— Dark mode

Datatähti 2021 loppu

Järjestäminen

  • Start: 2021-01-23 16:00:00
  • End: 2021-01-23 20:00:00
  • Contest has ended
CSES - Datatähti 2021 loppu - Results
Submission details
Task:Järjestäminen
Sender:intoo
Submission time:2021-01-23 18:06:30 +0200
Language:C++ (C++17)
Status:READY
Result:0
Feedback
groupverdictscore
#10
#20
Test results
testverdicttimegroup
#10.01 s1, 2details
#20.01 s2details
#30.01 s1, 2details
#40.01 s1, 2details

Code

#include <iostream>
#include <vector>
 
using namespace std;
 
void swappair(vector<int>& v, vector<int>& d, int i, int j) {
	swap(v[i+1], v[j+1]);
	swap(d[v[i+1]], d[v[j+1]]);
	swap(v[i], v[j]);
	swap(d[v[i]], d[v[j]]);
}
 
int main() {
	int t;
	cin >> t;
	while (t --> 0) {
		int n;
		cin >> n;
		vector<int> v(n), d(n);
		for (int i = 0; i < n; ++i) {
			cin >> v[i];
			--v[i];
			d[v[i]] = i;
		}
		bool b = 0;
		for (int i = 0; i < n; ++i) {
			if (d[i] == i) continue;
			if (n-d[i]-2 < 2 && d[i]-i < 2) {
				cout << "NO\n";
				b = 1;
				break;
			} else if (d[i]-i > 1) {
				swappair(v, d, i, d[i]);
			} else {
				swappair(v, d, d[i], d[i]+2);
				swappair(v, d, i, d[i]);
			}
		}
		if (b) continue;
		cout << "YES\n";
	}
}

Test details

Test 1

Group: 1, 2

Verdict:

input
153
1
1
2
1 2
...
view save

correct output
YES
YES
NO
NO
NO
...
view save

user output
YES
YES
NO
NO
NO
...
Truncated

Test 2

Group: 2

Verdict:

input
1000
59
35 29 32 50 11 15 9 21 19 45 2...
view save

correct output
YES
NO
YES
NO
YES
...
view save

user output
NO
YES
NO
YES
NO
...
view save

Error:
munmap_chunk(): invalid pointer

Test 3

Group: 1, 2

Verdict:

input
720
6
1 6 4 5 2 3
6
6 3 2 1 5 4
...
view save

correct output
YES
NO
NO
NO
YES
...
view save

user output
(empty)

Test 4

Group: 1, 2

Verdict:

input
1000
8
7 4 2 8 6 3 5 1
8
3 8 2 7 5 4 6 1
...
view save

correct output
NO
NO
YES
NO
YES
...
view save

user output
NO
YES
NO
NO
YES
...
Truncated

Tasks

A Suuremmat-B Kolmijako-C Järjestäminen-D Etäisyydet-E Koodarit-F Murtoviiva-

Submissions (intoo)

2021-01-23 19:02:18 02021-01-23 18:36:25 02021-01-23 18:06:30 0