| Task: | Sorting |
| Sender: | koosaga |
| Submission time: | 2021-01-30 11:24:36 +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 | 0.02 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;
const int MAXN = 105;
using lint = long long;
void solve(){
int n; cin >> n;
vector<int> a(n);
for(auto &i : a) cin >> i;
int ret = 0;
for(int i=0; i<n; i++){
for(int j=i+1; j<n; j++){
if(a[j] < a[i]) ret++;
}
}
if(n <= 3){
puts(ret ? "NO" : "YES");
}
else if(n > 4){
puts(ret % 2 ? "NO" : "YES");
}
else{
if(is_sorted(a.begin(), a.end())) puts("YES");
else{
swap(a[0], a[2]);
swap(a[1], a[3]);
puts(is_sorted(a.begin(), a.end()) ? "YES" : "NO");
}
}
}
int main(){
int t; cin >> t;
while(t--) solve();
}
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 |