RJB

• Username: 5★kut_kjb
• Country:  North Korea
• Student/Professional:Student
• Institution:Kim Chaek University of Technology
• CodeChef Pro Plan: No Active Plan. View Details

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Last 6 Months 2025 (Jul-Dec)2025 (Jan-Jun)2024 (Jul-Dec)2024 (Jan-Jun)

Rating Graph

No. of Contests Participated: 9

Current Ratings Graph Old Ratings Graph

2130 (-74)RatingProvisional
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Starters 192 (Rated till 6 star)(2025-06-25 22:00:00)

Global Rank:   146

Cheated in:   

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(2025-06-25 22:00:00)

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2269 (-20)RatingProvisional
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April Lunchtime 2017(2022-12-20 00:00:00)

Global Rank:   35

Cheated in:   

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(2022-12-20 00:00:00)

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Learning Paths (0)

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Practice Paths (0)

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Contests (9)

January Lunchtime 2015

Piece of cake, Candidate walk, Just multiply, Many bananas

March Lunchtime 2015

Chef Anup

March Cook-Off 2017

Rainbow Graph, Yet Another Card Game, Safe Robot

April Cook-Off 2017

Bear and Shop Trip, Bear and Candies 123, Bear and AB

March Lunchtime 2017

Bear and Ladder, Bear and Species

April Lunchtime 2017

Bear and Digit Virus, Bear and Segments, Bear and Segment 01

May Lunchtime 2017

Prefix Inversions

Alkhwarizm 2017 (Rated)

Logan and his XOR debacle, X-24 and his SUBSET code, Charles and the BRUTAL subsequences, Professor X and Grouping of Numbers

IOPC 2017 (Rated)

The Birthday Tears, Game Of Life, Max Out, Christmas Time

February Long 2022 - I, Division 1 (Unrated)

Random OR, Digit Multiplication By K, Binary Base Basics, Bitwise Blend, Remove Adjacent

February Long 2022 - II, Division 1 (Unrated)

Sequence GCD, Area Sums in Convex Polygons, Bitwise swaps, Xor Palindrome

March Long One 2022, Division 1 (Unrated)

Subarray XOR, Substring of a Substring, Count the Ones, Exact Marks, MEX on Trees

March Long Two 2022, Division 1 (Unrated)

Same Parity Swaps in Binary Strings, Kostomuksha and AESC MSU

April Long One 2022 Division 1 (Unrated)

Yet Another Mex Problem, Dazzling AXNODR Challenge , Bullets and Enemies, Min Max Equality, Pairwise Xors

May Long One 2022 Division 1 (Unrated)

Mystical Numbers, In The Green Zone, The Magical Stone, Alternating Diameter, Four Arrays

May Long Two 2022 Division 1 (Unrated)

Subarray Weight, Subsequence-Numbers Divisible by 7, Subarrays with length

June Long One 2022 Division 1 (Unrated)

Full Path Eraser, Expected move, Reduce to zero, Add By Permutation, Divisible by i , Possible GCD

June Long Two 2022 Division 1 (Unrated)

Counting Is Fun, Gcd and Lcm , AP Grid, The Subarray XOR, Reversal Sorting

July Long Two 2022 Division 1 (Unrated)

Maximize Difference, Concat Sort, Sum of Product 2, Similar Subsequence

August Long 2022 Division 1 (Unrated)

Angled Flip, Tree of Trees, XOR with smallest element, Hello Equation, Crazy Subsequences

September Long 2022 Division 1 (Unrated)

Distinct Numbers, Pokemon Battles, Alone Alice!, Interesting Subarray

October Long 2022 Division 1 (Unrated)

A drawing game, Chef And Array Construction, Twos and Zeros, Binary Substituition

November Long 2022 Division 1 (Unrated)

MaxEdges, Minimize swaps, Minimum BFS Length, Alice and the Array

December Long 2022 Division 1 (Unrated)

Counting Subsequences, Not Divisible, Break into Powers, Sum of Cube , Divisible by A_i

January Long 2023 Division 1 (Unrated)

A Short Counting Problem, Swap Shift, Maximum of GCDs, Symmetric Swaps, Minimize the Maximum

Starters 138 Division 1 (Rated till 6-Stars)

A power B mod C , TRIPLE PRIMES, Prefix Suffix Inequality, Distinct Substring

Starters 192 (Rated till 6 star)

Equate XY, No 3 Please!

Total Problems Solved: 130