Hello sir, I am doing CP for over a year now(though not on CF) and have learnt basic algorithms(those taught in 6.006 class MIT). \underbrace{s_{i+2^{k-1}} \dots s_{i+2^k-1}}_{\text{length} = 2^{k-1},~ \text{class} = c[i + 2^{k-1}]} pair of primes codechef solution; pool warehouse. Colonel Stephanie Sanderson. HackerRank Forming a Magic Square problem solution.YASH PAL March 26, 2021. LCP queries can be answered by performing RMQ queries (range minimum queries) in this array, so for different implementations it is possible to achieve logarithmic and even constant query time. if the smallest substring of length $2^{k-1}$ starts at position $i$, then the substring of length $2^k$ with the smallest second half starts at $i - 2^{k-1}$). Duplicate Words problem solution. Randomized algo, http://codeforces.com/contest/862/problem/D (4) //NICE! Count characters to be shifted from the start or end of a string to obtain another string. i mean what is LA?? chase herbstreit stats apartments for rent 77039 / 13 hours ago. Learn more. Anyway thanks a lot BRO!!!. Ok never came across the acronym before :).Thnx for the prompt reply. only lowercase letters, then this implementation can obviously be optimized. Nov. 29, 2013— -- Despite facing a disastrous rollout of his health care plan, criticism over his policies and approval ratings that have plunged to an all-time low, President Even though many people undeestimate this, it is very important to get to phase where you can code what you know (well, it might sound stupid, but many times one know a solution one hour before end of contest, yet he ends coding 10 minutes before end when he starts his 20 minute debugging phase [and both could be significantly reduced]). The reason for this is, that we only add vertices with equal distance or with distance plus one to the queue during each iteration. Note that it is assumed that the function gets called with the already calculated $k$. 1. Thus if we have such an array $\text{lcp}$, then the problem is reduced to the RMQ, which has many wide number of different solutions with different complexities. So only by simple subtractions we can sort the second elements of the pairs in $p[]$. Google offers you the prize based on your performance in the contest. \overbrace{\underbrace{s_j \dots s_{j+l-2^k} \dots s_{j+2^k-1}}_{2^k} \dots s_{j+l-1}}^{\text{second}} ], http://codeforces.com/contest/122/problem/C (3) //Just around 2^10 lucky [RECURSION], 7899 Mr. Panda and Strips (4) //Weak test-cases, 7671 What a Beautiful Lake (2) //Try up/down from every node, http://codeforces.com/contest/110/problem/A (1) //4 or 7, http://codeforces.com/contest/106/problem/B (2) //Cycles -_-, http://codeforces.com/contest/895/problem/A (2) //All segments [in circle], http://codeforces.com/contest/893/problem/B (2) //Try each divisor, http://codeforces.com/contest/894/problem/A (1) //3-cycles, http://codeforces.com/contest/892/problem/C (3) //Try to find "1" ASAP, http://codeforces.com/contest/102/problem/A (2) //Iterate over all triples, http://codeforces.com/contest/96/problem/B (2) //Check all, http://codeforces.com/contest/94/problem/B (1) //3cycles, http://codeforces.com/contest/887/problem/B (3) //Test all numbers, http://codeforces.com/gym/101597/problem/A (4) //[MATH][MODULO][SIMULATION], http://codeforces.com/contest/68/problem/C (5) //[VERY NICE][RECURSION][MAX COST MIN FLOW], http://codeforces.com/contest/68/problem/A (1) //Simple simulation, http://codeforces.com/contest/66/problem/B (2) //Test always whole platform, http://codeforces.com/contest/46/problem/C (2) //[2pointers][N^2 works too], http://codeforces.com/contest/47/problem/D (4) //[Implementation][DFS], http://codeforces.com/contest/51/problem/D (4) //Check all/check without 1s/2nd, http://code-festival-2017-qualc.contest.atcoder.jp/tasks/code_festival_2017_qualc_b (2), http://codeforces.com/contest/53/problem/B (3) //at most 60 possibilities, http://codeforces.com/contest/55/problem/B (3) //Try all permutations & possibilities [NICE], http://codeforces.com/contest/877/problem/B (3) //NICE [N^2][PrefixSum], LA 6623 Battle for Silver (3) //4 for-cycles inside ~ K4 search, http://codeforces.com/contest/725/problem/C 4, http://codeforces.com/contest/725/problem/E 6, http://codeforces.com/contest/724/problem/B 3, http://codeforces.com/contest/753/problem/C 7, http://codeforces.com/contest/698/problem/D 8 //with geometry, http://codeforces.com/gym/101840 F //[NICE][BS][DISTANCE], 11206 UVA (6) //4^20 (but somehow passes), 11127 UVA (4) //Simple dfs [just realize you can do so], http://www.spoj.com/problems/BOKAM143SOU/ (3) //just implement for-cycles, http://www.spoj.com/problems/BLOPER/ (4) dfs with little pruning, 13173 UVA (3) //just brute-force + branching, http://codeforces.com/contest/799/problem/D (4) //VERY NICE [only top 34 needed] trick with 2 [~20], 10890 UVA (4) //Simple brute-force times out, but with simple pruning AC (answer detection, http://codeforces.com/contest/813/problem/B (3) //All*All (BF) care for overflow! nope it is not. 2. So math but basically different approach ^_^. We will need an additional array $\text{rank}$, which will give us the position of a suffix in the sorted list of suffixes. It will just take him more time to come-up with solution and/or to code the solution. Therefore the algorithm runs in $O(n)$ time. http://www.spoj.com/problems/SGIFT/ (4) //BS works too, http://www.spoj.com/problems/SUMSUM/ (5) //Bit-by-Bit cnt 0/1, http://www.spoj.com/problems/AKVQLD03/ (3) //Classical fenwick easy, http://www.spoj.com/problems/ZIGZAG2/ (6) //Very nice FW + BS + DP, http://codeforces.com/contest/849/problem/E (7) //2D Fenwick / ST+TP [NICE], http://www.spoj.com/problems/CRAYON/ (5) //VERY NICE [2*FW begin + end], http://www.spoj.com/problems/NITT8/ (4) //Norm. All you need today is math, some thinking and three lines of code. first you need to compare the two blocks starting at $i$ and $j$, and if these are equal then compare the two blocks ending in positions $i + l - 1$ and $j + l - 1$: Here is the implementation of the comparison. You cannot participate in a contest if you are under sixteen (16) years old. Also, as you can see, my progress is not that good so maybe it would be better to ask some red-coder (or nutela). http://www.spoj.com/problems/NTHPRIME/ (7) // BS + NumPrime GOOD!! rar 20.25 basic 6.50 full version crack in..RAR files, macOS 10.10, Mac Os X, iOs Apps. Has anybody counted ? Well firstly, I've not read the book so not sure if my answer will be "valid". if one substring is smaller than the other, then it should also have a smaller class label. $i$ and $j$ get added by the current power of two. & abaab \\ Assuming there exists a $u$ in the queue with $d[u] - d[v] > 1$, then $u$ must have been insert in the queue via a different vertex $t$ with $d[t] \ge d[u] - 1 > d[v]$. In your MO part there is a problem(https://toph.ws/p/distinct-dishting). http://www.spoj.com/problems/DTPOLY/ (5) //DP might work too, http://www.spoj.com/problems/DTPOLY2/ (7) //Harder version of above (NICE but hell), http://www.spoj.com/problems/HC12/ (3) //NICE Sort + C(i,K-1)*A[i], http://www.spoj.com/problems/STONE2/ (4) //NICE Mostly DP [INVERSION][FACTORIAL], http://www.spoj.com/problems/MAIN8_D/ (5) //NICE Suffixes/Prefixes (same add 2^i), http://www.spoj.com/problems/ITRIX_E/ (4) //VERY NICE #Nonattacking 2-queens, http://www.spoj.com/problems/MAXSUB/ (3) //NICE Subsets made of zeroes, http://www.spoj.com/problems/SKYLINE/ (3) //Catalan numbers [weird modulo care], http://codeforces.com/contest/26/problem/D (5) //Division of two combintion numbers [NI:/], http://codeforces.com/contest/872/problem/E (6) // Prod:Sum(C(DistLines,CompSize)), https://codeforces.com/contest/1174/problem/C (4) //[VERY NICE][SIEVE], https://codeforces.com/contest/1173/problem/B (3) //[VERY NICE][MATH], https://codeforces.com/contest/1202/problem/D (4) //[NICE][MATH][GREEDY], https://codeforces.com/contest/1199/problem/E (5) //[VERY NICE! . I appreciate all of the div 1 codeforcers helping out the rest of us! I also use the Categories section on ahmed_aly's A2 online judge. We can simply use a normal queue, and append new vertices at the beginning if the corresponding edge has weight $0$, i.e. We can create the suffix array for the text $t$ in $O(|t| \log |t|)$ time. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. http://www.spoj.com/problems/IITKWPCE/ (4) //Palindromes [efficiency!] Good Day to you! For more information related to Rules and Terms, and to check if you are eligible for the contest, visit. Anyone can add any type of valid html-css web page depends on you. So my idea is to divide the problems in each category by the problem's website to make it easier to navigate. ), 10732 UVA (2) //Brute-force passes .. just don't trust them O(N^2), 10748 UVA (5) //VERY Nice (knights have K^2 moves not 8^K), http://codeforces.com/contest/818/problem/D (4) //NICE for each 'A' check all remaining (max SQRT), http://codeforces.com/contest/834/problem/E (5) //NICE hard to imple: all 11122999 OK, http://www.spoj.com/problems/JHAGIRLS/ (4) //Efficient or store output in array, http://codeforces.com/contest/846/problem/B (3) //Brute-force, http://www.spoj.com/problems/ALONE/ (4) //Generate everything <10^15 [NICE], http://codeforces.com/contest/861/problem/B (3) //Check all floor-sizes, http://www.spoj.com/problems/RRANGE/ (3) //Compare all queries agains all updates + GAUSS, http://codeforces.com/contest/598/problem/B (3) //Treap works too ;-), http://www.spoj.com/problems/AMR10I/ (4) //Can be solved with brute-force with dp, http://codeforces.com/contest/868/problem/C (4) //Brute-force (fixet at most 6 each bits), http://codeforces.com/contest/868/problem/D (5) //NICE: Maximal K is low (I assumed 15), http://codeforces.com/contest/31/problem/C (2) //LOW-Constaints: N^2, http://codeforces.com/contest/32/problem/D (3) //Simply try all possibilities, http://codeforces.com/contest/876/problem/C (3) //Try N and ~100 lower, http://codeforces.com/contest/44/problem/B (2) //N^2 works fine, https://codeforces.com/gym/101991/problem/A (5) //[VERY NICE][FW], http://codeforces.com/gym/101864 D //[NICE][SACK][ARPA][HLD], http://codeforces.com/gym/101840 E //NICE, http://codeforces.com/contest/715/problem/C 9, http://codeforces.com/contest/741/problem/D 8, http://codeforces.com/contest/752/problem/F 5, http://codeforces.com/contest/766/problem/E 6, http://codeforces.com/contest/833/problem/D 7 //Very nice hard (thinking + imple) + FW, http://www.spoj.com/problems/HOLI/ (4) //VERY NICE: 2*Distances from centroids, https://codeforces.com/gym/102006/problem/K (6) //[VERY NICE][THEOREM][OBSERVATION], http://codeforces.com/contest/741/problem/C 6, http://codeforces.com/contest/664/problem/D 4, https://codeforces.com/contest/1173/problem/D (4) //[VERY NICE][DFS][FACTORIAL], https://atcoder.jp/contests/abc136/tasks/abc136_f (5) //[VERY NICE][IE][POWER][FENWICK], https://codeforces.com/contest/1178/problem/C (3) //[NICE][EASY][POWER], https://codeforces.com/gym/101972/problem/J (4) //[NICE][THEOREM][COMB-NUMBERS], https://codeforces.com/gym/101972/problem/I (5) //[NICE][SHORT][COMB-NUMBERS], http://codeforces.com/gym/101628/problem/G (5) //[NICE][COMB-NUMBERS], http://codeforces.com/gym/101864 E //Combination number, power, http://codeforces.com/gym/101879/problem/E (2) //Power of 2, http://codeforces.com/gym/101873 (5) //Necklace (mby burnside), http://codeforces.com/gym/101808/problem/F (3) //[EASY]][FACTORIAL], http://codeforces.com/problemset/problem/364/A (4) //[NICE][STL-or-sorting][IF], http://codeforces.com/contest/145/problem/D (7) //[VERY NICE][SET][OBSERVATION][BS][BIG], http://codeforces.com/contest/909/problem/B (3), http://codeforces.com/contest/131/problem/C (3) //[EASY][BRUTE-FORCE][COMB-NUMBERS], http://codeforces.com/contest/131/problem/B (2) //[EASY], http://codeforces.com/contest/129/problem/E (5) //[NICE][COMB-NUMBERS]//Observe, http://codeforces.com/contest/111/problem/D (5) //[COMB-NUMBERS][POWER][VERY NICE][DP], http://codeforces.com/contest/895/problem/D (4) //[COMB-NUMBERS][OPTI], http://codeforces.com/contest/893/problem/E (5) //[COMB-NUMBERS][NUMBER-THEORY], http://codeforces.com/contest/894/problem/B (3) //try without last row, http://codeforces.com/contest/890/problem/E (6) //Permutations, http://codeforces.com/contest/52/problem/B (4) //[NICE][PREPROCESS][ROTATION], 3917 //Grid tiling [fancy approximation fomula], http://codeforces.com/contest/760/problem/F, https://devskill.com/CodingProblems/ViewProblem/61, https://devskill.com/CodingProblems/ViewProblem/255, http://www.spoj.com/problems/HLP_RAMS/ //Comb parity, Project Euler #78: Coin partitions //Partition function, http://www.spoj.com/problems/MAIN75/ //DP #of trees, http://codeforces.com/contest/666/problem/C 7, http://www.spoj.com/problems/JOKER1/ 3 prod(Ai-i), http://codeforces.com/contest/645/problem/E (5) //formula: A[i]=Sum(A)+1, http://www.spoj.com/problems/SPCE/ (5) // N^{K-2}*Prod(comp_size), http://codeforces.com/contest/785/problem/D (5) // F'(' C"(+)-1","(", http://codeforces.com/contest/816/problem/D (5) // Observation, http://codeforces.com/contest/844/problem/B (2) //Easy pro prvaky, http://www.spoj.com/problems/JOSWAP/ (3) //Frequence array, http://www.spoj.com/problems/UCV2013E/ (4) //NICE&EASY: Choose steps to direction, http://www.spoj.com/problems/PARCARD1/ (4) //Partition function (raw), http://www.spoj.com/problems/GOODB/ (2) //Easy (NICE): Choose [order]. It indeed might be hard to code and even more difficult to come with. The only thing left is to compute the equivalence classes $c[]$, but as before this can be done by simply iterating over the sorted permutation $p[]$ and comparing neighboring pairs. & bbb\$da & bbb \\ No clue how the problem tag you mentioned, of DAG, would help. \dots 2. I have saved your code on one of the repls, so you can just run and get the file directly (Link). Great efforts in Compilation, really useful. Because the suffixes are sorted, it is clear that the current suffix $p[i]$ will give new substrings for all its prefixes, except for the prefixes that coincide with the suffix $p[i-1]$. & b\$dabb & b \\ Right done dfs, http://codeforces.com/contest/802/problem/K (5) //Slightly DP-like (NICE) TREE, http://codeforces.com/contest/813/problem/C (3) //Simply 2 DFS: NICE + EASY, http://codeforces.com/contest/841/problem/D (4) //DFS while tracking "next", http://codeforces.com/contest/845/problem/G (5) //Keep track of cycles, http://codeforces.com/contest/844/problem/E (5) //Post-Order line, Connect i N-2: star, http://www.spoj.com/problems/CAC/ (5) //VERY NICE! You will also receive a summary certificate. Google Internship 2020 - Google Online Challenge(1st Coding Round), Google Cloud Platform - Creating Google Cloud Console Account & Projects, Get Placed in Google with Google Test Series By GeeksforGeeks, Google SWE Interview Experience (Google Online Coding Challenge) 2022, Best Way To Start With Competitive Programming - GeeksforGeeks CP Live Course. Nearly Lucky Number a2oj.py . There are some problems that have very nice randomized solutions, and sometimes they aren't the intended solutions, but I believe randomization can sometimes be very powerful and interesting. ST 10^9 + ST/RMQ 10^5, http://codeforces.com/contest/794/problem/F (7) //Digit by digit! Example 1: Input: [2, 1, 5, 2, 3, 2], S=7 Output: 2 Explanation: The smallest subarray with a sum great than or equal to. http://www.spoj.com/problems/TRKNIGHT/ //?? http://codeforces.com/contest/808/problem/E (5) //NICE! "There are also fashionable covers available to go over the diapers that can make them less unsightly and even a little fun," Sheen says. In fact we take the suffixes in sorted order and see what prefixes give new substrings. Did you simply miss HLD or it's there but I can't find it? (BIG%9), 10844 UVA 4 //Bell numbers + big (might be slightly slow! perm], http://codeforces.com/contest/51/my (2) //Lex-lowest-string (|s|=4), http://codeforces.com/contest/54/problem/A (2) //Single sweep, http://codeforces.com/contest/719/problem/C 3, http://codeforces.com/contest/747/problem/E 4, http://codeforces.com/contest/754/problem/C 5, http://codeforces.com/contest/678/problem/B 2 //calendar days, http://codeforces.com/contest/643/problem/A 3 //easy just simulate, http://codeforces.com/contest/770/problem/D 5 //easy but pain draw, http://codeforces.com/contest/789/problem/B 3 //simulate (mby twice), http://codeforces.com/contest/828/problem/B 2 //EASY & NICE just analysis, http://codeforces.com/contest/825/problem/B 2 //EASY & NICE Piskvorky pro prvaky, http://codeforces.com/contest/837/problem/B 2 //Just implementation, http://codeforces.com/contest/837/problem/C 2 //Some nasty iffs, http://codeforces.com/contest/845/problem/B 2 //Easy pro prvaky, http://codeforces.com/contest/845/problem/D 3 //Iffs folow the rules, http://www.spoj.com/problems/UNIHW/ 4 //NICE (but many iffs), http://codeforces.com/contest/5/problem/A (2) //Parsing, http://codeforces.com/contest/5/problem/B (3) //Output formating, http://codeforces.com/contest/6/problem/B (2) //Simply check by adjancecy vector + set, http://codeforces.com/contest/7/problem/A (1) //Oneinteresting if, http://codeforces.com/contest/8/problem/B (2) //Sample vectors + set/or/array, http://codeforces.com/contest/12/problem/A (1) //Find mirror by middle, http://codeforces.com/contest/16/problem/A (1) //Easy check of chars, http://codeforces.com/contest/21/problem/A (2) //Easy but nasty iff imple, http://codeforces.com/contest/31/problem/B (2) //Boring imple, http://codeforces.com/contest/34/problem/C (3) //Easy string parsing, http://codeforces.com/contest/41/problem/C (2) //String parsing, http://www.spoj.com/problems/KPRIMESB/ (4), http://www.spoj.com/problems/IITKWPCH/ (4) //NICE on bits, http://www.spoj.com/problems/SUBSET/ (5) //VERY NICE 3^10 (^2 but not exactly) (+ sorting), https://www.hackerearth.com/practice/algorithms/dynamic-programming/bit-masking/practice-problems/algorithm/special-pairs-7/description/ (4) //NICE [Brute-force], http://codeforces.com/contest/897/problem/D (4) //NICE! Managed to solve it in just O(N) and N is only <= 100. \end{array}$$, $$\dots Also sometimes it is interesting to peek to solution of others even (or maybe BEST) after you solve the problem. If nothing happens, download Xcode and try again. Congrats, I see you managed to get around 504-Gateway Time-out. You must be eighteen (18) years of age or older at the time of registration to be eligible to be contacted by a Google recruiter. Pretty neat. ], https://www.hackerrank.com/contests/mathemagic-bits/challenges/degree-diameter-on-trees [accesable? We use here the technique on which radix sort is based: to sort the pairs we first sort them by the second element, and then by the first element (with a stable sort, i.e. http://www.spoj.com/problems/CHAIR/ (3) //Maybe combinatorics too? -> Write a program in C++, C, Java, Python, or any other programming language you know ], https://www.codechef.com/problems/KBIGNUMB, http://codeforces.com/problemset/problem/718/C, http://codeforces.com/problemset/problem/621/E, Project Euler #114: Counting block combinations I, http://codeforces.com/problemset/problem/821/E, https://www.codechef.com/AUG16/problems/SHAIKHGN //Not exactly but similar principle, 10743 UVA (5) //A001169 [easy multi / hard to come with recurence], http://codeforces.com/contest/821/problem/E (6) //Not trivial to come-up with matrix, http://www.spoj.com/problems/DCEPCA06/ (4) //NICE 10x10 matrix, http://www.spoj.com/problems/GSWORDS/ (3) //NICE&EASY 3-states "OO,OX,XO", http://www.spoj.com/problems/TETRAHRD/ (4) //Easy + Sum, http://www.spoj.com/problems/NACCI/ (4) //Classical (N-Bonacci), http://www.spoj.com/problems/JZPCIR/ (5) //VERY NICE: A137726, https://www.urionlinejudge.com.br/judge/en/problems/view/1617 (4) //[BASIC], 13288 Cordon Bleu (6) //[NICE][MATCHING], http://codeforces.com/gym/100800 (Aqueduct Construction A), http://codeforces.com/contest/863/problem/F (5) //VERY NICE, http://codeforces.com/contest/802/problem/C (8) //Nice but hard to see + negative, http://codeforces.com/contest/802/problem/N (5) //Easy but faster MCMF needed, http://codeforces.com/contest/818/problem/G (6) //NICE + MUCH Faster MCMF, http://www.spoj.com/problems/BNMT/ (7) //VERY NICE (some optimalisations needed + weird data set), http://codeforces.com/contest/884/problem/F (6) //Alphabetical buckets, http://codeforces.com/contest/713/problem/C 7, http://www.spoj.com/problems/RMID/ 3 (as above just not so dynamic), http://www.spoj.com/problems/EC_ESTA/ 4 //classical dynamic median, http://www.spoj.com/problems/DCEPCA09/ (6) //VERY NICE [MO +++ MEDIAN, MEAN, FREQ], http://codeforces.com/contest/912/problem/E (5) //[VERY NICE][BS][2P][PRIMES], http://codeforces.com/contest/888/problem/E (4) //NICE[EASY], http://codeforces.com/contest/51/problem/E (6) //NICE[GRAPH][Cycles of length 5], https://devskill.com/CodingProblems/ViewProblem/245, https://devskill.com/CodingProblems/ViewProblem/256, http://www.spoj.com/problems/COLOR_CC/ (4) //VERY NICE div by partity (take lesser) 8^6, http://www.spoj.com/problems/ADAUNIQ/ [Updates], https://www.spoj.com/problems/MOZHSLS/ (5) //[VERY NICE], http://www.spoj.com/problems/ADAFTBLL/ [Tree][Updates], http://codeforces.com/gym/101879/problem/H (5) //[NICE][CLASSICAL][FREQUENCIES][FENWICK][BS], http://codeforces.com/contest/86/problem/D (4) //[NICE][CLASSICAL], http://codeforces.com/contest/877/problem/F (6) //[NICE][NORMALIZE], http://codeforces.com/problemset/problem/687/D, http://codeforces.com/problemset/problem/617/E, https://www.codechef.com/problems/DISTNUM3 //Tree + Update.
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