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Общий форумandreyDagger WA15 // Задача 1578. Охота на мамонта 11 июн 2022 17:40 I had X[2000], then I changed it to X[2002] and got AC georg I got accepted with a wrong program // Задача 2143. Victoria! 10 июн 2022 15:47 Test: 99 10 ***|_|*** .*.|_|*** *.*|_|*** ***|_|*** .*.|_|*** *.*|_|*** and so on (block of 3 rows repeated 33 times). My program hangs out on this test (takes infinite time), but I got accepted. andreyDagger Strange approach [1] // Задача 1483. Настольный футбол 25 фев 2022 22:50 It's obvious that answer for first team is n - 1 How to get answer for second team. Of course total number of points do not exceed 3 * (n * (n - 1) / 2), because we played n * (n - 1) / 2 matches, and in every match summary points not exceed 3. Assume looser team got k points, that mean that total number of points >= k * n. But k * n can't be greater than 3 * n * (n - 1) / 2, so: k * n <= 3 * n * (n - 1) / 2, then k <= 3 * (n - 1) / 2. Answer is 3 * (n - 1) / 2. Apkawa Re: Strange approach // Задача 1483. Настольный футбол 8 июн 2022 21:18 But how to prove that we can make such competition where k is the smallest value and we have (n - 1) values that are not less? Edited by author 08.06.2022 21:21 Unsocial_A explain the logic behind this problem [2] // Задача 1023. Пуговицы 20 сен 2018 23:44 I have seen many people solve this problem using divisor of given number(k).But i cannot understand how it works.Can anyone explain me how this logic works?? sorry for bad english PO Re: explain the logic behind this problem // Задача 1023. Пуговицы 18 янв 2019 12:58 you need to be in control. you are in control when you keep the first player in "loop". if you take number of buttons is 6, say, then the "loop" length is 3, i.e. if you take max number of buttons as 3 - 1 = 2, then whatever amount the first player takes you can keep them in loop. if they take first time 1, you take 2 - in sum 3, 3 - remaining, you are a winner. if they take 2 - you take 1, 3 remaining again - you are a winner. so, idea is to find the smallest divisor of a number > 2 & answer will be that - 1. hope that makes sense. Edited by author 18.01.2019 19:50 topcoderme123 Re: explain the logic behind this problem // Задача 1023. Пуговицы 7 июн 2022 10:19 WLOG, let's break `k` elements of heap into block of length `d`. The numbers below are listed from 1, ..., k in their congruent modulo of `d`. [1, 2, ...., (d - 1), d], [1, 2, ...., (d - 1), d], ......(k / d) blocks. Here [..] is a block notation. B = #blocks of length `d` = (k / d) Basis: If B = 1, it's always true, as `first player` can pick whatever from 1, ..., (d - 1), `second player` always left with atleast 1 element by less then d to be picked. So `second player` player will greedily pick all remaining element in the block as an optimal move for his/her winning. Hypothesis: Let say it's true upto (B - 1) blocks that `second player` has taken the last element. Proof: If we have B block then since it is true for (B - 1) blocks we left with 1 block of element to pick and since `first player` is the who pick first in the last 1 block by using the `basis` we know that `second player` is always the winner. Hence, if we take the divisor of number of elements in the heap (k) we always end of with `second player` being the winner. Edited by author 07.06.2022 10:23 Edited by author 07.06.2022 10:23 andreyDagger WA18 hint // Задача 1498. Удар с разбега 6 июн 2022 19:30 Knight can't step on the cell with the horned demon Grandmaster Sokoban visualizer // Задача 1589. Сокобан 6 июн 2022 01:52 https://soucupb.github.io/Sokoban-Solver/ I will leave this here. It is a visualizer to test your solution. Maybe somebody will find this useful. D4nick It will make test for you // Задача 1846. НОД 2010 5 июн 2022 23:20 int make_test() { fstream inp("input2.txt", ios::out | ios::binary | ios::in | ios::trunc); if (!inp) { _Post_equals_last_error_ DWORD er = GetLastError(); cerr << er << '\n'; _getch(); exit(1); } int n = 100; inp << n << '\n'; srand(time(0)); for (int i = 0; i < n; i++) { int sign = rand() % 2; if (sign == 1 || i < 2) { int a = rand() % 300; while (find(simple.begin(), simple.end(), a) != simple.end()) { a = rand() % 300; } inp << "+ " << a << '\n'; v.push_back(a); } else if (v.size() > 1) { int a = rand() % v.size(); inp << "- " << v[a] << '\n'; v.erase(v.begin() + a); } } inp.close(); return 0; } ₰ҟᾷѓßὂνṑγ (ONPU) For reading input in c# // Задача 1006. Квадратные рамки 5 июн 2022 14:12 ... TextReader reader = new StreamReader(Console.OpenStandardInput(), System.Text.Encoding.GetEncoding("iso-8859-1")); ... string line = reader.ReadLine(); ... roman velichkin Could you explain some moments in this problem? // Задача 1650. Миллиардеры 1 июн 2022 13:12 Is there possible such test: 1 A aa 10 1 1 1 A bb ? If then, what correct solution will be: 'aa 1' or 'aa 1, bb 1'? k - is it a day when person comes to city? Or it is a day when he goes to that city - so person comes in this city on next day? Why in example 25 days, but result has only 20 days? If two cities have same largest amount of money then it shouldn't be counted? Edited by author 02.06.2022 13:52 Hao123 wa#2?? what mean this?? [1] // Задача 1835. Болотный доктор 23 окт 2014 02:34 Why always i get wrong answer in test#2?? which is the case i didnt condiser?? in the case>> aa@ab.c aa@as.a aa@abs.l my code return "7" Edited by author 23.10.2014 02:42 Edited by author 23.10.2014 02:43 yyll Re: wa#2?? what mean this?? // Задача 1835. Болотный доктор 1 июн 2022 10:56 ab@ab@ab 4 aa@ab.c aa@as.a aa@abs.l 14 Rudo WA test#7 // Задача 1242. Оборотень 31 май 2022 02:24 Have no idea what's wrong I used simple plan with massive of relations and recursive function that checks all ancesters (only up moving) and all descendants (only down moving). There is some part of code in C++: int checkforblood(int index, int** mas, int* checkmas, int range, int direct) { if (checkmas[index - 1] == 1) return 0; checkmas[index-1] = 1; for (int i = 0; i < range; i++) { if (( mas[i][0] == index )&&(direct > -1)) { checkforblood(mas[i][1], mas, checkmas, range, 1); } if (( mas[i][1] == index ) && (direct < 1)) { checkforblood(mas[i][0], mas, checkmas, range, -1); } } return 0; } I can't see the problem, so if you can't too i will know, that problem in output method. Edited by author 31.05.2022 02:26 Daria WA#5 help! [1] // Задача 1078. Отрезки 11 дек 2016 02:18 Does somebody know what test I need to try to solve this problem? Name-must-be-given-in-English Re: WA#5 help! // Задача 1078. Отрезки 30 май 2022 16:14 Same problem here. .-." Bergus python 3.6 hint [1] // Задача 1100. Таблица результатов 18 июн 2019 17:31 limit the number of conversions str->int roman velichkin Re: python 3.6 hint // Задача 1100. Таблица результатов 30 май 2022 08:50 It helped, thank you! lijian WA #13 [1] // Задача 1577. Электронная почта 20 окт 2007 08:03 please give some test data!! Edited by author 20.10.2007 08:04 Pavel Re: WA #13 // Задача 1577. Электронная почта 30 май 2022 04:00 Mind mod, I had 10^7+7 and it was failing yyll rounding in python is easy // Задача 1300. Налогообложение 28 май 2022 13:02 You can just do calculations with floats as much as possible, e.g., 15% = 0.15, binary search with epsilon = 0.0001. Rounding with round(x, 2) are needed only when: 1. K*L 2. output of T(K) -- "The calculation of the regional coefficient and all kinds the taxes is made with rounding off to two digits after a decimal point." while K itself is float. yyll very short, but MLE/TLE python solution // Задача 1863. Мирный атом 28 май 2022 09:37 n, s, k = map(int, input().split()) a = 1 << s for u in map(int, input().split()): a = a >> u | (a & (1 << n+1-u) - 1) << u print((a & -a).bit_length() - 1, a.bit_length() - 1) khodezatuk kobra compiler problem // Задача 1083. Факториалы!!! 27 май 2022 20:45 #include<bits/stdc++.h> using namespace std; int solve(int n, string k){ int ans=k.size(); if(n>=1){ return n*solve(n-ans); } else{ return 1; } } int main() { int t,n; string k; cin>>n; cin>>k; int result=solve(n,k); cout<<result<<endl; return 0; } DrDynamic Wrong answer Test 2 // Задача 1788. О пользе зонтов 27 май 2022 18:08 Please, give me test Iosif inf-10 (Test № 4 here) [5] // Задача 1613. Для любителей статистики 8 фев 2013 04:05 This is Test 4 11 1 2 2 1 1 1 2 2 1 2 1 11 1 1 3 1 4 1 2 8 1 10 11 1 1 3 1 2 3 1 3 7 2 4 6 2 5 9 2 11 11 2 10 11 2 Answer is 01111010101 Edited by author 08.02.2013 04:06 Olya Re: (Test № 4 here) // Задача 1613. Для любителей статистики 25 дек 2014 01:37 no its not LLL Re: (Test № 4 here) // Задача 1613. Для любителей статистики 19 окт 2016 08:17 Thx TooTiredOne Re: (Test № 4 here) // Задача 1613. Для любителей статистики 21 июн 2018 23:00 Thanks! imaginary friend Re: (Test № 4 here) // Задача 1613. Для любителей статистики 14 авг 2018 03:10 thx roman velichkin Re: (Test № 4 here) // Задача 1613. Для любителей статистики 27 май 2022 08:41 It helped Alexey Damn, I cann't solve it! [6] // Задача 1302. Дельта-волна 2 июн 2006 17:08 Please, tell me how to solve this problem... Not solution but an idea or a hint... Thanks. Samsonov Alex [USU] Re: Damn, I cann't solve it! [5] // Задача 1302. Дельта-волна 2 июн 2006 19:58 You just have to understand the optimal algorithm for finding a shortest way from A to B on this object. Alexey Re: Damn, I cann't solve it! [4] // Задача 1302. Дельта-волна 2 июн 2006 20:31 I'm trying... Should I write a Function(n) wich returns the number of row in wich n shands? There is three kinds of "rows", so, what shall I do? Give me the way to think... Burunduk1 Re: Damn, I cann't solve it! [3] // Задача 1302. Дельта-волна 2 июн 2006 22:30 Find optimal path from 1 to some small numbers. It will help you. Try to change direction in the optimal path as few times as possible. Alexey Re: Damn, I cann't solve it! [2] // Задача 1302. Дельта-волна 3 июн 2006 16:34 It must be formula, isn't it? Or there is an algo to find answer? Denis Koshman Re: Damn, I cann't solve it! [1] // Задача 1302. Дельта-волна 25 июл 2008 20:00 There is a formula, but it's a bit easier to solve using algo. Convert input numbers into row/column. Row will not exceed ~33000, so you can iterate over row using algo and use math over column. Anton Beriugin Re: Damn, I cann't solve it! // Задача 1302. Дельта-волна 26 май 2022 17:45 Sorry, could you tell me the algorithm, otherwise I don’t understand it ...
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