oj.uz

Submission #300198

# Submission time Handle Problem Language Result Execution time Memory
300198 2020-09-17T00:20:33 Z VladaMG98 Connecting Supertrees (IOI20_supertrees) C++17
19 / 100
 259 ms 22360 KB 
#include "supertrees.h"
#include <bits/stdc++.h>
using namespace std;

struct dsu {
	int n;
	vector<int> parent, rank;
	dsu(int _n) {
		n = _n;
		parent.resize(n);
		rank.resize(n);
		for (int i = 0; i < n; i++) {
			parent[i] = i;
			rank[i] = 1;
		}
	}
	int get(int x) {
		if (parent[x] == x) return x;
		return parent[x] = get(parent[x]);
	}
	bool unite(int x, int y) {
		x = get(x), y = get(y);
		if (x == y) return false;
		if (rank[x] < rank[y]) swap(x, y);
		parent[y] = x;
		rank[x] += rank[y];
		return true;
	}
	vector<int> all_roots() {
		set<int> s;
		for (int i = 0; i < n; i++) s.insert(get(i));
		vector<int> res;
		for (auto &x : s) res.push_back(x);
		return res;
	}
};

void path(vector<vector<int>> &answer, vector<int> nodes) {
	if (nodes.size() == 1) return;
	for (int i = 1; i < (int)nodes.size(); i++) {
		answer[nodes[i - 1]][nodes[i]] = 1;
		answer[nodes[i]][nodes[i - 1]] = 1;
	}
}

void cycle(vector<vector<int>> &answer, vector<int> nodes) {
	if (nodes.size() == 1) return;
	path(answer, nodes);
	answer[nodes.back()][nodes[0]] = 1;
	answer[nodes[0]][nodes.back()] = 1;

}
int construct(vector<std::vector<int>> p) {
	int n = p.size();
	vector<vector<int>> answer;
	answer.resize(n);
	for (int i = 0; i < n; i++) {
		answer[i].resize(n);
		for (int j = 0; j < n; j++) {
			answer[i][j] = 0;
		}
	}
	dsu d(n);
	for (int i = 0; i < n; i++) {
		for (int j = i + 1; j < n; j++) {
			if (p[i][j] != p[j][i]) return 0;
			if (p[i][j] > 0) d.unite(i, j);
		}
	}
	vector<int> roots = d.all_roots();
	int roots_num = (int)roots.size();
	unordered_map<int, int> ind;
	for (int i = 0; i < roots_num; i++) {
		ind[roots[i]] = i;
	}
	vector<vector<int>> parts(roots_num);
	for (int i = 0; i < n; i++) {
		parts[ind[d.get(i)]].push_back(i);
	}
	for (int i = 0; i < roots_num; i++) {
		vector<int> &cur = parts[i];
		if (cur.size() == 2) return 0;
		int small_sz = (int)cur.size();
		for (	int j = 0; j < small_sz; j++) {
			for (int k = 0; k < small_sz; k++) {
				if (p[cur[j]][cur[k]] == 0) return 0;
			}
		}
		cycle(answer, cur);
	}
	build(answer);
	return 1;
}

Subtask #1
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 256 KB Output is correct
2 Incorrect 1 ms 256 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 1 ms 256 KB Output is correct
2 Incorrect 1 ms 256 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 1 ms 256 KB Output is correct
2 Correct 1 ms 256 KB Output is correct
3 Correct 1 ms 256 KB Output is correct
4 Correct 1 ms 256 KB Output is correct
5 Correct 1 ms 256 KB Output is correct
6 Correct 1 ms 256 KB Output is correct
7 Correct 1 ms 256 KB Output is correct
8 Correct 10 ms 1280 KB Output is correct
9 Correct 248 ms 22360 KB Output is correct
10 Correct 1 ms 256 KB Output is correct
11 Correct 1 ms 384 KB Output is correct
12 Correct 10 ms 1152 KB Output is correct
13 Correct 254 ms 22136 KB Output is correct
14 Correct 1 ms 256 KB Output is correct
15 Correct 1 ms 256 KB Output is correct
16 Correct 5 ms 768 KB Output is correct
17 Correct 119 ms 12152 KB Output is correct
18 Correct 1 ms 256 KB Output is correct
19 Correct 1 ms 256 KB Output is correct
20 Correct 1 ms 256 KB Output is correct
21 Correct 64 ms 5752 KB Output is correct
22 Correct 251 ms 22136 KB Output is correct
23 Correct 246 ms 22140 KB Output is correct
24 Correct 259 ms 22224 KB Output is correct
25 Correct 112 ms 12280 KB Output is correct
26 Correct 110 ms 12152 KB Output is correct
27 Correct 246 ms 22140 KB Output is correct
28 Correct 252 ms 22136 KB Output is correct
29 Correct 109 ms 12244 KB Output is correct

Subtask #4
0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 256 KB Output is correct
3 Incorrect 1 ms 256 KB Too many ways to get from 1 to 4, 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 1 ms 256 KB Output is correct
2 Incorrect 1 ms 256 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 1 ms 256 KB Output is correct
2 Incorrect 1 ms 256 KB Answer gives possible 0 while actual possible 1
3 Halted 0 ms 0 KB -