oj.uz

Submission #461304

# Submission time Handle Problem Language Result Execution time Memory
461304 2021-08-09T17:19:52 Z armand Connecting Supertrees (IOI20_supertrees) C++14
11 / 100
 423 ms 25996 KB 
#include "supertrees.h"
#include <vector>

int pp[1001][1001];
int n;
std::vector<std::vector<int>> answer;

bool all1()
{
	int i, j;
	for (i = 0; i < n; i++)
		for (j = 0; j < n; j++)
			if (pp[i][j] != 1)
				return false;
	return true;
}

bool all01()
{
	int i, j;
	for (i = 0; i < n; i++)
		for (j = 0; j < n; j++)
			if (pp[i][j] > 1)
				return false;
	return true;
}

void solve1()
{
	int i;
	for (i = 0; i < n - 1; i++) {
		answer[i][i + 1] = 1;
		answer[i + 1][i] = 1;
	}
}

int color[1001];
int nodes[1001];
int nn;
bool flag2;
void dfs(int u, int prnt)
{
	int j;
	if (prnt == -1) {
		std::vector<int> v;
		for (j = 0; j < n; j++)
			if (pp[u][j])
				v.push_back(j);
		for (j = 0; j < v.size() - 1; j++)
			if (!pp[v[j]][v[j + 1]])
				flag2 = false;
		if (v.size() > 1 && !pp[v[0]][v.size() - 1])
			flag2 = false;
	}
	for(j=0; j<n; j++)
		if (pp[u][j] && !color[j]) {
			nodes[nn++] = j;
			color[j] = 1;
			if (prnt != -1 && !pp[j][prnt])
				flag2 = false;
			dfs(j, u);
		}
}

void solve2()
{
	int i, j;
	for (i = 0; i < n; i++) {
		if (!color[i]) {
			nn = 0;
			color[i] = 1;
			dfs(i, -1);
			for (j = 1; j < nn; j++) {
				answer[nodes[j]][nodes[j - 1]] = 1;
				answer[nodes[j - 1]][nodes[j]] = 1;
			}
		}
	}
}

int construct(std::vector<std::vector<int>> p)
{
	n = p.size();
	int i, j, k;
	for (i = 0; i < n; i++)
		for (j = i + 1; j < n; j++)
			if (p[i][j])
				for (k = j + 1; k < n; k++)
					if (p[j][k] && !p[i][k])
						return 0;
	for (i = 0; i < n; i++)
		for (j = 0; j < n; j++)
			pp[i][j] = p[i][j];
	for (int i = 0; i < n; i++) {
		std::vector<int> row;
		row.resize(n);
		answer.push_back(row);
	}
	if (all1())
		solve1();
	else if (all01()) {
		flag2 = true;
		solve2();
		if (flag2) {
			build(answer);
			return 1;
		}
		else
			return 0;
	}
	build(answer);
	return 1;
}

Compilation message

supertrees.cpp: In function 'void dfs(int, int)':
supertrees.cpp:49:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |   for (j = 0; j < v.size() - 1; j++)
      |               ~~^~~~~~~~~~~~~~

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 12 ms 1948 KB Output is correct
7 Correct 423 ms 25980 KB Output is correct

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 12 ms 1948 KB Output is correct
7 Correct 423 ms 25980 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 0 ms 332 KB Output is correct
12 Correct 10 ms 1868 KB Output is correct
13 Correct 244 ms 25996 KB Output is correct
14 Correct 0 ms 204 KB Output is correct
15 Correct 0 ms 204 KB Output is correct
16 Correct 5 ms 588 KB Output is correct
17 Correct 108 ms 8056 KB Output is correct
18 Correct 0 ms 204 KB Output is correct
19 Correct 0 ms 204 KB Output is correct
20 Incorrect 38 ms 5120 KB Answer gives possible 0 while actual possible 1
21 Halted 0 ms 0 KB -

Subtask #3
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Incorrect 0 ms 204 KB Answer gives possible 1 while actual possible 0
5 Halted 0 ms 0 KB -

Subtask #4
0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Incorrect 0 ms 204 KB Too few ways to get from 0 to 1, should be 2 found 0
3 Halted 0 ms 0 KB -

Subtask #5
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 12 ms 1948 KB Output is correct
7 Correct 423 ms 25980 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 0 ms 332 KB Output is correct
12 Correct 10 ms 1868 KB Output is correct
13 Correct 244 ms 25996 KB Output is correct
14 Correct 0 ms 204 KB Output is correct
15 Correct 0 ms 204 KB Output is correct
16 Correct 5 ms 588 KB Output is correct
17 Correct 108 ms 8056 KB Output is correct
18 Correct 0 ms 204 KB Output is correct
19 Correct 0 ms 204 KB Output is correct
20 Incorrect 38 ms 5120 KB Answer gives possible 0 while actual possible 1
21 Halted 0 ms 0 KB -

Subtask #6
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 12 ms 1948 KB Output is correct
7 Correct 423 ms 25980 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 0 ms 332 KB Output is correct
12 Correct 10 ms 1868 KB Output is correct
13 Correct 244 ms 25996 KB Output is correct
14 Correct 0 ms 204 KB Output is correct
15 Correct 0 ms 204 KB Output is correct
16 Correct 5 ms 588 KB Output is correct
17 Correct 108 ms 8056 KB Output is correct
18 Correct 0 ms 204 KB Output is correct
19 Correct 0 ms 204 KB Output is correct
20 Incorrect 38 ms 5120 KB Answer gives possible 0 while actual possible 1
21 Halted 0 ms 0 KB -