Submission #1270725

#	Time	Username	Problem	Language	Result	Execution time	Memory
1270725		Jawad_Akbar_JJ	Connecting Supertrees (IOI20_supertrees)	C++17	56 / 100	109 ms	26184 KiB

supertrees

#include <iostream>
#include <vector>
#include <algorithm>
#include "supertrees.h"

using namespace std;
const int M = 1005;
vector<int> nei[M];
int seen[M], par[M], Ways[M][M], Dfs[M];

int root(int v){
	return (par[v] == -1 ? v : par[v] = root(par[v]));
}

void dfs(int u, int rt){
	Dfs[u] = 1;
	Ways[rt][u]++;

	for (int i : nei[u]){
		if (Dfs[i] == 1)
			continue;
		dfs(i, rt);
	}
	Dfs[u] = 0;
}

int construct(vector<vector<int>> p){
	int n = p.size();
	for (int i=0;i<n;i++)
		par[i] = -1;
	vector<vector<int>> Edge(n, vector<int> (n, 0));

	for (int i=0;i<n;i++){
		for (int j=i+1;j<n;j++){
			if (root(i) != root(j) and p[i][j] == 1){
				Edge[i][j] = Edge[j][i] = 1;
				par[root(j)] = root(i);
				nei[i].push_back(j);
				nei[j].push_back(i);
			}
		}
	}

	for (int i=0;i<n;i++){
		if (seen[root(i)])
			continue;

		seen[root(i)] = 1;
		int lst = i;
		for (int j=0;j<n;j++){
			if (p[i][j] == 2 and seen[root(j)] == 0){
				nei[lst].push_back(j);
				nei[j].push_back(lst);
				Edge[lst][j] = Edge[j][lst] = 1;
				lst = j;
				seen[root(j)] = 1;
			}
		}
		if (lst != i){
			nei[lst].push_back(i);
			nei[i].push_back(lst);
			Edge[lst][i] = Edge[i][lst] = 1;
		}
	}

	for (int i=0;i<n;i++)
		dfs(i, i);
	
	for (int i=0;i<n;i++){
		for (int j=0;j<n;j++)
			if (Ways[i][j] != p[i][j])
				return 0;
	}

	build(Edge);
	return 1;
}

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