oj.uz

Submission #779136

# Submission time Handle Problem Language Result Execution time Memory
779136 2023-07-11T08:16:52 Z Josia Connecting Supertrees (IOI20_supertrees) C++17
0 / 100
 1 ms 212 KB 
#include "supertrees.h"
#include <vector>
#include <bits/stdc++.h>

using namespace std;




struct uf {
	vector<int> chefs;
	uf (int n) {
		chefs.resize(n);
		for (int i = 0; i<n; i++) chefs[i] = i;
	}

	int find(int x) {
		if (chefs[x] == x) return x;
		return chefs[x] = find(chefs[x]);
	}

	void unite(int a, int b) {
		a = find(a);
		b = find(b);

		chefs[a] = b;
	}
};




int construct(std::vector<std::vector<int>> p) {
	int n = p.size();
	if (n == 1) {
		if (p[0][0] == 1) {
			build({{0}});
			return 1;
		}
		return 0;
	}
	vector<vector<int>> answer(n, vector<int>(n));


	uf u(n);

	for (int i = 0; i<n; i++) {
		for (int j = 0; j<n; j++) {
			if (p[i][j]) u.unite(i, j);
		}
	}

	for (int i = 0; i<n; i++) {
		for (int j = 0; j<n; j++) {
			if ((bool)(p[i][j]) != (u.find(i) == u.find(j))) return 0;
		}
	}

	vector<vector<int>> vals(n);

	for (int i = 0; i<n; i++) {
		for (int j = 0; j<n; j++) {
			if (u.find(j) == i) vals[i].push_back(j);
		}
	}

	for (auto v: vals) {

		for (int i = 0; i<(int)(v.size()); i++) {
			answer[v[i]][v[(i+1)%v.size()]] = 1;
			answer[v[(i+1)%v.size()]][v[i]] = 1;
		}

	}

	build(answer);
	return 1;
}

Subtask #1
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Incorrect 0 ms 212 KB Too many ways to get from 0 to 2, should be 1 found no less than 2
4 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Incorrect 0 ms 212 KB Too many ways to get from 0 to 2, should be 1 found no less than 2
4 Halted 0 ms 0 KB -

Subtask #3
0 / 19.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB b[0][0] is not 0
2 Halted 0 ms 0 KB -

Subtask #4
0 / 35.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB b[0][0] is not 0
2 Halted 0 ms 0 KB -

Subtask #5
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Incorrect 0 ms 212 KB Too many ways to get from 0 to 2, should be 1 found no less than 2
4 Halted 0 ms 0 KB -

Subtask #6
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Incorrect 0 ms 212 KB Too many ways to get from 0 to 2, should be 1 found no less than 2
4 Halted 0 ms 0 KB -