Educational Codeforces Round 194 (Rated for Div. 2)

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ContestId
Name
Phase
Frozen
Duration (Seconds)
Relative Time
Start Time
2260 Educational Codeforces Round 194 (Rated for Div. 2) FINISHED False 7200 2388300 Sept. 8, 2026, 2:35 p.m.

Problems

Solved
Index
Name
Type
Tags
Community Tag
Rating
( 232 ) G Sortable Permutations PROGRAMMING brute force combinatorics math number theory

A permutation of size (n) is an array of length (n) in which every integer from (1) to (n) appears exactly once. We call a permutation sortable if there exists an integer (x\ge 2) such that the following property holds: if we remove from the permutation all elements at positions divisible by (x), then the remaining array is strictly increasing. In other words, the elements at positions (x,2x,3x,\ldots), not exceeding (n), are removed, the order of the remaining elements is unchanged, and the resulting array must be strictly increasing. Positions are numbered starting from (1). Count the number of sortable permutations of size (n). Since the answer may be very large, output it modulo (998244353). The only line contains one integer (n) ((1\le n\le 2\cdot10^5)) — the size of the permutation. Output one integer — the number of sortable permutations of size (n), taken modulo (998244353). In the first example, the only permutation is (1). For (x=2), nothing is removed, and the sequence is already sorted. In the second example, the sortable permutations are (1,2,3), (1,3,2), (2,1,3), and (2,3,1). For example, for the permutation (2,1,3), (x=2) works: after removing the second element, the sequence (2,3) remains. In the third example, one of the sortable permutations is (1,3,6,4,5,2). For (x=3), the elements at positions (3) and (6) are removed, after which the strictly increasing sequence (1,3,4,5) remains.

Tutorials

156529

Submissions

Submission Id
Author(s)
Index
Submitted
Verdict
Language
Test Set
Tests Passed
Time taken (ms)
Memory Consumed (bytes)
Tags
Rating
390146042 Midhilesh G Sept. 9, 2026, 9 p.m. OK C++17 (GCC 7-32) TESTS 19 62 2048000
389969651 0nsec G Sept. 8, 2026, 7:08 p.m. OK C++17 (GCC 7-32) TESTS 19 78 13926400
389957474 Shiv_am__08 G Sept. 8, 2026, 5:03 p.m. OK C++17 (GCC 7-32) TESTS 19 93 3276800
389966163 subhankarsutradhar2004 G Sept. 8, 2026, 6:23 p.m. OK C++17 (GCC 7-32) TESTS 19 93 7270400
389989440 hardikdhingra150 G Sept. 9, 2026, 3:53 a.m. OK C++17 (GCC 7-32) TESTS 19 781 70348800
390145871 Midhilesh G Sept. 9, 2026, 8:56 p.m. OK C++17 (GCC 7-32) TESTS 19 796 70348800
390099965 parthkumar1802 G Sept. 9, 2026, 2:14 p.m. OK C++17 (GCC 7-32) TESTS 19 843 103219200
390109354 IlllIlll G Sept. 9, 2026, 3:14 p.m. OK C++17 (GCC 7-32) TESTS 19 1171 3891200
390063903 JPMM G Sept. 9, 2026, 10:48 a.m. OK C++17 (GCC 7-32) TESTS 19 1484 105881600
389975852 UltimateChoker G Sept. 8, 2026, 9:02 p.m. OK C++17 (GCC 7-32) TESTS 19 2750 205312000
390090143 masy2011 G Sept. 9, 2026, 1:43 p.m. OK C++20 (GCC 13-64) TESTS 19 93 4403200
390005372 Acc_Robin G Sept. 9, 2026, 7:58 a.m. OK C++20 (GCC 13-64) TESTS 19 93 5222400
389963371 GrandMasterRED G Sept. 8, 2026, 5:54 p.m. OK C++20 (GCC 13-64) TESTS 19 93 6451200
390024460 gopal.thecoder G Sept. 9, 2026, 9:34 a.m. OK C++20 (GCC 13-64) TESTS 19 93 7270400
390139304 zapmind G Sept. 9, 2026, 6:59 p.m. OK C++20 (GCC 13-64) TESTS 19 140 11878400
389968462 415411 G Sept. 8, 2026, 6:51 p.m. OK C++20 (GCC 13-64) TESTS 19 734 116531200
390011070 khanhtai G Sept. 9, 2026, 9:09 a.m. OK C++20 (GCC 13-64) TESTS 19 968 94822400
389970037 d0610 G Sept. 8, 2026, 7:14 p.m. OK C++20 (GCC 13-64) TESTS 19 2031 404684800
389972449 11rrrr G Sept. 8, 2026, 7:53 p.m. OK C++20 (GCC 13-64) TESTS 19 2109 402022400
389988994 no_more_noip258 G Sept. 9, 2026, 3:44 a.m. OK C++20 (GCC 13-64) TESTS 19 2187 500736000
390098559 jiangly G Sept. 9, 2026, 2:02 p.m. OK C++23 (GCC 14-64, msys2) TESTS 19 78 2048000
389989366 jackylova_fan_fan_fan G Sept. 9, 2026, 3:51 a.m. OK C++23 (GCC 14-64, msys2) TESTS 19 78 5324800
389996634 ankitraj803120 G Sept. 9, 2026, 6:05 a.m. OK C++23 (GCC 14-64, msys2) TESTS 19 93 2150400
389968709 adityajay6661 G Sept. 8, 2026, 6:55 p.m. OK C++23 (GCC 14-64, msys2) TESTS 19 93 4198400
390053097 Tryent G Sept. 9, 2026, 9:42 a.m. OK C++23 (GCC 14-64, msys2) TESTS 19 93 7270400
389959707 Suryansh129 G Sept. 8, 2026, 5:21 p.m. OK C++23 (GCC 14-64, msys2) TESTS 19 109 7270400
390076538 liaoyanxu G Sept. 9, 2026, 12:56 p.m. OK C++23 (GCC 14-64, msys2) TESTS 19 109 13516800
389977550 Mangooste G Sept. 8, 2026, 9:46 p.m. OK C++23 (GCC 14-64, msys2) TESTS 19 140 1740800
389977535 Mangooste G Sept. 8, 2026, 9:45 p.m. OK C++23 (GCC 14-64, msys2) TESTS 19 156 1740800
389979227 moonhero G Sept. 8, 2026, 10:46 p.m. OK C++23 (GCC 14-64, msys2) TESTS 19 218 16076800
390127372 Maquia G Sept. 9, 2026, 5:11 p.m. OK FPC TESTS 19 78 1843200
389976175 KAVTHI3125 G Sept. 8, 2026, 9:10 p.m. OK Go TESTS 19 5875 862412800
390133501 Yashwanth_reddy124 G Sept. 9, 2026, 5:57 p.m. OK Java 21 TESTS 19 2281 292556800
390141362 varshaps5610 G Sept. 9, 2026, 7:28 p.m. OK Java 21 TESTS 19 2421 286412800
390065466 RITHIKA28 G Sept. 9, 2026, 11:07 a.m. OK Java 21 TESTS 19 2687 324403200
390148621 updeshsingh010 G Sept. 9, 2026, 10:21 p.m. OK Java 21 TESTS 19 2796 282931200
390072017 kembu G Sept. 9, 2026, 12:16 p.m. OK Java 8 TESTS 19 2703 89907200
390141008 venkateshaa04 G Sept. 9, 2026, 7:23 p.m. OK Java 8 TESTS 19 2734 266342400
389991660 BeforeRedemption G Sept. 9, 2026, 4:35 a.m. OK PyPy 3-64 TESTS 19 3593 398643200
390154647 ramumali2002 G Sept. 10, 2026, 2:07 a.m. OK PyPy 3-64 TESTS 19 3656 265011200
390064370 code.demon G Sept. 9, 2026, 10:54 a.m. OK Python 3 TESTS 19 7906 347852800
389995053 SamarthMishra_29 G Sept. 9, 2026, 5:38 a.m. OK Python 3 TESTS 19 8000 347852800

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