| Task: | Sorting |
| Sender: | mofk |
| Submission time: | 2021-01-30 17:05:31 +0200 |
| Language: | C++ (C++17) |
| Status: | READY |
| Result: | 100 |
| group | verdict | score |
|---|---|---|
| #1 | ACCEPTED | 36 |
| #2 | ACCEPTED | 64 |
| 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 ... |
| correct output |
|---|
| YES YES NO NO NO ... |
| user output |
|---|
| YES YES NO NO NO ... Truncated |
Test 2
Group: 2
Verdict: ACCEPTED
| input |
|---|
| 1000 59 35 29 32 50 11 15 9 21 19 45 2... |
| correct output |
|---|
| YES NO YES NO YES ... |
| user output |
|---|
| YES NO YES NO YES ... Truncated |
Test 3
Group: 1, 2
Verdict: ACCEPTED
| input |
|---|
| 720 6 1 6 4 5 2 3 6 6 3 2 1 5 4 ... |
| correct output |
|---|
| YES NO NO NO YES ... |
| user output |
|---|
| YES NO NO NO YES ... Truncated |
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 ... |
| correct output |
|---|
| NO NO YES NO YES ... |
| user output |
|---|
| NO NO YES NO YES ... Truncated |