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As of October 2023, Korotkevich is the highest-rated programmer on CodeChef, [2] Topcoder, [3] AtCoder [4] and HackerRank. [5] On 30th August 2024, he achieved a historic rating of 4009 on Codeforces , becoming the first to break the 4000 barrier. [ 6 ]
The second problem of each day is locked until the completion of the first part, and usually follows on from it logically. There are both global and private leaderboards for each year, where rankings are based on who solves the problem first. CodeChef [17] [18]
Euler diagram for P, NP, NP-complete, and NP-hard set of problems. Under the assumption that P ≠ NP, the existence of problems within NP but outside both P and NP-complete was established by Ladner. [1] In computational complexity theory, NP (nondeterministic polynomial time) is a complexity class used to classify decision problems.
Typically such limits show a factor of approximation beyond which a problem becomes NP-hard, implying that finding a polynomial time approximation for the problem is impossible unless NP=P. Some hardness of approximation results, however, are based on other hypotheses, a notable one among which is the unique games conjecture .
Many worst-case computational problems are known to be hard or even complete for some complexity class, in particular NP-hard (but often also PSPACE-hard, PPAD-hard, etc.). This means that they are at least as hard as any problem in the class C {\displaystyle C} .
He has used Codeforces problems in his class, 15-295: Competition Programming and Problem Solving. [20] At the National University of Singapore , Codeforces rating is also used as an entrance qualifying criterion for registering for a 4-unit course, CS3233 Competitive Programming, as students have to achieve a rating of at least 1559 to be able ...
A minimum spanning tree of a weighted planar graph.Finding a minimum spanning tree is a common problem involving combinatorial optimization. Combinatorial optimization is a subfield of mathematical optimization that consists of finding an optimal object from a finite set of objects, [1] where the set of feasible solutions is discrete or can be reduced to a discrete set.
Word problem for linear bounded automata [25]; Word problem for quasi-realtime automata [26]; Emptiness problem for a nondeterministic two-way finite state automaton [27] [28] ...