Codeforces Round 987 (Div. 2)

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ContestId
Name
Phase
Frozen
Duration (Seconds)
Relative Time
Start Time
2031 Codeforces Round 987 (Div. 2) FINISHED False 7200 44731523 Nov. 15, 2024, 12:35 p.m.

Problems

Solved
Index
Name
Type
Tags
Community Tag
Rating
( 449 ) F Penchick and Even Medians PROGRAMMING binary search constructive algorithms interactive

This is an interactive problem. Returning from a restful vacation on Australia's Gold Coast, Penchick forgot to bring home gifts for his pet duck Duong Canh! But perhaps a beautiful problem crafted through deep thought on the scenic beaches could be the perfect souvenir. There is a hidden permutation(^{\text{∗}}) (p) of length (n), where (n) is even. You are allowed to make the following query: Choose a subsequence(^{\text{†}}) of the permutation (p) with even length (4\le k\le n). The interactor will return the value of the two medians(^{\text{‡}}) in the chosen subsequence. Find the index of the two medians in permutation (p) using at most (80) queries. Note that the interactor is non-adaptive . This means that the permutation (p) is fixed at the beginning and will not change based on your queries. (^{\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{†}})A sequence (a) is a subsequence of a sequence (b) if (a) can be obtained from (b) by the deletion of several (possibly, zero or all) element from arbitrary positions. (^{\text{‡}})The two medians of an array (a) with even length (k) are defined as the (\frac{k}{2})-th and (\left(\frac{k}{2} + 1\right))-th smallest element in the array ((1)-indexed). Each test contains multiple test cases. The first line contains the number of test cases (t) ((1 \le t \le 1000)). The description of the test cases follows. The only line of each test case contains a single integer (n) ((6 \le n \le 100), (n) is even) — the length of the hidden permutation (p). For each test case, after reading the inte

Tutorials

Codeforces Round 987 (Div. 2) Editorial

Submissions

Submission Id
Author(s)
Index
Submitted
Verdict
Language
Test Set
Tests Passed
Time taken (ms)
Memory Consumed (bytes)
Tags
Rating
291735282 pengyantong F Nov. 16, 2024, 4:14 a.m. OK C++17 (GCC 7-32) TESTS 48 109 102400
291722202 bro_jie F Nov. 16, 2024, 12:58 a.m. OK C++17 (GCC 7-32) TESTS 48 140 102400
291732334 Peppa____Pig F Nov. 16, 2024, 3:34 a.m. OK C++17 (GCC 7-32) TESTS 48 156 4096000
291665797 Kilani F Nov. 15, 2024, 3:57 p.m. OK C++17 (GCC 7-32) TESTS 48 156 4096000
291730246 hahawang F Nov. 16, 2024, 3:06 a.m. OK C++17 (GCC 7-32) TESTS 48 171 102400
291686302 Chenly F Nov. 15, 2024, 5:47 p.m. OK C++17 (GCC 7-32) TESTS 48 171 102400
291673288 244mhq F Nov. 15, 2024, 4:35 p.m. OK C++17 (GCC 7-32) TESTS 48 171 102400
291682295 Mier_ F Nov. 15, 2024, 5:25 p.m. OK C++17 (GCC 7-32) TESTS 48 171 3276800
291708179 kartavyain2006 F Nov. 15, 2024, 8:38 p.m. OK C++17 (GCC 7-32) TESTS 48 186 102400
291689440 qwsin F Nov. 15, 2024, 6:03 p.m. OK C++17 (GCC 7-32) TESTS 48 186 102400
291723683 white_paperdog F Nov. 16, 2024, 1:15 a.m. OK C++20 (GCC 13-64) TESTS 48 109 4096000
291725954 2018LZY F Nov. 16, 2024, 1:57 a.m. OK C++20 (GCC 13-64) TESTS 48 124 0
291725900 2018liuzhiyuan F Nov. 16, 2024, 1:56 a.m. OK C++20 (GCC 13-64) TESTS 48 124 0
291729624 kimoyami F Nov. 16, 2024, 2:57 a.m. OK C++20 (GCC 13-64) TESTS 48 124 102400
291724603 0x0002 F Nov. 16, 2024, 1:33 a.m. OK C++20 (GCC 13-64) TESTS 48 124 102400
291709607 Michael533 F Nov. 15, 2024, 8:54 p.m. OK C++20 (GCC 13-64) TESTS 48 124 102400
291703581 mychecksdead F Nov. 15, 2024, 7:52 p.m. OK C++20 (GCC 13-64) TESTS 48 124 102400
291662493 ShanMaitzzzz F Nov. 15, 2024, 3:42 p.m. OK C++20 (GCC 13-64) TESTS 48 124 102400
291744572 gdf_yhm F Nov. 16, 2024, 5:59 a.m. OK C++20 (GCC 13-64) TESTS 48 124 3276800
291708034 egge F Nov. 15, 2024, 8:37 p.m. OK C++20 (GCC 13-64) TESTS 48 139 102400
291735380 tzl_Dedicatus545 F Nov. 16, 2024, 4:15 a.m. OK C++23 (GCC 14-64, msys2) TESTS 48 124 102400
291734710 binminh01 F Nov. 16, 2024, 4:06 a.m. OK C++23 (GCC 14-64, msys2) TESTS 48 124 102400
291723454 Pashechka F Nov. 16, 2024, 1:10 a.m. OK C++23 (GCC 14-64, msys2) TESTS 48 124 102400
291669317 Pemguimn F Nov. 15, 2024, 4:16 p.m. OK C++23 (GCC 14-64, msys2) TESTS 48 124 102400
291663551 Wael_Zaiback F Nov. 15, 2024, 3:46 p.m. OK C++23 (GCC 14-64, msys2) TESTS 48 124 102400
291723757 Pashechka F Nov. 16, 2024, 1:16 a.m. OK C++23 (GCC 14-64, msys2) TESTS 48 140 102400
291723398 Qzong F Nov. 16, 2024, 1:09 a.m. OK C++23 (GCC 14-64, msys2) TESTS 48 155 102400
291683949 tosivanmak F Nov. 15, 2024, 5:35 p.m. OK C++23 (GCC 14-64, msys2) TESTS 48 155 102400
291655678 Farhod F Nov. 15, 2024, 2:32 p.m. OK C++23 (GCC 14-64, msys2) TESTS 48 155 512000
291688782 Iceberg F Nov. 15, 2024, 6 p.m. OK C++23 (GCC 14-64, msys2) TESTS 48 171 102400
291731634 golions F Nov. 16, 2024, 3:25 a.m. OK Java 8 TESTS 48 749 102400
291665706 VitalyKo F Nov. 15, 2024, 3:56 p.m. OK PyPy 3 TESTS 48 812 10444800
291712327 Jrke F Nov. 15, 2024, 9:28 p.m. OK PyPy 3-64 TESTS 48 468 7475200
291718975 xxx.ego F Nov. 15, 2024, 11:29 p.m. OK PyPy 3-64 TESTS 48 530 9318400

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