Andrew He

• Username: 7★ecnerwala
• Country:  United States
• Student/Professional:Other
• 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: 16

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June Cook-Off 2022 Division 1 (Rated)(2022-06-05 22:30:00)

Global Rank:   2

Cheated in:   

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(2022-06-05 22:30:00)

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2925 (-97)RatingProvisional
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June Cook-Off 2022 Division 1 (Rated)(2022-12-20 00:00:00)

Global Rank:   2

Cheated in:   

Ratings System Update

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

This is the difference due to changing the rating system.This graph is not updated after 20th Dec 2022. Know more

How the rating system works?

Learning Paths (0)

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Contests (16)

July Challenge 2013

The Probability Of Winning, Chef and Walking on the rectangle , Count K-Primes

August Challenge 2014

Mountain Holidays 2, Chef and Reversing, The Leaking Robot, Cleaning Tables, Chef and Gift

December Challenge 2015

Chef and the stones, Plane Division, Oracle Devu and Longest Common Subsequence, Chef and Filters

September Challenge 2018 Division 2

Magician versus Chef, War of XORs, Chef and Adventures

January Challenge 2019 Division 2

Yet Another Problem About Sequences, Different Neighbours, Lucky Number Game, Distinct Pairs, Chef and Modulo Game, Fancy Quotes, A Pizza Slice

December Challenge 2020 Division 1

Hail XOR, Square Root of LCA Convolution, Calculus, Linear Combination, Permutations, Digit Matrix, String Operations, Palindromic Equivalence, Positive Prefixes, Even Pair Sum, Vaccine Production, Vaccine Distribution

December Cook-Off 2020 Division 1

Mysterious Sequence, Self-Destructing Strings, Sed Passwords, On Graphs, Probability Theory and Cakes, Catch the Thief, Circle of Chaos, Carry All Fruits, Sweet Rectangles, Minimum Attendance Requirement

January Cook-Off 2021 Division 1

Mex Subsequence, Not Too Colourful, Prime Tuples, Distinct Pair Sums, Partition Ways, Maximise Islands, Prefix And, Common Ancestors, Password, Equal Gifts

December Lunchtime 2020 Division 1 (Unrated)

K-Tuple Tree, Even Sequence, Three Letters, One Zero Swaps

March Cook-Off 2021 Division 1

Consecutive Deletions, Water Transfer, Sort String, Chef and Sorting, Hill Sequence

February Lunchtime 2021 Division 1

Average Sorting, Sed Max, Chef and Reordering, Hot Meals and Queues, Independent Set

SnackDown 2021 - Online Qualifiers

Lucky Number

SnackDown 2021 - Online Round 1A

Yet Another Flipping Problem, Round Robin Ranks , Dance Moves, Equal Beauty, Lazy Machine, Min Max LCM

SnackDown 2021 - Online Pre-Elimination

Non-Decreasing Subsequence of size K, Good ranking, Product Pain, Guests like slippers, Mega mu - 1, Mega mu - 2, Guess the row

SnackDown 2021 - Online Elimination Round (Rated for all)

One Change Subsequences, Random Convex Hull, Graduate Work Matters, Sorting Segments

December Lunchtime 2021 Division 1

In-tree-active Node Coloring, Chef and Vacation Transportation , Chef Loves 1010, Maximum Trio, Optimal Sorting, Counting manuls, Romantic Reversals, Sleep Technique , Point constraints

May Lunchtime 2022 Division 1 (Rated)

Bucket and Water Flow , Apples and Oranges, Binary String Game, Maximum Pairwise Modular Sum, Balanced 0-1 Tree, Equal After And, Rearrange Ranges, Smallest Element In Progression, How many unattempted problems, Problems in your to-do list

June Cook-Off 2022 Division 1 (Rated)

Permutation Segments, Throw and Take, Simple XOR, Prefix Suffix Distinct, Split AND Sum, Max Minus Min

Total Problems Solved: 140