| Task: | Sorting |
| Sender: | YouKnowWho |
| Submission time: | 2021-01-30 16:59:36 +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;
int32_t main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
int t; cin >> t;
while (t--) {
int n; cin >> n;
vector<int> a(n), b(n);
for (int i = 0; i < n; i++) {
cin >> a[i];
b[i] = i + 1;
}
int ok = 0;
if (n <= 3) {
ok = a == b;
}
else if (n == 4) {
if (a == b || (a == vector<int>({3, 4, 1, 2}))) {
ok = 1;
}
}
else {
int inv = 0;
for (int i = 0; i < n; i++) {
for (int j = i + 1; j < n; j++) {
inv += a[i] > a[j];
}
}
ok = inv % 2 == 0;
}
if (ok) {
cout << "YES\n";
}
else {
cout << "NO\n";
}
}
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 |