Atto Round 1 (Codeforces Round 1041, Div. 1 + Div. 2)

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ContestId
Name
Phase
Frozen
Duration (Seconds)
Relative Time
Start Time
2127 Atto Round 1 (Codeforces Round 1041, Div. 1 + Div. 2) FINISHED False 10800 21828323 Aug. 7, 2025, 2:35 p.m.

Problems

Solved
Index
Name
Type
Tags
Community Tag
Rating
( 104 ) G2 Inter Active (Hard Version) PROGRAMMING binary search bitmasks constructive algorithms graphs implementation interactive math probabilities

This is the hard version of the problem. The difference between the versions is that in this version, you can make at most (10\cdot n) queries. You can hack only if you solved all versions of this problem. Ali loved Bahamin's gift (from problem E) so much that he illegally traveled from Qazvin to Liverpool to have the gift signed by football players. Now Interpol is searching for him, but they've offered a deal: solve a problem, and he can stay in Liverpool. But since he's currently at the stadium, he can't solve it — so he asked you to do it. This is an interactive problem. There is a hidden permutation(^{\text{∗}}) (p) of length (n\ge 4), where (p_i \neq i) for each (1 \leq i \leq n). Initially, you should give the jury a positive integer (k\le n), which will be constant through future queries. Then you need to find permutation (p) using some queries. In each query, you give a permutation (q_1, q_2, \ldots, q_n) to the jury. In response, you will receive the number of pairs ((i, j)) such that all of the following conditions hold: (i \lt j); (p_{q_i} = q_j); (i \neq k). ((k) is the constant you have given to the jury) You are given (n), and you need to find the permutation (p) in at most (10\cdot n) 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). Each test contains multiple test cases. The first line contains the number of test cases (t) ((1 \le t \le 500)). The description of the test cases follows. The only line of each test case contains a single integer (n) ((4 \leq n \leq 100)) — the length of (p). It is guaranteed that the sum of (n^2) over a

Tutorials

Atto Round 1 (Codeforces Round 1041, Div. 1 + Div. 2) Editorial

Submissions

Submission Id
Author(s)
Index
Submitted
Verdict
Language
Test Set
Tests Passed
Time taken (ms)
Memory Consumed (bytes)
Tags
Rating
332918725 tourist G2 Aug. 7, 2025, 7:11 p.m. OK C++20 (GCC 13-64) TESTS 100 140 102400
332931844 EJIC_B_KEDAX G2 Aug. 7, 2025, 10:49 p.m. OK C++20 (GCC 13-64) TESTS 100 171 102400
332918772 vedantkohad G2 Aug. 7, 2025, 7:12 p.m. OK C++20 (GCC 13-64) TESTS 100 421 102400
332934433 zhongjunwei G2 Aug. 8, 2025, 12:14 a.m. OK C++23 (GCC 14-64, msys2) TESTS 100 108 102400
332922700 iitamansharma G2 Aug. 7, 2025, 7:53 p.m. OK C++23 (GCC 14-64, msys2) TESTS 100 124 102400
332899962 jiangly G2 Aug. 7, 2025, 5:18 p.m. OK C++23 (GCC 14-64, msys2) TESTS 100 156 102400
332919934 Mahammad_12 G2 Aug. 7, 2025, 7:23 p.m. OK C++23 (GCC 14-64, msys2) TESTS 100 358 102400
332903267 ksun48 G2 Aug. 7, 2025, 5:26 p.m. OK C++23 (GCC 14-64, msys2) TESTS 100 405 102400
332916470 rainboy G2 Aug. 7, 2025, 6:52 p.m. OK GNU C11 TESTS 100 468 8396800
332907057 conqueror_of_tourist G2 Aug. 7, 2025, 5:34 p.m. OK PyPy 3-64 TESTS 100 952 10649600

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