CSES - Datatähti 2021 loppu

Submission details
Task:	Kolmijako
Sender:	AtskaFin
Submission time:	2021-01-23 17:21:04 +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 <iostream>
#include <vector>
 
using namespace std;
 
int n;
vector<int> nums;

vector<int> a;
vector<int> b;
vector<int> c;

int ans[101];

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  
  cin>>n;
 
  int x = (n*(n+1)/2-3)/3;

  if ((n-1) % 3 == 0) {
    cout << "IMPOSSIBLE";
  } else {
    nums.resize(n);
    for (int i = 1; i <= n; i++) nums[i-1] = i;

    // Muodostetaan joukko A
    int sum = 0;
    for (int i = nums.size()-1; i >= 0; i--) {
      if (sum+nums[i] <= x) {
        sum += nums[i];
        a.push_back(nums[i]);
        nums[i] = 0;
      }
    }

    for (int i = 0; i < n; i++) {
      if (sum == x) break;
      if (sum + nums[i] <= x) {
        sum += nums[i];
        a.push_back(nums[i]);
        nums[i] = 0;
      }
    }

    // Muodostetaan joukko B
    sum = 0;
    for (int i = nums.size()-1; i >= 0; i--) {
      if (sum+nums[i] <= x+1 && nums[i] > 0) {
        sum += nums[i];
        b.push_back(nums[i]);
        nums[i] = 0;
      }
    }

    for (int i = 0; i < n; i++) {
      if (sum == x+1) break;
      if (sum + nums[i] <= x+1 && nums[i] > 0) {
        sum += nums[i];
        b.push_back(nums[i]);
        nums[i] = 0;
      }
    }

    // Muodostetaan joukko C
    sum = 0;
    for (int i = nums.size()-1; i >= 0; i--) {
      if (sum+nums[i] <= x+2 && nums[i] > 0) {
        sum += nums[i];
        c.push_back(nums[i]);
        nums[i] = 0;
      }
    }

    for (int i = 0; i < n; i++) {
      if (sum == x+2) break;
      if (sum + nums[i] <= x+2 && nums[i] > 0) {
        sum += nums[i];
        c.push_back(nums[i]);
        nums[i] = 0;
      }
    }

    // Tulostetaan vastaus


    for (int i : a) {
      ans[i] = 1;
    }
    for (int i : b) {
      ans[i] = 2;
    }
    for (int i : c) {
      ans[i] = 3;
    }

    for (int i = 1; i <= n; i++) cout << ans[i] << " ";
  }
}

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
`3 3 3 1 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
`3 3 1 3 2 3 2 1` 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
`3 3 3 3 1 3 2 2 1` 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
`3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 ...` 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
`3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 ...` 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
`3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 ...` 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
`3 3 3 3 1 3 3 3 3 3 3 3 3 3 3 ...` 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
`3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 ...` Truncated

Test 15

Group: 2

Verdict: ACCEPTED

input
`100` view save

correct output
`IMPOSSIBLE` view save

user output
`IMPOSSIBLE` view save

Datatähti 2021 loppu

Kolmijako

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 (AtskaFin)