for i = 1 -> strlen(s) do Can anyone please help me understand editorial of prblm C in details with examples ? If mn[i] stores the index of the closest non-friend lying on the right of i, then to me mn[i] i is just the distance between the person i and it's closest non-friend to the right. Codeforces Round #837 (Div. 2) C. Hossam and Trainees. int r = i-l; For instance, $$$1 \oplus 2 \oplus 3 = 0$$$ but none of them occur an even number of times. https://codeforces.com/contest/1771/submission/184813975 2022/12/12 . DE SHAW OA (2023). 799A - Carrot Cakes. Codeforces Round #837 A~C_Showball.-CSDN can someone help me with Problem C? Contest rating: 1068 (max. } WA_: #define ll long long For the math behind collisions, Odd Mineral Resource (1479D)'s editorial is nice. So, we subtract the number of subsegments that are overlapping. } How do I set my home country on Codeforces? {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":".cph","path":".cph","contentType":"directory"},{"name":".vscode","path":".vscode . Then loop through 2 to n where the loop counter 'i' represents the right pointer of the subsegment. #include dpiji, 2) C. Hossam and Trainees, # [Codeforces Round #837 (Div. A. Hossam and Combinatorics. 0. std::ios::sync_with_stdio(false),cin.tie(0),cout.tie(0); B We need to find the smallest value $$$v$$$ such that this xor sum is nonzero. 2) A. Hossam and Combinatorics. Codeforces Round #103 (Div. int32_t main() PosPOS,pos Disclaimer: The above problem 1771B is generated by Codeforces but the solution is Provided by CodeYT. . We can assign each value a random hash from $$$[0, 2^{60})$$$ such that if $$$arr[i] < arr[j]$$$, $$$hash[arr[i]] < hash[arr[j]]$$$ and use much larger implicit segtrees. Love Song, /* Bhavik Agarwal (bhavik_2001) */ . In problem C, if we are calculating prime numbers $$$\le \sqrt{A}$$$, why isn't the time complexity $$$O(n\cdot\frac{\sqrt{A}}{\log{\sqrt{A}}})$$$? 1p1p 1, 0n+1 d 1nL,Rd R , vector22 , C2023726, switch if-else switch ifswitchif, x +x, C++CCextern "C", , stack list vectorqueuevectordeque, GDAL C++ API OGRGeometry OGRPoint, public OGRGeometry OGROpenGIS Simple Features Reference ImplementationOGR GIS Public FunctionsOGRPoint()OGRPoint(double x, double y) OGRPoint(double x, double y, d, s The only programming contests Web 2.0 platform. #include For each subsegment, if the vector is empty we continue and if the vector corresponding to is not empty and is an intersecting interval with the subsegment we first add the number of subsegments before including the right pointer. #include A pair of the $$$i$$$-th and $$$j$$$-th ($$$i \neq j$$$) trainees is called successful if there is an integer $$$x$$$ ($$$x \geq 2$$$), such that $$$x$$$ divides $$$a_i$$$, and $$$x$$$ divides $$$a_j$$$. https://en.wikipedia.org/wiki/Prime-counting_function The number of prime numbers less than n are of the order of n/log(n). VISITED. Never use someone else's code, read the tutorials or communicate with other person during a virtual contest. Binary search question. On some compiler " pragma GCC optimize("O3,unroll-loops") pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt") " Give error as I have previously asked a drought Spoj. set, if(s.find(s3)!=string::npos) You teach me One very useful thing. 1569B - Chess Tournament. What does it represent? I implemented that in Python (with pre-computed prime list and still got TLE for test case 3. Hossam has $$$n$$$ trainees. I tried to find a problem. 2), which will be held on May/06/2022 17:35 (Moscow time).. Our check function is checking if the xor of all the numbers in the range $$$arr[l \dots r]$$$ that are also $$$\leq v$$$ is nonzero. Participant's output 705032704 Jury's answer 5000000000 Checker comment wrong answer 1st numbers differ expected: '5000000000', found: '705032704', can anyone explain the idea for problem B, Well the last person has no more people in right, so no problem from him, the second last can only have problem with the last, but let say the person at index 2 has a problem with that of index 5 and that of index 3 has a problem with index 4, obviously the max you can go will be uptil 3 not 4, since if you get to 4 person at index 3 will have a problem. Also there are such things as pragmas. My solution do it. How do I set my home country on Codeforces? If you take a look at my previouscomment you will find that problem C accepted in pypy3 but TLE in pypy3 64bit .- The constraints of problem C is very tight even for c++ ,I saw many c++ solutions took above 2s to execute and maybe got TLE! Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. div187 All.java Anagram.java Anagrams.java Ananagrams.java AncientMessages.java Bacteria.java Base.java BeatTheSpread.java Bicycle.java Burger.java CD.java CS1.java CSI2.java CSI3.java CSI4.java CSI5.java CSR1.java CSR2.java We read every piece of feedback, and take your input very seriously. sorry i just find out i give a too small array for the edge,but still don't understand why it is mle but re, can somebody explain why int problem B it adds mn[i] i to the answer each time? { There was a problem preparing your codespace, please try again. 2], I think I just did something crazy? Codeforces Round #837 A~C. dp[n][m]011122223k Blog entries - Codeforces E you can use unordered_set. }else s+=r; Auto comment: topic has been updated by 4qqqq (previous revision, new revision, compare). C. Hossam and Trainees ( + ) WYW___ 2022-12-13 18:34:20 501 . We are so sorry for it. int r = n-l+1; He has n friends numbered from 1 to n. They will be arranged in a queue as follows: 1,2,3,,n. scary, and I don't think my implementation is particularly terrible, i tried improving it as well. My submission can be found here. All caught up! How to fight these types of questions with tight constraints? 21 { Round 889 Question B, Interactive Problems: Guide for Participants, Atcoder problem statement of F Cans and Openers, UNIQUE VISION Programming Contest 2023 Summer(AtCoder Beginner Contest 312) Announcement. n. _HoSSam - Codeforces cin >> a[i].first >> a[i].second; This makes query/update time $$$\log MAX$$$ where $$$MAX$$$ is the max hash value used. If you've seen these problems, a virtual contest is not for you - solve these problems in the archive. s dp dp[i][j] s[i,j] , s(u,v) O(n^2), (u,v)uvdfsdfslca, n m3perfect, medium, or bad'. I was able to make the algorithm pass by multiplying two numbers at a time then factoring the larger number. Codeforces Round #837 (Div. 2) Hossam and Friends - CSDN 2) . 185388869. Problem - 1771C - Codeforces So, let's factorize all numbers and check, For D2C it sounds pretty much like "so, just brute force it". 2), Educational Codeforces Round 152 Editorial, Educational Codeforces Round 152 [Rated for Div. DE SHAW OA (2023). Hossam wants to know if there is a successful pair of trainees. 2) +90 4qqqq To see all available qualifiers, see our documentation. 1047B - Cover Points. This now gives us an $$$O(n \log n + q \log^2 n)$$$ solution since we are binary searching for 1 log and querying the persistent segtree to check for a second log. 2) (100/100) FULL | AC Code - YouTube DM for solution telegram link:-https://t.me/codechefalive % Working Codechef &. Hossam Hassan, Assiut, Egypt. cdkrot Codeforces Round #516 (by Moscow Team Olympiad) Editorial . Everything makes sense with the trie until the part where scary hashes came in. I am getting TLE, though I used the same algorithm as in the editorial to solve the problem. Source. can someone look into my code for problem C, i don't understand whats wrong in it. ans -= (t)*(t-1)/2; The first line contains a single integer t (1t210^4), the number of test cases. uvuv, WYW___: We apologize for the delay in editorial of the tasks. http://paste.ubuntu.com/25220103/ Codeforces Round #837 (Div. 2) B. CodeForces | Hossam and Combinatorics He has n friends numbered from 1 to n. They will be arranged in a queue as follows: 1,2,3,,n. Work fast with our official CLI. If nothing happens, download GitHub Desktop and try again. #define sortall(x) sort(all(x)) 1771C - Hossam and Trainees CodeForces Solutions 3 The first line of each test case contains an integer number $$$n$$$ ($$$2 \le n \le 10^5$$$). } I am trying to learn from practice problems, but I haven't understood the solution in the editorial, what I can understood is only that each of the array element counts as a valid subsegment, therefore the answer is added by n. But I don't really understand the rest, can anyone kindly explain it . sign in on Twitter: "yukicoder No.2183 LCA on Rational Tree () https Last visit: 4 days ago. Seoul Korea Jeju Korea British Columbia Canada . typedef vector vi; tn . I only use 16M for normal c++ array(something like : int dp[2000][2000]) please someone help me, i've tried everything i can come up with but failed. In the first example, the first trainee and the second trainee make up a successful pair: $$$a_1 = 32, a_2 = 48$$$, you can choose $$$x = 4$$$. solve(); He assigned a number $$$a_i$$$ for the $$$i$$$-th trainee. It will be O(n*A*sqrt(A)/(logA) fast enouth. n n\le 2e5 a 1\le a\le 1e9 . A must-have is fast IO: ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); This unsyncs cin and cout, which makes the code faster. #include s.insert(pos,r); A. Hossam and Combinatorics num 0: x 2mp[x+num]mp[x] num 0 x C(n.2)=n(n1) My submition 198457835 get MLE in test 15. Hossam - Codeforces , WA_: 100k * 30k / 30 = 1e8 division operations. 2], I think I just did something crazy? Please 1771 A Hossam and Combinatorics Codeforces Solution - YouTube #include A. Hossam and Combinatorics solution in c++ || Codeforces Round #837 CodeYT - The Programming and Tech Blog Learn to Code from here with Lots of Assignments and Projects. , 1.1:1 2.VIP, Codeforces Round #837 (Div. The only programming contests Web 2.0 platform Programming competitions and contests, programming community. //Updating value of l to next index of last non-friend of person i I think you have flipped the statements in point C, p divides a_i and a_j rather than a_i and a_j divide p, Worth waiting for the editorial, very clear and smooth explanation for C and D, After rating of #837 rolled back my rating become 1607->1640 lol. s.insert(pos,r); If we multiply the count by two for every chosen points for the positions of the two friends can reverse, so I think the answer there should be multiplied by 2 again. I'll present a solution with a persistent trie (which is a persistent segtree) and xor hashing. 2) . Imagine we had infinite time and memory to precompute something that lets us find the xor of all the elements from $$$arr[1 \dots i]$$$ that are $$$\leq v$$$ for some $$$v$$$. Catalog. cin >> n >> m; for(auto v : s){ They usually also speed up, however they don't work on some platforms. Hossam is very tired now, so he asks you for your help! Anyways, I hope _HossamYehia_ recovers soon! With the kind of problems like F you can easily just request to print $$$ans_q$$$, it is just as hard. cout<, The final complexity is $$$O(n \log MAX + q \log MAX)$$$. 2023 https://bbs.csdn.net/topics/616418841?utm_source=blogger_star_comment https://blogdev.blog.csdn.net/article/details/129986459?utm_source=blogger_star_comment, MT0257: . Isn't problem D too standard? 2). I am not able to pass the test case 24 in A. Hossam and Combinatorics. A. Hossam and Combinatorics. Suppose that $$$hs$$$ is a hash function. Now for the first problem, we have to avoid collisions. Now, we update the left pointer to the next number and then the last element of that vector. } expert, 1859) Contribution . I was calculating prime till 1e5 getting TLE. dp[n][m]11n,mansk ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0); Contest rating: 1471 (max. #india #837#programmer #codeforcesdiv2 #codeforces#Hossamandsolution#programming #codeforcessolutions #div2 #latestcontestsolutions#programming #programmer #. DE SHAW OA (2023). Why is my code getting TLE in problem C? This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. 1 + Div. Any pair not present in this list are friends. 1381B - Unmerge. cin >> t; 2), Educational Codeforces Round 152 Editorial, Educational Codeforces Round 152 [Rated for Div. If the two left children of versions l-1 and r have a nonzero xor, we know the answer is the left children; otherwise, it is with the right children. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"Round-362-Div.2","path":"Round-362-Div.2","contentType":"directory"},{"name":"Round-363-Div . Learn more about the CLI. O(n), ACM ICPC 2013-2014, NEERC, Northern Subregional ContestA Codeforces Round #837 (Div. 2) - - Codeforces Round #837 (Div. 2) Editorial - Codeforces Now since checking is $$$O(1)$$$, the complexity is $$$O(n \log n + q \log n)$$$. , zl1648280097: SPFA Codeforces Round 837 Div 2 | Problem B : Hossam And Friends - YouTube [Codeforces] Round #837 (Div. 2) C. Hossam and Trainees | SUMFIBlog The input consists of multiple test cases. You've read 0 % Song Hayoung. 2], I think I just did something crazy? Friend of: 57 users. 979A - Pizza Pizza Pizza. c . Hossam makes a big party, and he will invite his friends to the party. Print the answer "YES" (without quotes) if there is a successful pair of trainees and "NO" otherwise. Please help, If mn[i] is the index of closest friend to the right of i, then any valid subarray with its left endpoint at index i can end at {i, i+1,, mn[i] 1}. CF 836. I would like to thank: }. Hossam makes a big party, and he will invite his friends to the party. Problem Statement - 1771B Hossam makes a big party, and he will invite his friends to the party. 1) It is possible to accidentally get a xor of $$$0$$$ with some elements that each occur an odd number of times. Round 889 Question B, Interactive Problems: Guide for Participants, Atcoder problem statement of F Cans and Openers, UNIQUE VISION Programming Contest 2023 Summer(AtCoder Beginner Contest 312) Announcement. I'm glad to invite you to Codeforces Round 788 (Div. Hossam-Mahmoud/UVA-Codeforces-Problems - GitHub The final result we would get would be the xor of all the numbers that occur an odd number of times. Why is 185759665 this code passing and 185759576 this code giving TLE verdict. Solution (4qqqq) E. Hossam and a Letter Idea: _HossamYehia_ Tutorial Solution (_HossamYehia_) F. Hossam and Range Minimum Query Idea: 4qqqq Tutorial Solution (4qqqq, trie) Solution (Aleks5d, bitset) Tutorial of Codeforces Round 837 (Div. a_i (\log n + \log \max a_i)), 2\sqrt{1e9} a 1\sqrt{1e9} 1, O(n(\frac{3e4}{\log 3e4} + \log \max a_i+\log n), n,n\le 2e3 s(u,v) u v , C. Hossam and Trainees (1600) D. Hossam and (sub-)palindromic tree (2100) E. Hossam and a Letter (2500) F. Hossam and Range Minimum Query (2500) 36. The only programming contests Web 2.0 platform, Editorial of Codeforces Round 889 (Div. How do I set my home country on Codeforces? ans += (r)*(r-1)/2; How do I set my home country on Codeforces? In bitset solution of F what does the line #pragma optimize("SEX_ON_THE_BEACH") do? Click on the graph to enable the zoom feature. Codeforces Round 837 (Div. 2) A - D - - , https://blog.csdn.net/qq_52792570/article/details/128285282. C - Hossam and Trainees aaxx > 2YES,NO YESNO Round 889 Question B, Interactive Problems: Guide for Participants, Atcoder problem statement of F Cans and Openers, UNIQUE VISION Programming Contest 2023 Summer(AtCoder Beginner Contest 312) Announcement. A subsegment of the queue is called good when all pairs of that segment are friends. Follow Me. Imagine if we took the xor of all the elements in the range $$$arr[l \dots r]$$$. k Walking on segtree is a special case of binary search where each query only relies on information aggregated in the segtree instead of a segtree query. 4, 2023 https://bbs.csdn.net/topics/616418841?utm_source=blogger_star_comment https://blogdev.blog.csdn.net/article/details/129986459?utm_source=blogger_star_comment, uvuv, n*n-1/2 , https://blog.csdn.net/m0_64158084/article/details/128306164, D1. n*n-1/2 , 1.1:1 2.VIP, x (x2)xai, xajij(ij)t(1t105)-()na1,a2an(1ai109)n(2n105)A1 =32,a2=48x=4n105, AlhodaCodingClub:Salman ElgamalAbbad, Tiny_MachineTinyML-ITIAhmed Elbanna, Tiny_Machine TinyML-ITI Ahmed Elbanna, Codeforces Round #727 (Div. The only programming contests Web 2.0 platform, Editorial of Codeforces Round 889 (Div. We can break this sum up into two prefix sums of $$$arr[1 \dots r] \oplus arr[1 \dots l]$$$. Problem - C - Codeforces. Let's first maintain a map with the key as the friend's number and for each key, there is a vector with stores numbers of all friends who don't know the friend numbered key and with a number less than the key in sorted order. cout << ans << endl; int t = i-l; The name of the problem is Hossam and Friends and its problem code is 1771B. The only programming contests Web 2.0 platform, Editorial of Codeforces Round 889 (Div. F can be solved by persistent segment tree + xor hash with a very straightforward thought. In problem A, 3rd test case where all elements are same, the expected answer is wrong. Hossam woke up bored, so he decided to create an interesting array with his friend Hazem. while (t--) Use Git or checkout with SVN using the web URL. Hossam Doma, Rosetta, Egypt. CODE, The only programming contests Web 2.0 platform, https://en.wikipedia.org/wiki/Prime-counting_function, https://codeforces.com/contest/1771/submission/185215774, https://en.wikipedia.org/wiki/Prime_number_theorem#Statement, Editorial of Codeforces Round 889 (Div. Hossam and Trainees - CodeForces 1771C - Virtual Judge. Is it reasonable to believe that the ratings were blown out of proportion? 1 + Div. if(s.find(s3)!=string::npos) Binary search question. GitHub: Let's build from here GitHub . F 262144 kB. Bro no problem, I was just kidding, we knew there must be some issues, otherwise editorials comes out soon. 2], I think I just did something crazy? This post is only for educational and learning purposes. 1771C - Hossam and Trainees GNU C++17 Accepted: 1216 ms 400 KB 184840570: Dec/12/2022 06:48: roycf123: 1771C - Hossam and Trainees GNU C++20 (64) Accepted: 920 ms 4900 KB 184850468: Dec/12/2022 09:06: jyotirmoysaha096: 1771C - Hossam and Trainees GNU C++20 (64) , weake12: x (x2)xai, xajij(ij), t(1t105), na1,a2an(1ai109), -(), : ,sqrt(1e9),n,,,, 908B - New Year and Buggy Bot. He assigned a number $$$a_i$$$ for the $$$i$$$-th trainee. Problem E is really simple. After compressing the elements, let the $$$j$$$th leaf of the $$$i$$$th segment tree store $$$hs(j)$$$ if $$$j$$$ has occured an odd number of times up to index $$$i$$$, and $$$0$$$ otherwise, and store in each node the XOR of its children. map> s; A subsegment of the queue starting from the friend a and ending at the friend b is [a,a+1,a+2,,b]. C Articles 6816 Tags 186 Categories 64. There are no STL or struct or any possible thing which will lead to MLE. #define int int64_t 2) C. Hossam and Trainees](https://codeforces.com/contest/1771/problem/C)- $set$ - , Hossam and Trainees Codeforces solution |Codeforces Round - YouTube int ans = n; Hossam_Hassan. - Codeforces A check would be a query from $$$(0, v)$$$ on $$$st[l-1]$$$ xored with a query from $$$(0, v)$$$ on $$$st[r]$$$. s[max(a[i].first,a[i].second)].pb(min(a[i].first,a[i].second)); Are you sure you want to create this branch? Time : You will be given 6 problems and 2 hours to solve them. Codeforces Round #837 (Div. 2) Solutions - Hossam and Friends Solution sortall(s[v.first]); From Assiut University. Sorry, tutorial was written by me :( But Hossam solution is fast enough. A. Hossam and Combinatorics codeforces Solution - YouTube Thanks you so much, really. ll sum[10001, As the question says to find the number of good contiguous subsegments, we can use the two-pointer approach to find all such subsegments. Count the number of interesting pairs (ai,aj) ( a i, a j) that meet all the following conditions: 1 + Div. #include <bits/stdc++.h> using namespace std; vector<int> isprime(100010); vector<int> primes; void solve() { int n;cin>>n . Status - Codeforces The first line of each test case contains two integer numbers n and m (2n10^5, 0m10^5) representing the number of friends and the number of pairs, respectively. for(int i = 0;iCodeforces Round #837 (Div. 2)(A-C) - (the Longest Palindromic Subsequence DP can be easily searchable). Problem ratings were released just now. j <- ch[j][c] //cs[i]-'a', P2709B Solve more problems and we will show you more here! 742A - Arpa's hard exam and Mehrdad's naive cheat. GitHub: Let's build from here GitHub I can just give you some general tips how to speed up your code. hossam.hssan47777@gmail.com. Our friend _HossamYehia_ is sick, so he couldn't write editorial fast. However, you must remove it on interactive problems, and you mustn't use "endl", use '\n' instead. #define endl "\n" But editorial of F is already long, so i decided dont add third solution here. Then, simply bash out all possible middle lengths, and you get the answer relatively easily. vector> a(m); I can't understand the editorial. er Bot on Twitter: "physics0523 ( @butsurizuki ) <Codeforces I use these: pragma GCC optimize("O3,unroll-loops") pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt") They start with symbol #, just as include does. I don't know if this can pass, but we can improve queries to only be $$$\log n$$$. Codeforces Round #837 (Div.

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