CSES - Datatähti Open 2021 - Results
Submission details
Task:Sorting
Sender:ritul_kr_singh
Submission time:2021-01-30 18:22:31 +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;
//#define int long long
int a[100], pos[100], n, ok;
void exchange(int i, int j){
if(i<0 || j<0 || i+1>=n || j+1>=n){
ok = 0;
return;
}
swap(a[i], a[j]);
swap(pos[a[i]], pos[a[j]]);
++i; ++j;
swap(a[i], a[j]);
swap(pos[a[i]], pos[a[j]]);
}
signed main(){
ios_base::sync_with_stdio(false); cin.tie(nullptr);
int t; cin >> t;
while(t--){
cin >> n;
ok=1;
for(int i=0; i<n; ++i) cin >> a[i];
for(int i=0; i<n; ++i) --a[i];
for(int i=0; i<n; ++i){
pos[a[i]] = i;
}
for(int i=0; i<n && ok; ++i){
int ind = pos[i];
if(ind==i) continue;
if(ind==n-1){
if(n-4<i) ok = 0;
else{
exchange(n-4, n-2);
}
}else if(ind==i+1){
if(i+4>=n) ok = 0;
else{
exchange(i+1, i+3);
}
}else{
exchange(i, ind);
}
}
if(ok) cout << "YES\n";
else cout << "NO\n";
}
}

Test details

Test 1

Group: 1, 2

Verdict:

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:

input
1000
59
35 29 32 50 11 15 9 21 19 45 2...

correct output
YES
NO
YES
NO
YES
...

user output
NO
NO
NO
NO
NO
...
Truncated

Test 3

Group: 1, 2

Verdict:

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
NO
NO
NO
YES
NO
...
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
...

correct output
NO
NO
YES
NO
YES
...

user output
NO
NO
NO
NO
NO
...
Truncated