){
				for(int k=0;k<(int)stuf[j].size()-1;k++){
					ans[stuf[j][k]][stuf[j][k+1]] = 1;
					ans[stuf[j][k+1]][stuf[j][k]] = 1;
				}
				
				if(c1 == -1){
					ans[stuf[j][0]][pos2[0]] = 1;
					ans[pos2[0]][stuf[j][0]] = 1;
				}
				else{
					c2 = j;
                  	ans[stuf[j][0]][pos2[(int)pos2.size()-1]] = 1;
					ans[pos2[(int)pos2.size()-1]][stuf[j][0]] = 1;
				}
			}
			if((int)s.size() > 1){
				ans[stuf[c1][0]][stuf[c2][0]] = 1;
				ans[stuf[c2][0]][stuf[c1][0]] = 1;
			}
			else{
				ans[stuf[c1][0]][pos2[(int)pos2.size()-1]] = 1;
				ans[pos2[(int)pos2.size()-1]][stuf[c1][0]] = 1;
			}
			/*
			for(int j=0;j<(int)pos3.size() - 1;j++){
				ans[pos3[j]][pos3[j+1]] = 1;
				ans[pos3[j+1]][pos3[j]] = 1;
			}
			if(!pos2.empty()){
				ans[pos3[0]][pos2[0]] = 1;
				ans[pos2[0]][pos3[0]] = 1;
				ans[pos3[0]][pos2[(int)pos2.size()-1]] = 1;
				ans[pos2[(int)pos2.size()-1]][pos3[0]] = 1;
			}
			*/
		}
		for(int j=0;j<n;j++)par2[j] = j;
	}
	
	build(ans);
	return 1;
}

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