Submission #1291632

#	Time	Username	Problem	Language	Result	Execution time	Memory
1291632		kahoul	Connecting Supertrees (IOI20_supertrees)	C++20	21 / 100	99 ms	22156 KiB

supertrees

#include "supertrees.h"
#include <bits/stdc++.h>
using namespace std;

const int maxn = 1e3 + 10;
int parent[maxn];

int find (int u) {
	if (parent[u] == u) return u;
	return parent[u] = find(parent[u]);
}

void onion (int u, int v) {
	u = find(u);
	v = find (v);
	if (u == v) return;
	parent[max(u, v)] = min(u, v);
}

int construct(vector<vector<int>> p) {
	int n = p.size();

	for (int i = 0; i < n; i++) {
		parent[i] = i;
	}

	vector<vector<int>> answer;

	for (int i = 0; i < n; i++) {
		vector<int> row(n, 0);
		answer.push_back(row);
	}

	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			if (p[i][j] == 1) {
				onion(i, j);
			} else {
				if (find(i) == find(j)) return 0;
			}
		}
	}

	for (int i = 0; i < n; i++) {
		answer[i][parent[i]] = 1;
		answer[parent[i]][i] = 1;
		answer[i][i] = 0;
	}

	build(answer);
	return 1;
}

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