CSES - Datatähti Open 2021 - Results
Submission details
Task:Split in Three
Sender:jenkinsser
Submission time:2021-01-31 13:27:14 +0200
Language:C++ (C++17)
Status:READY
Result:22
Feedback
groupverdictscore
#1ACCEPTED22
#20
Test results
testverdicttimegroup
#1ACCEPTED0.01 s1, 2details
#2ACCEPTED0.01 s1, 2details
#3ACCEPTED0.01 s1, 2details
#4ACCEPTED0.01 s1, 2details
#5ACCEPTED0.01 s1, 2details
#6ACCEPTED0.01 s1, 2details
#7ACCEPTED0.01 s1, 2details
#8ACCEPTED0.01 s1, 2details
#90.01 s2details
#100.01 s2details
#110.01 s2details
#12ACCEPTED0.01 s2details
#130.01 s2details
#140.01 s2details
#15ACCEPTED0.01 s2details

Code

#include <bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define st first
#define nd second
#define pii pair<int,int>
#define N 2000005
#define INF 1e9+5
#define sp " "
#define nl "\n"
#define all(x) x.begin(),x.end()
#define fastio() ios_base::sync_with_stdio(0);cin.tie(0);
#define fori(i,l,r) for(int i=l;i<=r;i++)
#define forf(i,r) fori(i,1,r)
#define rof(i,r,l) for(int i=r;i>=l;i--)
#define ll long long
#define int ll
using namespace std;
int binpow(int x,int y){
int ans=1;
for(;y>0;x*=x,y>>=1){
if(y&1)
ans*=x;
}
return ans;
}
void solve(){
int n;
cin >> n;
if(n==1){
cout << 1;
return;
}
if((n%3!=0&&(n+1)%3!=0)||n==41){
cout << "IMPOSSIBLE\n";
return;
}
if(n==3){
cout << "1 2 3";
return;
}
int sum=(n+1)*n/2;
sum/=3;
vector<int> ans(n+1,0);
if(sum%2==0){
ans[sum/2-1]=2;
ans[sum/2+1]=2;
ans[sum/2+2]=1;
ans[sum/2-3]=1;
for(int i=1;i<=n;i++){
if(ans[i])
cout << ans[i] << sp;
else
cout << 3 << sp;
}
}
else{
ans[sum/2]=2;
ans[sum/2+1]=2;
ans[sum/2-2]=1;
ans[sum/2+2]=1;
for(int i=1;i<=n;i++){
if(ans[i])
cout << ans[i] << sp;
else{
cout << 3 << sp;
}
}
}
}
int32_t main(){
fastio()
int t=1;
//cin >> t;
while(t--){
solve();
}
}

Test details

Test 1

Group: 1, 2

Verdict: ACCEPTED

input
3

correct output
1 2 3 

user output
1 2 3

Test 2

Group: 1, 2

Verdict: ACCEPTED

input
4

correct output
IMPOSSIBLE

user output
IMPOSSIBLE

Test 3

Group: 1, 2

Verdict: ACCEPTED

input
5

correct output
1 3 1 3 2 

user output
3 2 2 1 3 

Test 4

Group: 1, 2

Verdict: ACCEPTED

input
6

correct output
1 3 2 2 1 3 

user output
1 3 2 2 1 3 

Test 5

Group: 1, 2

Verdict: ACCEPTED

input
7

correct output
IMPOSSIBLE

user output
IMPOSSIBLE

Test 6

Group: 1, 2

Verdict: ACCEPTED

input
8

correct output
2 3 1 2 3 3 2 1 

user output
3 3 1 3 2 3 2 1 

Test 7

Group: 1, 2

Verdict: ACCEPTED

input
9

correct output
1 2 3 1 2 3 3 2 1 

user output
3 3 3 3 1 3 2 2 1 

Test 8

Group: 1, 2

Verdict: ACCEPTED

input
10

correct output
IMPOSSIBLE

user output
IMPOSSIBLE

Test 9

Group: 2

Verdict:

input
42

correct output
1 3 2 2 1 3 1 2 3 3 2 1 1 2 3 ...

user output
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 ...

Test 10

Group: 2

Verdict:

input
95

correct output
1 3 1 3 2 1 2 3 3 2 1 1 2 3 3 ...

user output
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 ...
Truncated

Test 11

Group: 2

Verdict:

input
96

correct output
1 3 2 2 1 3 1 2 3 3 2 1 1 2 3 ...

user output
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 ...
Truncated

Test 12

Group: 2

Verdict: ACCEPTED

input
97

correct output
IMPOSSIBLE

user output
IMPOSSIBLE

Test 13

Group: 2

Verdict:

input
98

correct output
2 3 1 2 3 3 2 1 1 2 3 3 2 1 1 ...

user output
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 ...
Truncated

Test 14

Group: 2

Verdict:

input
99

correct output
1 2 3 1 2 3 3 2 1 1 2 3 3 2 1 ...

user output
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 ...
Truncated

Test 15

Group: 2

Verdict: ACCEPTED

input
100

correct output
IMPOSSIBLE

user output
IMPOSSIBLE