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Submission #438394

# Submission time Handle Problem Language Result Execution time Memory
438394 2021-06-27T22:19:14 Z ruadhan Sorting (IOI15_sorting) C++11
54 / 100
 236 ms 16256 KB 
#include "sorting.h"
#include <bits/stdc++.h>

using namespace std;

const int MX = 1e5 + 5;
int n, m;
vector<int> s, x, y;
vector<int> a, revA, en, revEn;

bool valid(int t)
{
	a = s;
	for (int i = 0; i < t; i++)
		swap(a[x[i]], a[y[i]]);
	for (int i = 0; i < n; i++)
		revA[a[i]] = i;
	int cnt = 0;
	for (int i = 0; i < n; i++)
		if (a[i] != i)
		{
			int j = revA[i];
			swap(revA[a[i]], revA[a[j]]);
			swap(a[i], a[j]);
			cnt++;
		}
	return cnt <= t;
}

int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[])
{
	n = N, m = M;
	s.resize(N), x.resize(N), y.resize(N), a.resize(N), revA.resize(N), en.resize(N), revEn.resize(N);

	for (int i = 0; i < N; i++)
	{
		s.at(i) = S[i];
		x.at(i) = X[i];
		y.at(i) = Y[i];
	}
	int R = 0;
	int l = 0, r = M;
	while (l != r)
	{
		int mid = (l + r) / 2;
		if (!valid(mid))
			l = mid + 1;
		else
			r = mid;
	}
	R = l;

	a = s;
	for (int i = 0; i < n; i++)
		revA[a[i]] = i;
	en = a;
	for (int i = 0; i < R; i++)
		swap(en[x[i]], en[y[i]]);
	for (int i = 0; i < n; i++)
		revEn[en[i]] = i;

	queue<pair<int, int>> changes;
	vector<int> tmp = en;

	for (int i = 0; i < n; i++)
		if (tmp[i] != i)
		{
			int j = revEn[i];
			swap(revEn[tmp[i]], revEn[tmp[j]]);
			swap(tmp[i], tmp[j]);
			changes.push({i, j});
		}
	for (int i = 0; i < R; i++)
	{
		swap(revA[a[x[i]]], revA[a[y[i]]]);
		swap(a[x[i]], a[y[i]]);
		if (!changes.empty())
		{
			auto change = changes.front();
			changes.pop();
			P[i] = revA[en[change.first]];
			Q[i] = revA[en[change.second]];
			swap(en[change.first], en[change.second]);
			swap(revA[a[P[i]]], revA[a[Q[i]]]);
			swap(a[P[i]], a[Q[i]]);
		}
		else
			P[i] = Q[i] = 1;
	}

	return R;
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 224 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 224 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Runtime error 1 ms 460 KB Execution killed with signal 11
11 Halted 0 ms 0 KB -

Subtask #3
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Runtime error 1 ms 332 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 224 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Runtime error 1 ms 460 KB Execution killed with signal 11
11 Halted 0 ms 0 KB -

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 332 KB Output is correct
2 Correct 2 ms 460 KB Output is correct
3 Correct 2 ms 340 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 2 ms 332 KB Output is correct
8 Correct 2 ms 332 KB Output is correct
9 Correct 2 ms 460 KB Output is correct
10 Correct 2 ms 332 KB Output is correct
11 Correct 2 ms 460 KB Output is correct
12 Correct 2 ms 332 KB Output is correct
13 Correct 2 ms 460 KB Output is correct
14 Correct 1 ms 332 KB Output is correct

Subtask #6
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 332 KB Output is correct
2 Correct 2 ms 460 KB Output is correct
3 Correct 2 ms 340 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 2 ms 332 KB Output is correct
8 Correct 2 ms 332 KB Output is correct
9 Correct 2 ms 460 KB Output is correct
10 Correct 2 ms 332 KB Output is correct
11 Correct 2 ms 460 KB Output is correct
12 Correct 2 ms 332 KB Output is correct
13 Correct 2 ms 460 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 177 ms 13856 KB Output is correct
16 Correct 184 ms 14148 KB Output is correct
17 Correct 197 ms 14852 KB Output is correct
18 Correct 76 ms 11076 KB Output is correct
19 Correct 154 ms 13492 KB Output is correct
20 Correct 166 ms 14132 KB Output is correct
21 Correct 175 ms 14208 KB Output is correct
22 Correct 165 ms 15004 KB Output is correct
23 Correct 207 ms 15336 KB Output is correct
24 Correct 236 ms 15144 KB Output is correct
25 Correct 210 ms 15016 KB Output is correct
26 Correct 161 ms 14188 KB Output is correct
27 Correct 140 ms 13508 KB Output is correct
28 Correct 229 ms 16256 KB Output is correct
29 Correct 191 ms 15656 KB Output is correct
30 Correct 121 ms 12656 KB Output is correct
31 Correct 192 ms 15936 KB Output is correct
32 Correct 210 ms 14920 KB Output is correct
33 Correct 226 ms 15200 KB Output is correct
34 Correct 206 ms 15156 KB Output is correct
35 Correct 156 ms 13540 KB Output is correct
36 Correct 73 ms 11944 KB Output is correct
37 Correct 217 ms 15572 KB Output is correct
38 Correct 214 ms 14956 KB Output is correct
39 Correct 218 ms 15144 KB Output is correct