Nguyen Hoang Duc

• Username: 4★lazycoder97
• Country:  Vietnam
• Student/Professional:Professional
• Organisation:Coc Coc
• CodeChef Pro Plan: No Active Plan. View Details

Submissions Heat Map

Last 6 Months 2026 (Jan-Jun)2025 (Jul-Dec)2025 (Jan-Jun)

Rating Graph

No. of Contests Participated: 25

Current Ratings Graph Old Ratings Graph

1992 (-50)RatingProvisional
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August Challenge 2019 Division 1(2019-08-12 15:00:00)

Global Rank:   922

Cheated in:   

Ratings System Update

(2019-08-12 15:00:00)

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

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1992 (+13)RatingProvisional
Rating i Provisional Rating, click to know more

August Challenge 2019 Division 1(2022-12-20 00:00:00)

Global Rank:   922

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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Practice Paths (0)

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Contests (25)

July Cook-Off 2014

Sum Queries, Copy-Paste

August Cook-Off 2014

Permutation Shuffle, Tree Game

October Cook-Off 2014

The Army, Walk on the Axis

November Cook-Off 2014

Brackets, Petersen Graph

August Challenge 2014

Chef and Reversing, Chef and Gift

November Challenge 2014

Chef and Segment Game, Chef and Words, Distinct Characters Subsequence, Chef and Red Black Tree, Let us construct palindrome

May Challenge 2015

Set Difference , Chef and new recipe

August Challenge 2015

Chef and insomnia, Aditi and Magic Trick, Cooking Machine, Gravity Guy, Way Out, Devu And Churu

September Challenge 2015

Chain of Doughnuts, Count Steps in Matrix, Lighthouses

November Challenge 2015

Chef and cakes, Eugene and function, Chef and collection of stamps, Ingredients

September Mega Cook-Off 2015

Reign 2, Forgotten Language, Super Numbers, Stacks

February Challenge 2016

Sereja and Two Lines, Chef and Strange Operations, Rectangles of Love, Chef-Detective

December Cook-Off 2016

Chef and Subset, Chef and Subarrays

July Lunchtime 2016

Drumpf for President!, Lumpy - The Bus Driver

January Challenge 2017

Capital Movement, Cats and Dogs, Chef and Circle, Digits Cannot Separate, Reservior

April Challenge 2017

Dish Of Life, Similar Dishes

March Cook-Off 2017

Rainbow Graph, Safe Robot

July Cook-Off 2017

Chang and Bitwise OR, Chang and the Perfect Function, Chang and Perfect Quadruples

August Lunchtime 2017

Mathison and the Dynamo shuffle, Mathison and pangrams

February Lunchtime 2018

Jumping in the hills, Game with numbers

February Challenge 2019 Division 1

Manhattan Rectangle, Guess It Right, Chef and Secret Ingredients, Art of Balance

June Challenge 2019 Division 1

Chef and Ingredients, Intersecting Paths, Sum and GCD

June Cook-Off 2019 Division 1

Ants and Anteaters, Drink Slush, Nice Subsets

June Lunchtime 2019 Division 1

The Grux Permutation , Gii and His Club, Igzi and Burly Array

July Challenge 2019 Division 1

Guess the Prime!, Codechef War, Circular Merging

August Challenge 2019 Division 1

Guddu and his Mother, Dilemma

Total Problems Solved: 102