CSES - Datatähti 2021 loppu - Results
Submission details
Task:Järjestäminen
Sender:Guuber
Submission time:2021-01-23 18:42:27 +0200
Language:C++17
Status:READY
Result:100
Feedback
groupverdictscore
#1ACCEPTED36
#2ACCEPTED64
Test results
testverdicttimegroup
#1ACCEPTED0.01 s1, 2details
#2ACCEPTED0.02 s2details
#3ACCEPTED0.01 s1, 2details
#4ACCEPTED0.01 s1, 2details

Compiler report

input/code.cpp: In function 'int main()':
input/code.cpp:40:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i = 0; i < ve.size(); i++){
                  ~~^~~~~~~~~~~
input/code.cpp:41:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int j = i+1; j < ve.size(); j++){
                     ~~^~~~~~~~~~~

Code

#include<bits/stdc++.h>
using namespace std;

int main(){
	int t;
	cin >> t;
	while(t--){
		int n;
		cin >> n;
		vector<int> ve = {};
		for(int i = 0; i < n; i++){
			int a;
			cin >> a;
			ve.push_back(a);
		}
		if(n == 1){
			cout << "YES\n";
			continue;
		}
		if(n == 2){
	//		cout << "TÄLK\n";
			if(ve[0] == 1 && ve[1] == 2) cout << "YES\n";
			else cout << "NO\n";
			continue;
		}
		if(n == 3){
			if(ve[0] == 1 && ve[1] == 2 && ve[2] == 3) cout << "YES\n";
			else cout << "NO\n";
			continue;
		}
		if(n == 4){
			if((ve[0] == 1 && ve[1] == 2 && ve[2] == 3 && ve[3] == 4) || (ve[0] == 3 && ve[1] == 4 && ve[2] == 1 && ve[3] == 2)){
				cout << "YES\n";
			}else{
				cout << "NO\n";
			}
			continue;
		}
		int su = 0;
		for(int i = 0; i < ve.size(); i++){
			for(int j = i+1; j < ve.size(); j++){
				if(ve[i] > ve[j]) su++;
			}
		}
		if(su % 2 == 0) cout << "YES\n";
		else cout << "NO\n";
	}
}

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
...

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
...

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
...

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
...