codeforces round 764 div 3

Perl: 142302044. Solution to Problem C using "Max Flow" :)142222070Resource For Dinic's algorithm. 2) we can always choose the store that has the highest second max, and pick the max and second max gifts from this store and give them for the respective friends (lets call this decision opt*), and I argue this choice can always be made and still achieve an optimal solution: if our solution has 2 other items from any same store, then the second highest of these two will be smaller than the second highest of the opt* choice (by definition of highest second max), making it a worse choice. AC. 3) Interesting Facts. (That means J's contribution is also the biggest if it's for I.). 2), [GYM] The 2023 Damascus University Collegiate Programming Contest, Codeforces Round 888 (Div. Otherwise, $$$ans_i = ans_{i-1}$$$. If you've seen these problems, a virtual contest is not for you - solve these problems in the archive. What is the answer for a fixed $$$x$$$, $$$y$$$, $$$s$$$? Remember that only the trusted participants of the third division will be included in the official standings table. Alternate Solution for 1787-G (Colorful Tree Again), https://www.youtube.com/watch?v=W-y8gQFrFOY, https://www.youtube.com/watch?v=6k8YudeK_04, https://codeforces.com/contest/1624/submission/142294335, https://codeforces.com/contest/1624/submission/142288442, https://codeforces.com/contest/1624/submission/142284695, https://codeforces.com/blog/entry/8790?#comment-876676, take part in at least five rated rounds (and solve at least one problem in each of them). pathetique amogus . My O(30 * M) code got accepted. 25 , . Codeforces Round #764 (Div. UPD: Got it. 2) 1:57:59 CodeforcesEducational Codeforces Round 121 (Rated for Div. Note that the interactor is not responsive. The format of the event will be identical to Div. Codeforces Round 764 (Div-3) Solutions || All problems A-G To make a hack, use the following format: a single line must contain two numbers $$$x$$$ and $$$n$$$, separated by a space. Problem - F - Codeforces Also notice that if $$$f_{i-1} \geq 2$$$, we must set $$$lst$$$ to $$$i-1$$$, due to it's definition. 2)A-ECodeforces Round #804 (Div. As it is written by link, this is a compulsory measure for combating unsporting behavior. Note that none or one of them can be assigned to their best shop. Finish Solution to problem D without binary search :-, Edit: I don't have any proof, but it works. 1, Div. is applied. You now have the graph. 1 + Div. Harbour.Space University! , Codeforces! Problem E can be solved in linear time (without sorting mentioned in the editorial): Lets create a list $$$f$$$, where $$$f_v$$$ is the amount of times $$$v$$$ occurs in the input $$$a$$$. You will be offered 7-8 problems with expected difficulties to compose an interesting competiti I solve B using inclusion and exclusion principle. (doubles how many pairs of letters there are, singles number of letters minus doubles * 2). Actually my solution to that problems is O(n * m * n). 1850A - To My Critics. Codeforces Round #764 (Div. We need to create $$$[2, 3, 4]$$$ from $$$[1, 6, 8]$$$. k30an0, Bb. Problem - 1624B - Codeforces Case 2: Otherwise. hack3 1 4 1 8 3 q(1) 1 3 8 3 4 81 4 8 keepPeace: . Hello! For example, in C++ you should use the function fflush(stdout), in Java System.out.flush(), in Pascal flush(output) and in Python sys.stdout.flush(). Codeforces Round #764 (Div. 3) Editorial - Codeforces Case 1: Number of different "optimal" shops (i.e. #define lb lower_bound $n$ $1$ , $n$ $x$ $\lfloor \dfrac x 2 \rfloor$ $1 \sim n$ , $[1, n]$ $n$ $[1, n]$ , $1$ $\lfloor \dfrac x 2 \rfloor$ , $n$ $k$ $1$ , , $n$ $m$ $s$ $m$ $s$ $2$ $n$ Groups; Rating; Edu; API; Calendar; Help . For example, pow(10^9, 1/3) = 999.9999 and not 1000 as it should be. Virtual contest is a way to take part in past contest, as close as possible to participation on time. https://codeforces.com/contest/1624/submission/142284695. Plus One on the Subset You will be offered 7-8 problems with expected difficulties to compose an interesting competition for participants with ratings up to 1600. Alternate Solution for 1787-G (Colorful Tree Again). Ratings haven't been updated yet. Can someone explain this part from Problem G ? Codeforces Round 887 (Div. Now look at its connected components. Firstly, notice that $$$ans_i$$$ for $$$i \leq mex(a)$$$ is simply $$$f_i$$$, because we only need to increment the values occupying our target MEX. num2 3) Editorial. session: HttpSession = request.getSession(); Make AP 1 abcmabca * mbcab * mcabc * m 2 abbcacd dYES acd 3) Make AP , A. 2100. [Codeforces] Round 764 (Div. 3) G. MinOr Tree | SUMFIBlog 3<=k<=1e9, f1=af2=b, f3= a + b, f4=a + 2b, f5 = 2a + 3b..a[i]fiab[i] fi b . 3) A. presuflrlpalindromerpalindromepre+palindrome+suf that is can we repeat a particular segment? Again! By mesanu , history , 11 minutes ago , Thank you for participating! CodeforcesCodeforces Round #796 (Div. 1)__bilibili my code. [Codeforces] Round 766 (Div. You should consider the situation that (num2 Call an array b b of n n integers imbalanced if it satisfies the following: for each 1 i n 1 i n, there are exactly ai a i indices j j ( 1 j n 1 j n) such that bi +bj > 0 b i + b j > 0, where i i and j j are not necessarily distinct. I kept on thinking about issues with the logic when my solution was actually asking for an extra query than needed. , 1.1:1 2.VIP, cf~~A. The only programming contests Web 2.0 platform, Codeforces Round 887 (Div 1, Div 2) Tutorial, [GYM] HIAST Collegiate Programming Contest 2023, Codeforces Round #884 (Div. This divided and then multiplied by k (integer division) will give the number of pairs that will be assigned to each color. E. Masha-forgetful E 2. We can represent those circles with treaps, one for each circle, when the nodes are i, p[i], p[p[i]], from left to right. 1 + Div. Codeforces Round #764 (Div. n+1+1 Codeforces Round #818 (Div. They have an array of positive integers a of size n. Before starting the game, Alice chooses an integer k 0. Came up with treap solution as my first approach and became unable to think of the $$$O((N+Q)\sqrt{N})$$$ one :(. Never use someone else's code, read the tutorials or communicate with other person during a virtual contest. session.getAttribute("name"); //null, ITestListener Nice idea. Nice explanation. 140296294. Pay attention Before contest CodeTON Round 4 (Div. Codeforces Round #764 (Div. 3) Editorial - Codeforces setaaa[52],a[i]setaaa; Indeed, it's quite reminiscent of this problem from SecondThread's treap educational contest. This ensures that we can increment $$$1$$$ or more values of size $$$lst$$$ to assist in reaching the target MEX. ICPC. Then there has to be at least one person $$$i$$$ such that it's not assigned to $$$B_i$$$. (''), Xuhx&: Before contest Codeforces Round 886 (Div. I turned into a zombie after solving 2 problems. MintSubmission #170619238 - Codeforces. d uality Codeforces Round #884 (Div. I am not able to understand the meaning of this message and also not able to find the bug in my code. I tried solving a few interactive problems but got the idle limit exceeded! In the photo are all of these guys also the setters of this round or just for answering the question asked by everyone? Got a binary search solution for F, but it gets W/A on 6th test. 2) Editorial . If you've seen these problems, a virtual contest is not for you - solve these problems in the archive. mesanu, flamestorm and I are very excited to invite you to Codeforces Round 886 (Div. Could we please have div3 rounds on the weekends? Codeforces Round #764 (Div. 3) - cherish-lgb - / set Note that both Alice's move and Bob's move are two parts of the same stage of the game. I saw that he complained too here https://codeforces.com/blog/entry/8790?#comment-876676. lool, did you even read whatever you pasted? ) is some funny inside joke that I'm not in on. Your code gets accepted(1900ms) if you start with 29th bit. makes me wonder if there are any downsides to always using long long instead of int, I couldn't see any time difference with $$$2.10^9$$$ operations. After that, if the array is not empty, Bob must add $$$k - i + 1$$$ to an arbitrary element of the array. Note that the penalty for the wrong submission in this round is 10 minutes. https://codeforces.com/contest/1619/submission/140109705, podtelkin could you please explain why this idea worked? It's probably 'Interac-div-e' where 'div' stands for the division operation. Codeforces Clean Code Champions: Nominate Your Favorites! Trying to solve an old Topcoder TCO06 problem, Invitation to Codeforces Round 887 (Div. Sorry for trying to point out anything, and moreover, sorry for not leading your example in making a shitty argument towards a possible point to assert my dominance over.. whatever. I am happy and only I know how happy I am. 2), [GYM] The 2023 Damascus University Collegiate Programming Contest, Codeforces Round 888 (Div. Can anyone explain mistate or send a test that fails https://codeforces.com/contest/1624/submission/142288442 Thanks! System.out.println(m.getInstance().toString().split("@")[0] + "-" + m.getMethodName()); The game lasts for k stages, the stages are numbered from 1 to k. During the i -th stage, Alice must remove an element from the array that is less than or equal to k i + 1. I would appreciate a lot. I haven't seen them for a year. I guess too many successful hacks. I think I have an O(n + qlogn) solution for problem H: A permutation is a composition of circles (i -> p[i] -> -> i). 1624A - Plus One on the Subset. MikeMirzayanov Polygon Codeforces. I felt crippled at binary search in F :)), F made me realise that if my usual binary search implementation isn't suitable for the problem, then I am screwed :), This round is amazing! . List of testers will be updated. 3) 2:18:30 CodeforcesCodeforces Round #765 (Div. When upsolving G with an unordered_map I got TLE for problem G. When using a map it passes. 2) A~E. It is supported only ICPC mode for virtual contests. , . 3) TMDdiv3..! n3 2 o(n^2) o(n) vector 0n+1 d 1nL,Rd R . the rest sigma(freq[i]/2) pairs of characters can be splitted evenly between each of the k palindromes. Codeforces Round #764 (Div. 3) - Codeforces I'am gray. Call it $$$V_s$$$ and $$$C_s$$$ for shop $$$s$$$ respectively. We can simply take the best shop for each remaining friend. Apparently, the main idea for the problem was the same as one of the ideas used in one of the problems in yesterday's Codechef Snackdown Finals. for (ITestNGMethod m : methods) { Hello Codeforces! So, yeah, I do admit that I was rude, but probably I didn't offend the work of some people that spanned maybe weeks or months, and only some careless person. D2. Problems have been created and written by ITMO University team: MikeMirzayanov, MisterGu, myav, Gol_D, Aris, DmitriyOwlet and Vladosiya. #define rep(i,a,b) for(int i=a;i=b;i--) K-SET 3) Finished: Virtual participation . 3) will start at Jan/10/2022 17:35 (Moscow time). Was problem G taken from somehwere? 3) will start at Saturday, April 29, 2023 at 07:35 UTC-7. }, https://blog.csdn.net/m0_51508220/article/details/122436068, 2 ^ 30 00 1.res. Codeforces Round #764 (Div. 3) - UPD-> Got it, read the announcement now:). 3) G. MinOr Tree. My algorithm complexity would timed out. Jun/29/2023 17:35 (Moscow time) Educational Codeforces Round 151 (Rated for Div. 2), : ' Firebase.\n- _' -> ' Firebase._\n- _', Initial revision for English translation (saved to drafts). So, in the original testcase, the jury thinks that you're going to print $$$L$$$ segments, while you actually intended to print just one. The line which has a little mistake: if(x < y && y >= 10 && y <= 19) b.emplace_back(y x); Replace the line with this line: if(x < y && y >= 10 && y <= 18) b.emplace_back(y x); The only programming contests Web 2.0 platform, Codeforces Round 887 (Div 1, Div 2) Tutorial, [GYM] HIAST Collegiate Programming Contest 2023, Codeforces Round #884 (Div. If so, damn, he should get a patent for "behaviour". System.out.println(m.getInstance().toString().split("@")[0] + "-" + m.getMethodName()); Count occurences of letters in original string and count number of singles and doubles. Intuition Behind Codeforces Round #764 (Div. 3) - Codeforces -set-map 7KIRA1999 N points, dist btw two points is defined as min (abs (x1-x2), abs (y1-y2)).find kth min dist. 3 rounds: 5-8 tasks; ICPC rules with a penalty of 10 . This is my submission for problem E 142402622. A type 2 query "2 i k" is equivalent to, (say vertex i is on cycle[i]) find the (k mod length(cycle[i]))-st neighbor of i on cycle[i]. cf 2,3 2,3DP A. EhAb AnD gCd 2) Editorial. 1 + Div. In problem C's code it should be 18 instead of 19. if(x < y && y >= 10 && y <= 19) b.emplace_back(y x); I saw some solutions for problem H that use link cut tree, could anyone help me to understand the idea behind these solutions? #define pb push_back A type 1 query "1 x y" is equivalent to cut cycle(s) at the edge (x -> p[x]) and the edge (y -> p[y]), and join the broken cycle(s) with new edges (x -> p[y]) and (y -> p[x]). $$$B_i$$$ means the best shop to choose while buying a gift for person $$$i$$$. I get why my algorithm is fake. was wondering why I was retarded for the past hour lol. Can you help me rectify error in this comment, i have described a similar idea but i can't make sense of downvotes. 2) Editorial. This video aims to explain not only the solutions to the recent div3 problems, but also the intuition I used to get to them!0:00 Introduction0:40 A3:15 B6:22. setlower_boundupper_bound I think one simple way of explaining this approach is: 1) we have to pick at least two gifts from the same store (by the pidgeonhole principle). 140270271 Can you take a look at this submission of G, please? couldn't get AC on E because of integer overflow. According to the description of the problem, you can easily get the follow inequality: I use a[i][j] to describe the j's contribution to friends numbered i. Codeforces Round #764 (Div. 3) E(dp)G() - - Codeforces Clean Code Champions: Nominate Your Favorites! 2).. Harbour.Space University! Harbour.Space University Codeforces . For example, a_i=25 and n=5, then the set is {1,3}. as always, here are the solutions to problems A, B, C, D, E, F and G of Codeforces Round 764 (Div-3) If you are interested in attending free classes based on competitive program. If the $$$k$$$-th stage ends and Alice hasn't lost yet, she wins. C. Number Game. I just thought of putting all the occurances of each letter into a set , & do the process optimally for k times , can someone help me, I know my solution will fail at cases like aaaaaaa, k = 2.. : if (freq[i]%2==1) // one of the occurrences of this character can be part of a palindrome at the middle position. 2.2 2022 CodeforcesHello 2022 2:06:03 CodeforcesCodeforces Round #764 (Div. Here is a way to check it: We can store for every shop the value of its most valuable gift and its count. Pay attention Before contest Codeforces Round #764 (Div. According to me, the order could be A B C F E D. Why need to sort the input array of problem E? For the general problem, use a map> mapx, mapy; or something like that to store bombs on the same x-straight line or y-straight line and solve it as if all bombs are on the straight line. If someday there will be an super-algorithm to solve all problems, everyone will be using that ! }, : However, this one didn't affect my rating at all. And you can find that at least two friends will have their favorite gifts in the same shop, so the maxTop2ByShops[j] won't less than minTop1ByFriends[i]. Codeforces Round #764 (Div. Codeforces Round #764 (Div. 3) A B C D E G - CSDN MikeMirzayanov my submission 142240970 coincides with 142233988 from bernardo_amorim, after looking at his code I think it was triggered because of the main, he have a similar style to mine and this problem is a classical 15 lines problem, I do not know this guy and I did not cheat in any way!!. I got the idea of query of type 2, but not of type1, why we need inverse indices and that part. 4) Editorial. I got wrong answer "wrong answer Jury has answer, but participant doesn't" in Problem E. I use greedy and kmp algorithm. Codeforces Round #764 (Div. 3) A. Plus One on the Subset - CSDN Let's introduce a pointer $$$lst$$$, which, during our evaluation of MEXes, will always point to the first index less than the target MEX such that $$$f_{lst} \geq 2$$$. We already have $$$[3, 4, 5, 6, 7]$$$. 3) Interesting Facts. Thanks to MikeMirzayanov for the platform, help with ideas for problems and for coordination of our work. it's easier than D and E. look at this submission, Only after you realize it/read the editorial :), D/E are like just do whatever said, F needs a lil bit of thinking. The first line of each test case contains a single integer $$$n$$$ ($$$1 \le n \le 100$$$) the size of the array $$$a$$$. A.. session.getAttribute("name"); //null, Xuhx&: But is this algorithm is wrong? Thus, solutions will be judged on preliminary tests during the round, and after the round, it will be a 12-hour phase of open hacks. https://www.youtube.com/watch?v=0SbJnUiSD9E&ab_channel=Harisamsharma. But we have to find a way to ensure that there is at least one $$$y$$$ such that $$$p_{sx} \leq p_{sy}$$$ holds for a fixed $$$x$$$, $$$s$$$. You can just keep an assert statement which will give you a runtime error if you exceed the query limit. If $$$p_{sx} < V_s$$$ or $$$p_{sx} = V_s$$$ and $$$C_s \geq 2$$$ then it is a valid $$$(x, s)$$$ pair. 12 , ( ). Sort the bombs, add an edge between all pairs of consecutive bombs with distance $$$\leq K$$$. Participant asked to add: 2, x has now become: 5, Participant asked to add: 4, x has now become: 9, Participant has guessed the current x as: 10. To make a query, print on a separate line: Print the answer, like the queries, on a separate line. One obvious choice is the splay tree. -set For example, consider this testcase. Codeforces Round 863 (Div. 3) D~E - -