CSES - Datatähti 2025 loppu

Submission details
Task:	Permutaatio
Sender:	vgtcross
Submission time:	2025-01-18 14:11:00 +0200
Language:	C++ (C++20)
Status:	READY
Result:	100

Feedback
group	verdict	score
#1	ACCEPTED	12
#2	ACCEPTED	33
#3	ACCEPTED	55

Test results
test	verdict	time	group
#1	ACCEPTED	0.01 s	1, 2, 3	details
#2	ACCEPTED	0.01 s	1, 2, 3	details
#3	ACCEPTED	0.01 s	1, 2, 3	details
#4	ACCEPTED	0.01 s	1, 2, 3	details
#5	ACCEPTED	0.01 s	1, 2, 3	details
#6	ACCEPTED	0.01 s	1, 2, 3	details
#7	ACCEPTED	0.01 s	1, 2, 3	details
#8	ACCEPTED	0.01 s	1, 2, 3	details
#9	ACCEPTED	0.01 s	1, 2, 3	details
#10	ACCEPTED	0.01 s	1, 2, 3	details
#11	ACCEPTED	0.01 s	2, 3	details
#12	ACCEPTED	0.01 s	2, 3	details
#13	ACCEPTED	0.01 s	2, 3	details
#14	ACCEPTED	0.01 s	2, 3	details
#15	ACCEPTED	0.01 s	2, 3	details
#16	ACCEPTED	0.14 s	3	details
#17	ACCEPTED	0.14 s	3	details
#18	ACCEPTED	0.10 s	3	details
#19	ACCEPTED	0.09 s	3	details
#20	ACCEPTED	0.06 s	3	details
#21	ACCEPTED	0.01 s	1, 2, 3	details
#22	ACCEPTED	0.01 s	2, 3	details
#23	ACCEPTED	0.07 s	3	details

Compiler report

input/code.cpp: In function 'void solve()':
input/code.cpp:38:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |         if (a > lis.size()) {
      |             ~~^~~~~~~~~~~~
input/code.cpp:44:24: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   44 |         if (lis.size() > a) {
      |             ~~~~~~~~~~~^~~
input/code.cpp:55:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |         if (a > lis.size()) {
      |             ~~^~~~~~~~~~~~
input/code.cpp:61:24: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   61 |         if (lis.size() > a) {
      |...

Code

#include <bits/stdc++.h>

#define debug(x) cout << #x << ": " << x << endl
#define fi first
#define se second
#define all(x) begin(x),end(x)
#define rall(x) rbegin(x),rend(x)

using namespace std;
using ll = long long;

const int N = 200200;

vector<int> adj[N];
int st[N];
vector<int> ord;

bool dfs(int u) {
    if (st[u] == 1) return 1;
    if (st[u] == 2) return 0;
    st[u] = 1;
    for (int v : adj[u]) {
        if (dfs(v)) return 1;
    }
    st[u] = 2;
    ord.push_back(u);
    return 0;
}

void solve() {
    int n;
    cin >> n;

    vector<int> lis(1, -1);
    for (int i = 0; i < n; ++i) {
        int a;
        cin >> a;
        if (a > lis.size()) {
            cout << "IMPOSSIBLE\n";
            return;
        }

        if (lis[a-1] != -1) adj[lis[a-1]].push_back(i);
        if (lis.size() > a) {
            adj[i].push_back(lis[a]);
            lis[a] = i;
        } else lis.push_back(i);
    }

    vector<int> b(n);
    lis = vector(1, -1);
    for (int &i : b) cin >> i;
    for (int i = n-1; i >= 0; --i) {
        int a = b[i];
        if (a > lis.size()) {
            cout << "IMPOSSIBLE\n";
            return;
        }

        if (lis[a-1] != -1) adj[lis[a-1]].push_back(i);
        if (lis.size() > a) {
            adj[i].push_back(lis[a]);
            lis[a] = i;
        } else lis.push_back(i);
    }

    for (int i = 0; i < n; ++i) {
        if (dfs(i)) {
            cout << "IMPOSSIBLE\n";
            return;
        }
    }

    vector<int> ans(n);
    for (int i = 0; i < n; ++i) ans[ord[i]] = n-i;
    for (int i = 0; i < n; ++i) cout << ans[i] << " \n"[i == n-1];
}

int main() {
    cin.tie(0) -> sync_with_stdio(0);

    solve();
}

Test details

Test 1

Group: 1, 2, 3

Verdict: ACCEPTED

input
`1 1 1` view save

correct output
`1` view save

user output
`1` view save

Test 2

Group: 1, 2, 3

Verdict: ACCEPTED

input
`2 1 1 1 1` view save

correct output
`IMPOSSIBLE` view save

user output
`IMPOSSIBLE` view save

Test 3

Group: 1, 2, 3

Verdict: ACCEPTED

input
`3 1 1 3 3 2 1` view save

correct output
`IMPOSSIBLE` view save

user output
`IMPOSSIBLE` view save

Test 4

Group: 1, 2, 3

Verdict: ACCEPTED

input
`3 1 3 2 2 1 3` view save

correct output
`IMPOSSIBLE` view save

user output
`IMPOSSIBLE` view save

Test 5

Group: 1, 2, 3

Verdict: ACCEPTED

input
`5 1 2 3 4 5 2 1 1 1 1` view save

correct output
`IMPOSSIBLE` view save

user output
`IMPOSSIBLE` view save

Test 6

Group: 1, 2, 3

Verdict: ACCEPTED

input
`8 1 2 2 3 2 3 4 5 1 3 2 2 1 1 1 1` view save

correct output
`1 8 5 7 2 3 4 6` view save

user output
`1 8 6 7 2 3 4 5` view save

Test 7

Group: 1, 2, 3

Verdict: ACCEPTED

input
`8 1 2 2 2 1 3 2 1 3 5 4 3 2 3 2 1` view save

correct output
`3 8 6 5 2 7 4 1` view save

user output
`4 8 7 5 2 6 3 1` view save

Test 8

Group: 1, 2, 3

Verdict: ACCEPTED

input
`8 1 2 3 4 5 6 7 8 1 1 1 1 1 1 1 1` view save

correct output
`1 2 3 4 5 6 7 8` view save

user output
`1 2 3 4 5 6 7 8` view save

Test 9

Group: 1, 2, 3

Verdict: ACCEPTED

input
`8 1 1 1 1 1 1 1 1 8 7 6 5 4 3 2 1` view save

correct output
`8 7 6 5 4 3 2 1` view save

user output
`8 7 6 5 4 3 2 1` view save

Test 10

Group: 1, 2, 3

Verdict: ACCEPTED

input
`8 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1` view save

correct output
`IMPOSSIBLE` view save

user output
`IMPOSSIBLE` view save

Test 11

Group: 2, 3

Verdict: ACCEPTED

input
`500 1 2 2 3 4 4 5 4 6 4 7 8 5 7 9 ...` view save

correct output
`25 205 54 76 500 218 316 181 3...` view save

user output
`61 348 123 132 500 350 446 263...` Truncated

Test 12

Group: 2, 3

Verdict: ACCEPTED

input
`500 1 2 3 1 1 2 2 4 1 3 5 3 3 3 4 ...` view save

correct output
`336 388 404 309 233 377 240 42...` view save

user output
`447 472 480 425 382 450 383 48...` Truncated

Test 13

Group: 2, 3

Verdict: ACCEPTED

input
`500 1 2 3 4 5 6 7 8 9 10 11 12 13 ...` view save

correct output
`1 2 3 4 5 6 7 8 9 10 11 12 13 ...` view save

user output
`1 2 3 4 5 6 7 8 9 10 11 12 13 ...` Truncated

Test 14

Group: 2, 3

Verdict: ACCEPTED

input
`500 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`500 499 498 497 496 495 494 49...` view save

user output
`500 499 498 497 496 495 494 49...` Truncated

Test 15

Group: 2, 3

Verdict: ACCEPTED

input
`500 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`IMPOSSIBLE` view save

user output
`IMPOSSIBLE` view save

Test 16

Group: 3

Verdict: ACCEPTED

input
`200000 1 2 2 3 2 1 3 3 2 4 2 3 5 4 5 ...` view save

correct output
`12162 165274 130162 168624 391...` view save

user output
`21215 194329 178186 194446 790...` Truncated

Test 17

Group: 3

Verdict: ACCEPTED

input
`200000 1 1 2 3 3 2 4 3 4 5 2 5 6 7 3 ...` view save

correct output
`191389 13806 133836 173924 159...` view save

user output
`199685 22734 181920 197146 193...` Truncated

Test 18

Group: 3

Verdict: ACCEPTED

input
`200000 1 2 3 4 5 6 7 8 9 10 11 12 13 ...` view save

correct output
`1 2 3 4 5 6 7 8 9 10 11 12 13 ...` view save

user output
`1 2 3 4 5 6 7 8 9 10 11 12 13 ...` Truncated

Test 19

Group: 3

Verdict: ACCEPTED

input
`200000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`200000 199999 199998 199997 19...` view save

user output
`200000 199999 199998 199997 19...` Truncated

Test 20

Group: 3

Verdict: ACCEPTED

input
`200000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...` view save

correct output
`IMPOSSIBLE` view save

user output
`IMPOSSIBLE` view save

Test 21

Group: 1, 2, 3

Verdict: ACCEPTED

input
`8 1 1 2 1 2 3 1 3 4 3 3 2 2 3 1 1` view save

correct output
`IMPOSSIBLE` view save

user output
`IMPOSSIBLE` view save

Test 22

Group: 2, 3

Verdict: ACCEPTED

input
`500 1 2 3 2 1 2 1 2 3 3 3 3 4 1 5 ...` view save

correct output
`IMPOSSIBLE` view save

user output
`IMPOSSIBLE` view save

Test 23

Group: 3

Verdict: ACCEPTED

input
`200000 1 1 1 2 2 3 1 3 4 1 5 4 2 5 6 ...` view save

correct output
`IMPOSSIBLE` view save

user output
`IMPOSSIBLE` view save

Datatähti 2025 loppu

Permutaatio

Compiler report

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

Test 16

Test 17

Test 18

Test 19

Test 20

Test 21

Test 22

Test 23

Tasks

Submissions (vgtcross)