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ContestId |
Name |
Phase |
Frozen |
Duration (Seconds) |
Relative Time |
Start Time |
|---|---|---|---|---|---|---|
| 2189 | Codeforces Round 1075 (Div. 2) | FINISHED | False | 7200 | 7226723 | Jan. 23, 2026, 2:35 p.m. |
Solved |
Index |
Name |
Type |
Tags |
Community Tag |
Rating |
|---|---|---|---|---|---|---|
| ( 6133 ) | C2 | XOR-convenience (Hard Version) | PROGRAMMING | bitmasks brute force constructive algorithms math |
This is the hard version of the problem. The difference between the versions is that in this version, (1 \le i \le n-1). Note that a correct solution for the hard version is not necessarily a correct solution for the easy version. Given a positive integer (n). Find some permutation(^{\text{∗}}) (p) of length (n) such that for every (i) ((\style{color:red}{1 \le i \le n-1})) there exists (j) ((\style{color:red}{i \le j \le n})) such that (p_i = p_j \oplus i) (^{\text{†}}), or determine that it does not exist. (^{\text{∗}})A permutation of length (n) is an array consisting of (n) distinct integers from (1) to (n) in arbitrary order. For example, (2,3,1,5,4) is a permutation, but (1,2,2) is not a permutation ((2) appears twice in the array), and (1,3,4) is also not a permutation ((n=3) but there is (4) in the array). (^{\text{†}})(\oplus) denotes the bitwise XOR operation . Each test contains multiple test cases. The first line contains the number of test cases (t) ((1 \le t \le 10^4)). The description of the test cases follows. The only line of each test case contains one positive integer (n) ((3 \leq n \leq 2 \cdot 10^5)) — the length of the permutation. It is guaranteed that the sum of (n) over all test cases does not exceed (2\cdot 10^5). For each test case, if there is a suitable permutation, output (n) integers (p_1,p_2,\ldots,p_n) — the permutation (p). Otherwise, output (-1). If multiple solutions exist, output any of them. In the first test case, the permutation (p = 2,1,3) fulfills the condition, as (p_2 = 1) and (p_3 \oplus 2 = 1). In the second test case, there is no suitable permutation. |
| Codeforces Round 1075 (Div. 2) Editorial |
Submission Id |
Author(s) |
Index |
Submitted |
Verdict |
Language |
Test Set |
Tests Passed |
Time taken (ms) |
Memory Consumed (bytes) |
Tags |
Rating |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 359504238 | _Equinox | C2 | Jan. 24, 2026, 6 a.m. | OK | C# 13 | TESTS | 12 | 93 | 15667200 | ||
| 359496888 | Tumi_Dusto | C2 | Jan. 24, 2026, 5:02 a.m. | OK | C++17 (GCC 7-32) | TESTS | 12 | 46 | 0 | ||
| 359481151 | bruh05 | C2 | Jan. 23, 2026, 11:25 p.m. | OK | C++17 (GCC 7-32) | TESTS | 12 | 46 | 0 | ||
| 359480154 | RockingMat | C2 | Jan. 23, 2026, 10:52 p.m. | OK | C++17 (GCC 7-32) | TESTS | 12 | 46 | 0 | ||
| 359474756 | Gaurish16 | C2 | Jan. 23, 2026, 8:54 p.m. | OK | C++17 (GCC 7-32) | TESTS | 12 | 46 | 0 | ||
| 359474332 | crankyvirgo | C2 | Jan. 23, 2026, 8:47 p.m. | OK | C++17 (GCC 7-32) | TESTS | 12 | 46 | 0 | ||
| 359454725 | jonatas57 | C2 | Jan. 23, 2026, 5:37 p.m. | OK | C++17 (GCC 7-32) | TESTS | 12 | 46 | 0 | ||
| 359452450 | Silas_Li | C2 | Jan. 23, 2026, 5:23 p.m. | OK | C++17 (GCC 7-32) | TESTS | 12 | 46 | 0 | ||
| 359450310 | _Ramdas_ | C2 | Jan. 23, 2026, 5:11 p.m. | OK | C++17 (GCC 7-32) | TESTS | 12 | 46 | 0 | ||
| 359445232 | 000nobody000 | C2 | Jan. 23, 2026, 4:33 p.m. | OK | C++17 (GCC 7-32) | TESTS | 12 | 46 | 0 | ||
| 359443384 | gong.teng | C2 | Jan. 23, 2026, 4:30 p.m. | OK | C++17 (GCC 7-32) | TESTS | 12 | 46 | 0 | ||
| 359500445 | Syntaxerror31223 | C2 | Jan. 24, 2026, 5:33 a.m. | OK | C++20 (GCC 13-64) | TESTS | 12 | 31 | 0 | ||
| 359471255 | ami1_code | C2 | Jan. 23, 2026, 8:05 p.m. | OK | C++20 (GCC 13-64) | TESTS | 12 | 31 | 0 | ||
| 359467915 | turska | C2 | Jan. 23, 2026, 7:26 p.m. | OK | C++20 (GCC 13-64) | TESTS | 12 | 31 | 0 | ||
| 359449392 | SherLocked25 | C2 | Jan. 23, 2026, 5:07 p.m. | OK | C++20 (GCC 13-64) | TESTS | 12 | 31 | 0 | ||
| 359445692 | wildhonestfur | C2 | Jan. 23, 2026, 4:33 p.m. | OK | C++20 (GCC 13-64) | TESTS | 12 | 31 | 0 | ||
| 359490501 | yuanmouren | C2 | Jan. 24, 2026, 3:29 a.m. | OK | C++20 (GCC 13-64) | TESTS | 12 | 31 | 102400 | ||
| 359473911 | PipRa | C2 | Jan. 23, 2026, 8:41 p.m. | OK | C++20 (GCC 13-64) | TESTS | 12 | 31 | 307200 | ||
| 359486887 | czkczk | C2 | Jan. 24, 2026, 2:20 a.m. | OK | C++20 (GCC 13-64) | TESTS | 12 | 31 | 7987200 | ||
| 359505252 | Devesh77 | C2 | Jan. 24, 2026, 6:07 a.m. | OK | C++20 (GCC 13-64) | TESTS | 12 | 46 | 0 | ||
| 359504837 | anotherworld | C2 | Jan. 24, 2026, 6:04 a.m. | OK | C++20 (GCC 13-64) | TESTS | 12 | 46 | 0 | ||
| 359504376 | PrecipiceBlades | C2 | Jan. 24, 2026, 6:01 a.m. | OK | C++23 (GCC 14-64, msys2) | TESTS | 12 | 31 | 0 | ||
| 359503140 | ranjit_thegreat | C2 | Jan. 24, 2026, 5:52 a.m. | OK | C++23 (GCC 14-64, msys2) | TESTS | 12 | 31 | 0 | ||
| 359498810 | bitcrafter | C2 | Jan. 24, 2026, 5:19 a.m. | OK | C++23 (GCC 14-64, msys2) | TESTS | 12 | 31 | 0 | ||
| 359490984 | AsobinoKankei | C2 | Jan. 24, 2026, 3:38 a.m. | OK | C++23 (GCC 14-64, msys2) | TESTS | 12 | 31 | 0 | ||
| 359488821 | Ek1t1kE | C2 | Jan. 24, 2026, 2:57 a.m. | OK | C++23 (GCC 14-64, msys2) | TESTS | 12 | 31 | 0 | ||
| 359470075 | krishna_saini | C2 | Jan. 23, 2026, 7:51 p.m. | OK | C++23 (GCC 14-64, msys2) | TESTS | 12 | 31 | 0 | ||
| 359469844 | MrWizard_574 | C2 | Jan. 23, 2026, 7:49 p.m. | OK | C++23 (GCC 14-64, msys2) | TESTS | 12 | 31 | 0 | ||
| 359464813 | suchethxplayer | C2 | Jan. 23, 2026, 6:55 p.m. | OK | C++23 (GCC 14-64, msys2) | TESTS | 12 | 31 | 0 | ||
| 359456396 | Mishra_2006 | C2 | Jan. 23, 2026, 5:50 p.m. | OK | C++23 (GCC 14-64, msys2) | TESTS | 12 | 31 | 0 | ||
| 359455438 | Tokisaki.kurumi | C2 | Jan. 23, 2026, 5:42 p.m. | OK | C++23 (GCC 14-64, msys2) | TESTS | 12 | 31 | 0 | ||
| 359457209 | 1435730 | C2 | Jan. 23, 2026, 5:55 p.m. | OK | GNU C11 | TESTS | 12 | 62 | 1638400 | ||
| 359443097 | bablu_escobar | C2 | Jan. 23, 2026, 4:29 p.m. | OK | GNU C11 | TESTS | 12 | 890 | 1638400 | ||
| 359501824 | yiren | C2 | Jan. 24, 2026, 5:43 a.m. | OK | Go | TESTS | 12 | 62 | 21299200 | ||
| 359500801 | yiren_2 | C2 | Jan. 24, 2026, 5:35 a.m. | OK | Go | TESTS | 12 | 62 | 21299200 | ||
| 359443509 | glebsamsonov | C2 | Jan. 23, 2026, 4:30 p.m. | OK | Go | TESTS | 12 | 109 | 3379200 | ||
| 359451402 | buitS | C2 | Jan. 23, 2026, 5:17 p.m. | OK | Java 21 | TESTS | 12 | 218 | 512000 | ||
| 359470140 | keshav_.agg | C2 | Jan. 23, 2026, 7:52 p.m. | OK | Java 21 | TESTS | 12 | 234 | 1331200 | ||
| 359450880 | buitS | C2 | Jan. 23, 2026, 5:14 p.m. | OK | Java 21 | TESTS | 12 | 250 | 307200 | ||
| 359452818 | vineetiwari | C2 | Jan. 23, 2026, 5:25 p.m. | OK | Java 21 | TESTS | 12 | 250 | 614400 | ||
| 359443399 | xmjlove | C2 | Jan. 23, 2026, 4:30 p.m. | OK | Java 21 | TESTS | 12 | 250 | 819200 | ||
| 359499998 | SujalJainn | C2 | Jan. 24, 2026, 5:29 a.m. | OK | Java 21 | TESTS | 12 | 250 | 1126400 | ||
| 359471277 | Satyasarthi | C2 | Jan. 23, 2026, 8:05 p.m. | OK | Java 21 | TESTS | 12 | 265 | 1945600 | ||
| 359497600 | balu2907 | C2 | Jan. 24, 2026, 5:08 a.m. | OK | Java 21 | TESTS | 12 | 265 | 15974400 | ||
| 359471551 | ghost_248 | C2 | Jan. 23, 2026, 8:09 p.m. | OK | Java 21 | TESTS | 12 | 296 | 716800 | ||
| 359439951 | LostDaemon | C2 | Jan. 23, 2026, 4:24 p.m. | OK | Java 21 | TESTS | 12 | 296 | 819200 | ||
| 359475725 | public-static-void-main | C2 | Jan. 23, 2026, 9:12 p.m. | OK | Java 8 | TESTS | 12 | 250 | 16896000 | ||
| 359478799 | divyanshvijay079 | C2 | Jan. 23, 2026, 10:14 p.m. | OK | Java 8 | TESTS | 12 | 296 | 0 | ||
| 359453096 | kevin_0911 | C2 | Jan. 23, 2026, 5:27 p.m. | OK | Java 8 | TESTS | 12 | 296 | 0 | ||
| 359480545 | tin.le2 | C2 | Jan. 23, 2026, 11:05 p.m. | OK | Kotlin 1.7 | TESTS | 12 | 359 | 30412800 | ||
| 359459680 | SanjarAlgo | C2 | Jan. 23, 2026, 6:13 p.m. | OK | PascalABC.NET | TESTS | 12 | 546 | 1740800 | ||
| 359467339 | Arvind215271 | C2 | Jan. 23, 2026, 7:21 p.m. | OK | PyPy 3 | TESTS | 12 | 406 | 9420800 | ||
| 359449437 | 999Wfan | C2 | Jan. 23, 2026, 5:07 p.m. | OK | PyPy 3 | TESTS | 12 | 453 | 11980800 | ||
| 359487939 | kaushik.atla | C2 | Jan. 24, 2026, 2:42 a.m. | OK | PyPy 3-64 | TESTS | 12 | 78 | 7884800 | ||
| 359461338 | abdullah_iw | C2 | Jan. 23, 2026, 6:25 p.m. | OK | PyPy 3-64 | TESTS | 12 | 93 | 9932800 | ||
| 359456752 | mathiaswk | C2 | Jan. 23, 2026, 5:52 p.m. | OK | PyPy 3-64 | TESTS | 12 | 93 | 15769600 | ||
| 359499785 | sharmaujjwal5706 | C2 | Jan. 24, 2026, 5:27 a.m. | OK | PyPy 3-64 | TESTS | 12 | 109 | 9113600 | ||
| 359464087 | rishivk_144 | C2 | Jan. 23, 2026, 6:49 p.m. | OK | PyPy 3-64 | TESTS | 12 | 109 | 13516800 | ||
| 359458935 | longjourney | C2 | Jan. 23, 2026, 6:08 p.m. | OK | PyPy 3-64 | TESTS | 12 | 109 | 15462400 | ||
| 359460082 | know_pain | C2 | Jan. 23, 2026, 6:16 p.m. | OK | PyPy 3-64 | TESTS | 12 | 109 | 15872000 | ||
| 359446618 | BlackSwanBase | C2 | Jan. 23, 2026, 4:34 p.m. | OK | PyPy 3-64 | TESTS | 12 | 109 | 16793600 | ||
| 359474967 | isa773 | C2 | Jan. 23, 2026, 8:58 p.m. | OK | PyPy 3-64 | TESTS | 12 | 109 | 21504000 | ||
| 359453370 | harvsftw | C2 | Jan. 23, 2026, 5:29 p.m. | OK | PyPy 3-64 | TESTS | 12 | 125 | 12800000 | ||
| 359439371 | Jimanbanashi | C2 | Jan. 23, 2026, 4:23 p.m. | OK | Python 2 | TESTS | 12 | 218 | 15257600 | ||
| 359444334 | rakshit__modi | C2 | Jan. 23, 2026, 4:31 p.m. | OK | Python 3 | TESTS | 12 | 156 | 16179200 | ||
| 359463119 | AryansinghSonaye | C2 | Jan. 23, 2026, 6:40 p.m. | OK | Python 3 | TESTS | 12 | 265 | 8294400 | ||
| 359439656 | khantnandeesh3205 | C2 | Jan. 23, 2026, 4:24 p.m. | OK | Python 3 | TESTS | 12 | 281 | 10035200 | ||
| 359465217 | Jothiram_7 | C2 | Jan. 23, 2026, 6:59 p.m. | OK | Python 3 | TESTS | 12 | 281 | 11161600 | ||
| 359459342 | ok12 | C2 | Jan. 23, 2026, 6:11 p.m. | OK | Python 3 | TESTS | 12 | 312 | 20275200 | ||
| 359501669 | Aizon | C2 | Jan. 24, 2026, 5:42 a.m. | OK | Rust 2021 | TESTS | 12 | 62 | 2150400 | ||
| 359474045 | charles0123 | C2 | Jan. 23, 2026, 8:43 p.m. | OK | Rust 2024 | TESTS | 12 | 46 | 0 |
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