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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:jubidubi
Submission time:2021-01-23 17:32:09 +0200
Language:C++ (C++11)
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 <bits/stdc++.h>
using namespace std;
using ll = long long;
 
const int N = 1 << 7;
int p[2*N];
 
int sum(int a, int b) {
	a += N;
	b += N;
	int s = 0;
	while (a <= b) {
		if (a % 2 == 1) s += p[a++];
		if (b % 2 == 0) s += p[b--];
		a /= 2;
		b /= 2;
	}
	return s;
}
 
void add(int k) {
	k += N;
	++p[k];
	for (k /= 2; k >= 1; k /= 2) {
		p[k] = p[2 * k] + p[2 * k + 1];
	}
}
 
int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
 
	int t;
	cin >> t;
 
	while (t--) {
		int n;
		cin >> n;
 
		for (int i = 0; i < 2*N; ++i) p[i] = 0;
 
		int s = 0;
		for (int i = 0; i < n; ++i) {
			int x;
			cin >> x;
 
			s += sum(x + 1, N - 1);
			add(x);
		}
		if (s % 2 != 0 || s == 2) cout << "NO\n";
		else 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...
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correct output
YES
NO
YES
NO
YES
...
view save

user output
YES
NO
YES
NO
YES
...
Truncated

Test 3

Group: 1, 2

Verdict:

input
720
6
1 6 4 5 2 3
6
6 3 2 1 5 4
...
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correct output
YES
NO
NO
NO
YES
...
view save

user output
YES
NO
NO
NO
YES
...
Truncated

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

user output
NO
NO
YES
NO
YES
...
Truncated

Tasks

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

Submissions (jubidubi)

2021-01-23 18:02:39 02021-01-23 17:32:09 0