oj.uz

Submission #1002313

# Submission time Handle Problem Language Result Execution time Memory
1002313 2024-06-19T12:23:38 Z toast12 Connecting Supertrees (IOI20_supertrees) C++14
19 / 100
 136 ms 24148 KB 
#include "supertrees.h"
#include <vector>
#include <map>
#include <iostream>
using namespace std;

struct DSU {
	int n;
	vector<int> link, size;
	DSU(int sz) {
		n = sz;
		link.resize(sz);
		size.resize(sz);
		for (int i = 0; i < n; i++) {
			link[i] = i;
			size[i] = 1;
		}
	}
	int find(int x) {
		while (x != link[x])
			x = link[x];
		return x;
	} 
	bool same(int a, int b) {
		return find(a) == find(b);
	}
	void unite(int a, int b) {
		a = find(a);
		b = find(b);
		if (a == b)
			return;
		if (size[a] < size[b])
			swap(a, b);
		link[b] = a;
		size[a] += size[b];
	}
};

int construct(std::vector<vector<int>> p) {
	int n = p.size();
	vector<vector<int>> answer(n, vector<int>(n));
	vector<vector<int>> c(n);
	DSU d(n+1);
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			if (i == j)
				continue;
			if (p[i][j]) {
				if (!d.same(i, j)) {
					d.unite(i, j);
					int x = d.find(i);
					c[x].push_back(j);
					c[x].push_back(i);
				}
			}
		}
	}
	// for (int i = 0; i < n; i++) {
	// 	cout << i << ": ";
	// 	for (auto x : c[i])
	// 		cout << x << ' ';
	// 	cout << '\n';
	// }
	for (int i = 0; i < n; i++) {
		if (c[i].empty())
			continue;
		if (c[i].size() == 2)
			return 0;
		vector<bool> done(n);
		vector<int> x;
		for (int j = 0; j < (int)c[i].size(); j++) {
			if (!done[c[i][j]])
				x.push_back(c[i][j]);
         	done[c[i][j]] = true;
			for (int k = j+1; k < (int)c[i].size(); k++) {
				if (!p[c[i][j]][c[i][k]])
					return 0;
			}
		}
		for (int j = 0; j < (int)x.size()-1; j++) {
			answer[x[j]][x[j+1]] = 1;
			answer[x[j+1]][x[j]] = 1;
		}
		answer[x[0]][x.back()] = 1;
		answer[x.back()][x[0]] = 1;
	}
	build(answer);
	return 1;
}

Subtask #1
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Incorrect 1 ms 348 KB Answer gives possible 0 while actual possible 1
3 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Incorrect 1 ms 348 KB Answer gives possible 0 while actual possible 1
3 Halted 0 ms 0 KB -

Subtask #3
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 432 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 6 ms 1372 KB Output is correct
9 Correct 118 ms 24060 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 5 ms 1372 KB Output is correct
13 Correct 136 ms 24060 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 3 ms 860 KB Output is correct
17 Correct 65 ms 14204 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 28 ms 6284 KB Output is correct
22 Correct 114 ms 23984 KB Output is correct
23 Correct 111 ms 24144 KB Output is correct
24 Correct 119 ms 24148 KB Output is correct
25 Correct 50 ms 14212 KB Output is correct
26 Correct 49 ms 14160 KB Output is correct
27 Correct 111 ms 24148 KB Output is correct
28 Correct 118 ms 24144 KB Output is correct
29 Correct 52 ms 14092 KB Output is correct

Subtask #4
0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Incorrect 0 ms 440 KB Too many ways to get from 1 to 3, should be 1 found no less than 2
4 Halted 0 ms 0 KB -

Subtask #5
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Incorrect 1 ms 348 KB Answer gives possible 0 while actual possible 1
3 Halted 0 ms 0 KB -

Subtask #6
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Incorrect 1 ms 348 KB Answer gives possible 0 while actual possible 1
3 Halted 0 ms 0 KB -