CSES - Datatähti Open 2021

CSES - Datatähti Open 2021 - Results

Submission details
Task:	Sorting
Sender:	mofk
Submission time:	2021-01-30 17:05:31 +0200
Language:	C++17
Status:	READY
Result:	100

Feedback
group	verdict	score
#1	ACCEPTED	36
#2	ACCEPTED	64

Test results
test	verdict	time	group
#1	ACCEPTED	0.01 s	1, 2	details
#2	ACCEPTED	0.01 s	2	details
#3	ACCEPTED	0.01 s	1, 2	details
#4	ACCEPTED	0.01 s	1, 2	details

Code

#include <bits/stdc++.h>

using namespace std;

int main(void) {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int ntest;
    cin >> ntest;
    while (ntest--) {
        int n;
        cin >> n;
        vector<int> a(n + 1);
        int ans = 0;
        for (int i = 1; i <= n; ++i) {
            cin >> a[i];
            for (int j = 1; j < i; ++j) if (a[j] > a[i]) ++ans;
        }
        string yes;
        if (n < 4) yes = (ans ? "NO" : "YES");
        else if (n > 4) yes = (ans % 2 ? "NO" : "YES");
        else {
            yes = "NO";
            if (ans == 0) yes = "YES";
            if (a[1] == 3 && a[2] == 4 && a[3] == 1 && a[4] == 2) yes = "YES";
        }
        cout << yes << endl;
    }
    return 0;
}

Test details

Test 1

Group: 1, 2

Verdict: ACCEPTED

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 ...` view save

Test 2

Group: 2

Verdict: ACCEPTED

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
`YES NO YES NO YES ...` view save

Test 3

Group: 1, 2

Verdict: ACCEPTED

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
`YES NO NO NO YES ...` view save

Test 4

Group: 1, 2

Verdict: ACCEPTED

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 NO YES NO YES ...` view save

Datatähti Open 2021

Sorting

Code

Test details

Test 1

Test 2

Test 3

Test 4

Tasks

Submissions (mofk)