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Submission #242684

# Submission time Handle Problem Language Result Execution time Memory
242684 2020-06-29T01:28:29 Z luciocf Swap (BOI16_swap) C++14
48 / 100
 1000 ms 262148 KB 
#include <bits/stdc++.h>

using namespace std;

const int maxn = 2e5+10;
const int maxl = 35;

int a[maxn];

int pai[maxn];
int l[maxn], r[maxn];

vector<int> dp[maxn][maxl];

map<int, int> anc[maxn];

void get_anc(int u)
{
	int ind = 0, v = u;

	while (v)
	{
		anc[u][a[v]] = ++ind;

		if (l[pai[v]] != v && l[pai[v]]) anc[u][a[l[pai[v]]]] = ++ind;

		v = pai[v];
	}
}

bool menor(vector<int> a, vector<int> b)
{
	if (!b.size()) return true;

	for (int i = 0; i < a.size(); i++)
	{
		if (a[i] < b[i]) return true;
		if (a[i] > b[i]) return false;
	}

	return true;
}

vector<int> get(int u, int v, int f1, int x1, int f2, int x2)
{
	vector<int> aux;
	aux.push_back(v);

	int ptr = 0;
	int ind1 = anc[f1][x1], ind2 = anc[f2][x2];

	for (int p = 0; ptr + (1<<p)-1 < dp[f2][ind2].size(); p++)
	{
		for (int i = ptr; i < ptr + (1<<p); i++)
			aux.push_back(dp[f1][ind1][i]);

		for (int i = ptr; i < ptr + (1<<p); i++)
			aux.push_back(dp[f2][ind2][i]);

		ptr += (1<<p);
	}

	for (int i = ptr; i < dp[f1][ind1].size(); i++)
		aux.push_back(dp[f1][ind1][i]);

	for (int i = ptr; i < dp[f2][ind2].size(); i++)
		aux.push_back(dp[f2][ind2][i]);

	return aux;
}

void solve(int u, int v)
{
	if (!u || dp[u][anc[u][v]].size()) return;

	vector<int> ans;

	int f1 = l[u], f2 = r[u];
	int x1 = a[f1], x2 = a[f2];

	solve(f1, x1); solve(f2, x2);

	vector<int> aux = get(u, v, f1, x1, f2, x2);
	if (menor(aux, ans)) ans = aux;

	if (l[u] && r[u])
	{
		x1 = v, x2 = a[l[u]];

		solve(f1, x1); solve(f2, x2);

		aux = get(u, a[r[u]], f1, x1, f2, x2);
		if (menor(aux, ans)) ans = aux;
	}

	if (l[u])
	{
		x1 = v, x2 = a[r[u]];

		solve(f1, x1); solve(f2, x2);

		aux = get(u, a[l[u]], f1, x1, f2, x2);
		if (menor(aux, ans)) ans = aux;
	}

	if (r[u])
	{
		x1 = a[l[u]], x2 = v;

		solve(f1, x1); solve(f2, x2);

		aux = get(u, a[r[u]], f1, x1, f2, x2);
		if (menor(aux, ans)) ans = aux;
	}

	dp[u][anc[u][v]] = ans;
}

int main(void)
{
	int n;
	scanf("%d", &n);

	for (int i = 1; i <= n; i++)
		scanf("%d", &a[i]);

	for (int i = 1; i <= n; i++)
	{
		if (2*i <= n) l[i] = 2*i;

		if (2*i+1 <= n) r[i] = 2*i+1;

		pai[i] = i/2;
	}

	for (int i = 1; i <= n; i++)
		get_anc(i);

	solve(1, a[1]);

	for (auto x: dp[1][anc[1][a[1]]])
		printf("%d ", x);

	printf("\n");
}

Compilation message

swap.cpp: In function 'bool menor(std::vector<int>, std::vector<int>)':
swap.cpp:35:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < a.size(); i++)
                  ~~^~~~~~~~~~
swap.cpp: In function 'std::vector<int> get(int, int, int, int, int, int)':
swap.cpp:52:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int p = 0; ptr + (1<<p)-1 < dp[f2][ind2].size(); p++)
                  ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
swap.cpp:63:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = ptr; i < dp[f1][ind1].size(); i++)
                    ~~^~~~~~~~~~~~~~~~~~~~~
swap.cpp:66:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = ptr; i < dp[f2][ind2].size(); i++)
                    ~~^~~~~~~~~~~~~~~~~~~~~
swap.cpp: In function 'int main()':
swap.cpp:122:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
swap.cpp:125:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a[i]);
   ~~~~~^~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 110 ms 174200 KB Output is correct
2 Correct 111 ms 174072 KB Output is correct
3 Correct 113 ms 174200 KB Output is correct
4 Correct 111 ms 174200 KB Output is correct
5 Correct 109 ms 174140 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 110 ms 174200 KB Output is correct
2 Correct 111 ms 174072 KB Output is correct
3 Correct 113 ms 174200 KB Output is correct
4 Correct 111 ms 174200 KB Output is correct
5 Correct 109 ms 174140 KB Output is correct
6 Correct 111 ms 174072 KB Output is correct
7 Correct 122 ms 174072 KB Output is correct
8 Correct 122 ms 174072 KB Output is correct
9 Correct 112 ms 174200 KB Output is correct
10 Correct 118 ms 174200 KB Output is correct

Subtask #3
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 110 ms 174200 KB Output is correct
2 Correct 111 ms 174072 KB Output is correct
3 Correct 113 ms 174200 KB Output is correct
4 Correct 111 ms 174200 KB Output is correct
5 Correct 109 ms 174140 KB Output is correct
6 Correct 111 ms 174072 KB Output is correct
7 Correct 122 ms 174072 KB Output is correct
8 Correct 122 ms 174072 KB Output is correct
9 Correct 112 ms 174200 KB Output is correct
10 Correct 118 ms 174200 KB Output is correct
11 Correct 125 ms 175388 KB Output is correct
12 Correct 122 ms 175352 KB Output is correct
13 Correct 126 ms 175352 KB Output is correct
14 Correct 129 ms 175352 KB Output is correct
15 Correct 132 ms 175352 KB Output is correct

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 110 ms 174200 KB Output is correct
2 Correct 111 ms 174072 KB Output is correct
3 Correct 113 ms 174200 KB Output is correct
4 Correct 111 ms 174200 KB Output is correct
5 Correct 109 ms 174140 KB Output is correct
6 Correct 111 ms 174072 KB Output is correct
7 Correct 122 ms 174072 KB Output is correct
8 Correct 122 ms 174072 KB Output is correct
9 Correct 112 ms 174200 KB Output is correct
10 Correct 118 ms 174200 KB Output is correct
11 Correct 125 ms 175388 KB Output is correct
12 Correct 122 ms 175352 KB Output is correct
13 Correct 126 ms 175352 KB Output is correct
14 Correct 129 ms 175352 KB Output is correct
15 Correct 132 ms 175352 KB Output is correct
16 Execution timed out 1084 ms 262148 KB Time limit exceeded
17 Halted 0 ms 0 KB -

Subtask #5
0 / 32.0

# Verdict Execution time Memory Grader output
1 Correct 110 ms 174200 KB Output is correct
2 Correct 111 ms 174072 KB Output is correct
3 Correct 113 ms 174200 KB Output is correct
4 Correct 111 ms 174200 KB Output is correct
5 Correct 109 ms 174140 KB Output is correct
6 Correct 111 ms 174072 KB Output is correct
7 Correct 122 ms 174072 KB Output is correct
8 Correct 122 ms 174072 KB Output is correct
9 Correct 112 ms 174200 KB Output is correct
10 Correct 118 ms 174200 KB Output is correct
11 Correct 125 ms 175388 KB Output is correct
12 Correct 122 ms 175352 KB Output is correct
13 Correct 126 ms 175352 KB Output is correct
14 Correct 129 ms 175352 KB Output is correct
15 Correct 132 ms 175352 KB Output is correct
16 Execution timed out 1084 ms 262148 KB Time limit exceeded
17 Halted 0 ms 0 KB -