oj.uz

Submission #300844

# Submission time Handle Problem Language Result Execution time Memory
300844 2020-09-17T14:15:58 Z luciocf Connecting Supertrees (IOI20_supertrees) C++14
96 / 100
 346 ms 23164 KB 
#include <bits/stdc++.h>
#include "supertrees.h"
#include <vector>

using namespace std;

const int maxn = 1e3+10;

struct DSU
{
	int pai[maxn], peso[maxn];

	void init(int n)
	{
		for (int i = 0; i < n; i++)
			pai[i] = i, peso[i] = 1;
	}

	int Find(int x)
	{
		if (pai[x] == x) return x;
		return pai[x] = Find(pai[x]);
	}

	void Join(int x, int y)
	{
		x = Find(x), y = Find(y);
		if (x == y) return;

		if (peso[x] < peso[y]) swap(x, y);

		pai[y] = x, peso[x] += peso[y];
	}
} dsu;

int pai[maxn];

bool liga[maxn][maxn];
bool in[maxn];

void edge(int u, int v)
{
	liga[u][v] = liga[v][u] = 1;
}

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

	dsu.init(n);

	for (int i = 0; i < n; i++)
		for (int j = 0; j < n; j++)
			if (p[i][j] != 0)
				dsu.Join(i, j);

	for (int i = 0; i < n; i++)
		for (int j = 0; j < n; j++)
			if (dsu.Find(i) == dsu.Find(j) && p[i][j] == 0)
				return 0;

	for (int f = 0; f < n; f++)
	{
		vector<int> comp;

		for (int j = 0; j < n; j++)
			if (dsu.Find(j) == f)
				comp.push_back(j);

		if (comp.size() == 0) continue;

		int u = -1, v = -1;

		for (auto i: comp)
			for (auto j: comp)
				if (p[i][j] == 2)
					u = i, v = j;

		if (u == -1)
		{
			for (auto i = 0; i < comp.size(); i++)
			{
				if (i < (int)comp.size()-1) edge(comp[i], comp[i+1]);
				if (i > 0) edge(comp[i], comp[i-1]);
			}

			continue;
		}

		vector<int> ciclo;
		ciclo.push_back(u); ciclo.push_back(v);
		in[u] = 1, in[v] = 1;

		for (auto i: comp)
		{
			bool ok = 1;

			for (auto c: ciclo)
				if (p[i][c] != 2)
					ok = 0;

			if (ok)
			{
				ciclo.push_back(i);
				in[i] = 1;
			}
		}

		if (ciclo.size() == 2) return 0;

		edge(ciclo[0], ciclo.back());
		for (int i = 1; i < ciclo.size(); i++)
			edge(ciclo[i], ciclo[i-1]);

		for (auto i: comp)
		{
			if (in[i]) continue;

			int ind, qtd = 0;

			for (auto c: ciclo)
				if (p[i][c] == 1)
					++qtd, ind = c;

			if (qtd > 1) return 0;

			pai[i] = ind;
			edge(ind, i);
		}

		for (auto i: comp)
		{
			for (auto j: comp)
			{
				if (!in[i] && !in[j])
				{
					if (pai[i] == pai[j] && p[i][j] == 2) return 0;

					if (pai[i] != pai[j] && p[i][j] == 1) return 0;
				}
			}
		}
	}

	for (int i = 0; i < n; i++)
	{
		vector<int> a;
		a.resize(n);

		for (int j = 0; j < n; j++)
			if (liga[i][j])
				a[j] = 1;

		ans.push_back(a);
	}

	build(ans);
	return 1;
}

Compilation message

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:82:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   82 |    for (auto i = 0; i < comp.size(); i++)
      |                     ~~^~~~~~~~~~~~~
supertrees.cpp:113:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  113 |   for (int i = 1; i < ciclo.size(); i++)
      |                   ~~^~~~~~~~~~~~~~
supertrees.cpp:43:13: warning: 'ind' may be used uninitialized in this function [-Wmaybe-uninitialized]
   43 |  liga[u][v] = liga[v][u] = 1;
      |  ~~~~~~~~~~~^~~~~~~~~~~~~~~~
supertrees.cpp:120:8: note: 'ind' was declared here
  120 |    int ind, qtd = 0;
      |        ^~~

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 12 ms 1408 KB Output is correct
7 Correct 271 ms 23128 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 12 ms 1408 KB Output is correct
7 Correct 271 ms 23128 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 0 ms 384 KB Output is correct
10 Correct 0 ms 256 KB Output is correct
11 Correct 0 ms 384 KB Output is correct
12 Correct 12 ms 1152 KB Output is correct
13 Correct 257 ms 22108 KB Output is correct
14 Correct 1 ms 256 KB Output is correct
15 Correct 0 ms 256 KB Output is correct
16 Correct 5 ms 640 KB Output is correct
17 Correct 120 ms 8156 KB Output is correct
18 Correct 0 ms 256 KB Output is correct
19 Correct 1 ms 256 KB Output is correct
20 Correct 67 ms 6264 KB Output is correct
21 Correct 267 ms 23032 KB Output is correct
22 Correct 261 ms 23160 KB Output is correct
23 Correct 274 ms 23032 KB Output is correct
24 Correct 257 ms 22268 KB Output is correct
25 Correct 110 ms 8184 KB Output is correct
26 Correct 114 ms 8184 KB Output is correct
27 Correct 287 ms 23160 KB Output is correct
28 Correct 259 ms 22360 KB Output is correct

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 384 KB Output is correct
3 Correct 0 ms 256 KB Output is correct
4 Correct 0 ms 256 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 0 ms 384 KB Output is correct
8 Correct 11 ms 1280 KB Output is correct
9 Correct 257 ms 22136 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 0 ms 384 KB Output is correct
12 Correct 11 ms 1408 KB Output is correct
13 Correct 274 ms 23032 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 640 KB Output is correct
17 Correct 118 ms 8184 KB Output is correct
18 Correct 1 ms 256 KB Output is correct
19 Correct 1 ms 384 KB Output is correct
20 Correct 0 ms 384 KB Output is correct
21 Correct 67 ms 6352 KB Output is correct
22 Correct 266 ms 23032 KB Output is correct
23 Correct 266 ms 23164 KB Output is correct
24 Correct 277 ms 23160 KB Output is correct
25 Correct 111 ms 8440 KB Output is correct
26 Correct 111 ms 8184 KB Output is correct
27 Correct 260 ms 23032 KB Output is correct
28 Correct 346 ms 23132 KB Output is correct
29 Correct 110 ms 8440 KB Output is correct

Subtask #4
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 288 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 67 ms 6356 KB Output is correct
5 Correct 266 ms 23160 KB Output is correct
6 Correct 270 ms 23032 KB Output is correct
7 Correct 273 ms 23032 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 65 ms 6264 KB Output is correct
10 Correct 270 ms 23032 KB Output is correct
11 Correct 256 ms 23032 KB Output is correct
12 Correct 279 ms 23036 KB Output is correct
13 Correct 0 ms 384 KB Output is correct
14 Correct 0 ms 384 KB Output is correct
15 Correct 0 ms 384 KB Output is correct
16 Correct 69 ms 6264 KB Output is correct
17 Correct 264 ms 23032 KB Output is correct
18 Correct 270 ms 23032 KB Output is correct
19 Correct 274 ms 23160 KB Output is correct
20 Correct 258 ms 22232 KB Output is correct

Subtask #5
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 12 ms 1408 KB Output is correct
7 Correct 271 ms 23128 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 0 ms 384 KB Output is correct
10 Correct 0 ms 256 KB Output is correct
11 Correct 0 ms 384 KB Output is correct
12 Correct 12 ms 1152 KB Output is correct
13 Correct 257 ms 22108 KB Output is correct
14 Correct 1 ms 256 KB Output is correct
15 Correct 0 ms 256 KB Output is correct
16 Correct 5 ms 640 KB Output is correct
17 Correct 120 ms 8156 KB Output is correct
18 Correct 0 ms 256 KB Output is correct
19 Correct 1 ms 256 KB Output is correct
20 Correct 67 ms 6264 KB Output is correct
21 Correct 267 ms 23032 KB Output is correct
22 Correct 261 ms 23160 KB Output is correct
23 Correct 274 ms 23032 KB Output is correct
24 Correct 257 ms 22268 KB Output is correct
25 Correct 110 ms 8184 KB Output is correct
26 Correct 114 ms 8184 KB Output is correct
27 Correct 287 ms 23160 KB Output is correct
28 Correct 259 ms 22360 KB Output is correct
29 Correct 1 ms 256 KB Output is correct
30 Correct 1 ms 384 KB Output is correct
31 Correct 0 ms 256 KB Output is correct
32 Correct 0 ms 256 KB Output is correct
33 Correct 0 ms 384 KB Output is correct
34 Correct 1 ms 384 KB Output is correct
35 Correct 0 ms 384 KB Output is correct
36 Correct 11 ms 1280 KB Output is correct
37 Correct 257 ms 22136 KB Output is correct
38 Correct 1 ms 384 KB Output is correct
39 Correct 0 ms 384 KB Output is correct
40 Correct 11 ms 1408 KB Output is correct
41 Correct 274 ms 23032 KB Output is correct
42 Correct 1 ms 256 KB Output is correct
43 Correct 1 ms 256 KB Output is correct
44 Correct 5 ms 640 KB Output is correct
45 Correct 118 ms 8184 KB Output is correct
46 Correct 1 ms 256 KB Output is correct
47 Correct 1 ms 384 KB Output is correct
48 Correct 0 ms 384 KB Output is correct
49 Correct 67 ms 6352 KB Output is correct
50 Correct 266 ms 23032 KB Output is correct
51 Correct 266 ms 23164 KB Output is correct
52 Correct 277 ms 23160 KB Output is correct
53 Correct 111 ms 8440 KB Output is correct
54 Correct 111 ms 8184 KB Output is correct
55 Correct 260 ms 23032 KB Output is correct
56 Correct 346 ms 23132 KB Output is correct
57 Correct 110 ms 8440 KB Output is correct
58 Correct 1 ms 256 KB Output is correct
59 Correct 1 ms 256 KB Output is correct
60 Correct 5 ms 640 KB Output is correct
61 Correct 122 ms 8184 KB Output is correct
62 Correct 0 ms 384 KB Output is correct
63 Correct 0 ms 384 KB Output is correct
64 Correct 0 ms 384 KB Output is correct
65 Correct 69 ms 6272 KB Output is correct
66 Correct 109 ms 8184 KB Output is correct
67 Correct 110 ms 8184 KB Output is correct
68 Correct 109 ms 8184 KB Output is correct
69 Correct 135 ms 8312 KB Output is correct

Subtask #6
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 12 ms 1408 KB Output is correct
7 Correct 271 ms 23128 KB Output is correct
8 Correct 0 ms 384 KB Output is correct
9 Correct 0 ms 384 KB Output is correct
10 Correct 0 ms 256 KB Output is correct
11 Correct 0 ms 384 KB Output is correct
12 Correct 12 ms 1152 KB Output is correct
13 Correct 257 ms 22108 KB Output is correct
14 Correct 1 ms 256 KB Output is correct
15 Correct 0 ms 256 KB Output is correct
16 Correct 5 ms 640 KB Output is correct
17 Correct 120 ms 8156 KB Output is correct
18 Correct 0 ms 256 KB Output is correct
19 Correct 1 ms 256 KB Output is correct
20 Correct 67 ms 6264 KB Output is correct
21 Correct 267 ms 23032 KB Output is correct
22 Correct 261 ms 23160 KB Output is correct
23 Correct 274 ms 23032 KB Output is correct
24 Correct 257 ms 22268 KB Output is correct
25 Correct 110 ms 8184 KB Output is correct
26 Correct 114 ms 8184 KB Output is correct
27 Correct 287 ms 23160 KB Output is correct
28 Correct 259 ms 22360 KB Output is correct
29 Correct 1 ms 256 KB Output is correct
30 Correct 1 ms 384 KB Output is correct
31 Correct 0 ms 256 KB Output is correct
32 Correct 0 ms 256 KB Output is correct
33 Correct 0 ms 384 KB Output is correct
34 Correct 1 ms 384 KB Output is correct
35 Correct 0 ms 384 KB Output is correct
36 Correct 11 ms 1280 KB Output is correct
37 Correct 257 ms 22136 KB Output is correct
38 Correct 1 ms 384 KB Output is correct
39 Correct 0 ms 384 KB Output is correct
40 Correct 11 ms 1408 KB Output is correct
41 Correct 274 ms 23032 KB Output is correct
42 Correct 1 ms 256 KB Output is correct
43 Correct 1 ms 256 KB Output is correct
44 Correct 5 ms 640 KB Output is correct
45 Correct 118 ms 8184 KB Output is correct
46 Correct 1 ms 256 KB Output is correct
47 Correct 1 ms 384 KB Output is correct
48 Correct 0 ms 384 KB Output is correct
49 Correct 67 ms 6352 KB Output is correct
50 Correct 266 ms 23032 KB Output is correct
51 Correct 266 ms 23164 KB Output is correct
52 Correct 277 ms 23160 KB Output is correct
53 Correct 111 ms 8440 KB Output is correct
54 Correct 111 ms 8184 KB Output is correct
55 Correct 260 ms 23032 KB Output is correct
56 Correct 346 ms 23132 KB Output is correct
57 Correct 110 ms 8440 KB Output is correct
58 Correct 0 ms 288 KB Output is correct
59 Correct 0 ms 384 KB Output is correct
60 Correct 1 ms 384 KB Output is correct
61 Correct 67 ms 6356 KB Output is correct
62 Correct 266 ms 23160 KB Output is correct
63 Correct 270 ms 23032 KB Output is correct
64 Correct 273 ms 23032 KB Output is correct
65 Correct 0 ms 384 KB Output is correct
66 Correct 65 ms 6264 KB Output is correct
67 Correct 270 ms 23032 KB Output is correct
68 Correct 256 ms 23032 KB Output is correct
69 Correct 279 ms 23036 KB Output is correct
70 Correct 0 ms 384 KB Output is correct
71 Correct 0 ms 384 KB Output is correct
72 Correct 0 ms 384 KB Output is correct
73 Correct 69 ms 6264 KB Output is correct
74 Correct 264 ms 23032 KB Output is correct
75 Correct 270 ms 23032 KB Output is correct
76 Correct 274 ms 23160 KB Output is correct
77 Correct 258 ms 22232 KB Output is correct
78 Correct 1 ms 256 KB Output is correct
79 Correct 1 ms 256 KB Output is correct
80 Correct 5 ms 640 KB Output is correct
81 Correct 122 ms 8184 KB Output is correct
82 Correct 0 ms 384 KB Output is correct
83 Correct 0 ms 384 KB Output is correct
84 Correct 0 ms 384 KB Output is correct
85 Correct 69 ms 6272 KB Output is correct
86 Correct 109 ms 8184 KB Output is correct
87 Correct 110 ms 8184 KB Output is correct
88 Correct 109 ms 8184 KB Output is correct
89 Correct 135 ms 8312 KB Output is correct
90 Correct 1 ms 256 KB Output is correct
91 Correct 0 ms 256 KB Output is correct
92 Correct 5 ms 640 KB Output is correct
93 Correct 119 ms 8184 KB Output is correct
94 Incorrect 0 ms 384 KB Answer gives possible 1 while actual possible 0
95 Halted 0 ms 0 KB -