Unhackable guide - Codeforces

#	User	Rating
1	tourist	3985
2	jiangly	3814
3	jqdai0815	3682
4	Benq	3529
5	orzdevinwang	3526
6	ksun48	3517
7	Radewoosh	3410
8	hos.lyric	3399
9	ecnerwala	3392
9	Um_nik	3392

#	User	Contrib.
1	cry	169
2	maomao90	162
2	Um_nik	162
4	atcoder_official	161
5	djm03178	158
6	-is-this-fft-	157
7	adamant	155
8	Dominater069	154
8	awoo	154
10	luogu_official	150

Last round involved a randomized solution for problem E, and some pretests were aimed against std's rand() function. Many participant's complained about doing tests against specific knowledge on language functions.

C++

Don't use rand

Careful with unordered_map

Java

Arrays.sort() may cause TLE!

Rev.	By	When	Δ	Comment
en10	eidan	2021-01-27 23:44:08	702
en9	eidan	2019-02-16 20:32:20	8
en8	eidan	2019-02-16 06:13:32	581	Tiny change: 'n instead.[More info' -> 'n instead. [More info'
en7	eidan	2019-02-15 10:36:54	298
en6	eidan	2019-02-15 10:20:34	176	Tiny change: 'n has low recursion limit">\n' -> 'n has low limit">\n'
en5	eidan	2019-02-15 06:30:43	228
en4	eidan	2019-02-15 00:22:49	878	Tiny change: ' a round. Since both side' -> ' a round. I think both side' (published)
en3	eidan	2019-02-14 23:10:00	2284	Tiny change: 'se <math>O<sup>2</sup></math>. [' -> 'se <math>O(n<sup>2</sup>)</math>. ['
en2	eidan	2019-02-14 20:28:05	1251
en1	eidan	2019-02-14 19:28:54	971	Initial revision (saved to drafts)

C++

Java

History