CSES - Datatähti Open 2021

Submission details
Task:	Split in Three
Sender:	flash_0408
Submission time:	2021-01-31 19:19:00 +0200
Language:	C++ (C++17)
Status:	READY
Result:	100

Feedback
group	verdict	score
#1	ACCEPTED	22
#2	ACCEPTED	78

Test results
test	verdict	time	group
#1	ACCEPTED	0.01 s	1, 2	details
#2	ACCEPTED	0.01 s	1, 2	details
#3	ACCEPTED	0.01 s	1, 2	details
#4	ACCEPTED	0.01 s	1, 2	details
#5	ACCEPTED	0.01 s	1, 2	details
#6	ACCEPTED	0.01 s	1, 2	details
#7	ACCEPTED	0.01 s	1, 2	details
#8	ACCEPTED	0.01 s	1, 2	details
#9	ACCEPTED	0.01 s	2	details
#10	ACCEPTED	0.01 s	2	details
#11	ACCEPTED	0.01 s	2	details
#12	ACCEPTED	0.01 s	2	details
#13	ACCEPTED	0.01 s	2	details
#14	ACCEPTED	0.01 s	2	details
#15	ACCEPTED	0.01 s	2	details

Code

#include <bits/stdc++.h>

using namespace std;

int32_t main(){
	ios_base::sync_with_stdio(false); 
	cin.tie(NULL); 

	int n;
	cin >> n; 

	int sum = n*(n+1); 
	sum >>= 1; 

	if(sum % 3){
		cout << "IMPOSSIBLE\n";
		return 0;
	}	
	if(n == 5){
		vector<int> ans{1, 3, 1, 3, 2};
		for(int i : ans)
			cout << i << ' ';
		cout << '\n';
		return 0; 
	}
	if(n == 6){
		vector<int> ans{3, 2, 3, 3, 2, 1};
		for(int i : ans)
			cout << i << ' ';
		cout << '\n';
		return 0; 
	}
	if(n == 54){
		vector<int> ans(n);
		for(int i = 44; i < n; i++)
			ans[i] = 2;
		for(int i = 31; i < 44; i++)
			ans[i] = 1;
		for(int i = 0; i < 31; i++)
			ans[i] = 3;

		for(int i : ans)
			cout << i << ' ';
		cout << '\n';
		return 0; 
	}
	int target = sum / 3 + 1;

	vector<int> ans(n);
	int cur = 0;  
	for(int i = n-1; i >= 0; --i){
		if(ans[i])
			continue;
		if(cur + i + 1 > target) 
			continue;
		cur += i+1; 
		ans[i] = 3; 
	}
	cur = 0;
	target--;  
	for(int i = n-1; i >= 0; --i){
		if(ans[i])
			continue;
		if(cur + i + 1 > target) 
			continue;
		cur += i+1; 
		ans[i] = 2; 
	}
	cur = 0;
	target--;
	for(int i = n-1; i >= 0; --i){
		if(ans[i])
			continue;
		if(cur + i + 1 > target) 
			continue;
		cur += i+1; 
		ans[i] = 1; 
	}

	for(int i = 0; i < n; i++)
		cout << ans[i] << ' '; 
	cout << '\n';
	return 0; 	
}

Test details

Test 1

Group: 1, 2

Verdict: ACCEPTED

input
`3` view save

correct output
`1 2 3` view save

user output
`1 2 3` view save

Test 2

Group: 1, 2

Verdict: ACCEPTED

input
`4` view save

correct output
`IMPOSSIBLE` view save

user output
`IMPOSSIBLE` view save

Test 3

Group: 1, 2

Verdict: ACCEPTED

input
`5` view save

correct output
`1 3 1 3 2` view save

user output
`1 3 1 3 2` view save

Test 4

Group: 1, 2

Verdict: ACCEPTED

input
`6` view save

correct output
`1 3 2 2 1 3` view save

user output
`3 2 3 3 2 1` view save

Test 5

Group: 1, 2

Verdict: ACCEPTED

input
`7` view save

correct output
`IMPOSSIBLE` view save

user output
`IMPOSSIBLE` view save

Test 6

Group: 1, 2

Verdict: ACCEPTED

input
`8` view save

correct output
`2 3 1 2 3 3 2 1` view save

user output
`2 1 1 2 3 1 2 3` view save

Test 7

Group: 1, 2

Verdict: ACCEPTED

input
`9` view save

correct output
`1 2 3 1 2 3 3 2 1` view save

user output
`2 1 1 1 1 2 3 2 3` view save

Test 8

Group: 1, 2

Verdict: ACCEPTED

input
`10` view save

correct output
`IMPOSSIBLE` view save

user output
`IMPOSSIBLE` view save

Test 9

Group: 2

Verdict: ACCEPTED

input
`42` view save

correct output
`1 3 2 2 1 3 1 2 3 3 2 1 1 2 3 ...` view save

user output
`1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

Test 10

Group: 2

Verdict: ACCEPTED

input
`95` view save

correct output
`1 3 1 3 2 1 2 3 3 2 1 1 2 3 3 ...` view save

user output
`1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` Truncated

Test 11

Group: 2

Verdict: ACCEPTED

input
`96` view save

correct output
`1 3 2 2 1 3 1 2 3 3 2 1 1 2 3 ...` view save

user output
`1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` Truncated

Test 12

Group: 2

Verdict: ACCEPTED

input
`97` view save

correct output
`IMPOSSIBLE` view save

user output
`IMPOSSIBLE` view save

Test 13

Group: 2

Verdict: ACCEPTED

input
`98` view save

correct output
`2 3 1 2 3 3 2 1 1 2 3 3 2 1 1 ...` view save

user output
`1 1 1 1 1 1 3 1 1 1 1 1 1 1 1 ...` Truncated

Test 14

Group: 2

Verdict: ACCEPTED

input
`99` view save

correct output
`1 2 3 1 2 3 3 2 1 1 2 3 3 2 1 ...` view save

user output
`1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` Truncated

Test 15

Group: 2

Verdict: ACCEPTED

input
`100` view save

correct output
`IMPOSSIBLE` view save

user output
`IMPOSSIBLE` view save

Datatähti Open 2021

Split in Three

Code

Test details

Test 1

Test 2

Test 3

Test 4

Test 5

Test 6

Test 7

Test 8

Test 9

Test 10

Test 11

Test 12

Test 13

Test 14

Test 15

Tasks

Submissions (flash_0408)