Ngoc Hai

• Username: 4★ngochai
• Country:  Vietnam
• Student/Professional:Student
• Institution:Ho Chi Minh City University of Science Vietnam
• CodeChef Pro Plan: No Active Plan. View Details

Submissions Heat Map

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

Rating Graph

No. of Contests Participated: 43

Current Ratings Graph Old Ratings Graph

1966 (-35)RatingProvisional
Rating i Provisional Rating, click to know more

Starters 65 Division 1 (Rated for 5 & 6 stars)(2022-11-16 23:00:00)

Global Rank:   151

Cheated in:   

Ratings System Update

(2022-11-16 23:00:00)

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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1966 (-5)RatingProvisional
Rating i Provisional Rating, click to know more

Starters 65 Division 1 (Rated for 5 & 6 stars)(2022-12-20 00:00:00)

Global Rank:   151

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 (43)

July Cook-Off 2014

Copy-Paste, Sum Queries

September Cook-Off 2014, ACM-ICPC Warm up

Subarray GCD

October Cook-Off 2014

The Army, Walk on the Axis

June Challenge 2014

Chef and Subarray, Guessing Game

July Challenge 2014

Little Elephant and Painting, Garden Game, Chef and Frogs, Chef and Rectangle Genome, Count Substrings, Reach The Point

August Challenge 2014

Chef and Reversing, The Leaking Robot, Cleaning Tables, Chef and Gift

September Challenge 2014

Factorisation, Chef and Rainbow Array - 2, Chef and Left-Right, Fun with Rotation

October Challenge 2014

Chef and Ground, DevuLand, Dinosaurs and Laddus

November Challenge 2014

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

December Challenge 2014

XOR with Subset, Chef and Apple Trees

June Lunchtime 2014

The Smallest Pair

August Lunchtime 2014

Harrenhal

October Lunchtime 2014

Tanu and Head-bob, Physics Class, Cascading Style Sheets

November Lunchtime 2014

A wolf, a sheep and cabbage

December Lunchtime 2014

Delivery Man, Sum Of Binomial Coefficent

January Challenge 2015

Chef and Stones, Sereja and Votes, One Dimensional Kingdoms, Gcd Queries

February Challenge 2015

Chef and Chain, Chef and Strange Formula, Chef and Strings, Let us play with rank list, Chef and Equality

March Challenge 2015

Chef and Notebooks, Sign Wave

April Challenge 2015

Count Sequences, Chef and Interview, Broken Telephone, Chef and Piano Scales

June Challenge 2015

Chef and His Friend, Chef and Memory Limit, Chef and Polygons

October Challenge 2015

Time measure, Count Subarrays, Who dares to be a millionaire, Spheres

February Cook-Off 2015

Fit Squares in Triangle

March Lunchtime 2015

Saving a gift of love, Chef Anup

February Challenge 2016

Chef and Strange Operations, Devu and a light discussion, Rectangles of Love, Chef-Detective

March Challenge 2016

Palindromic substrings, maximize the sum, Chef And Special Dishes

May Challenge 2016

Chef and Balls, Forest Gathering, Chef and Big Soccer, Laddu

September Challenge 2016

Chef and digits of a number, Faded Palindromes

December Challenge 2016

Train Partner

February Lunchtime 2016

Chef and Socks, Chef and Tic-Tac-Toe

April Lunchtime 2016

Maximum K Sums, Coins And Triangle

August Lunchtime 2016

Studying Alphabet, Lock-Free Stack

November Lunchtime 2016

Chef and his Students, Chef and Square Set, Tom & Jerry

May Challenge 2017

Chef and Sub Array , Chef and his daily routine, Courses in an university, Blocked websites, Median of adjacent maximum numbers, Chef and Subsequences

August Long Challenge 2017

Chef and Rainbow Array, Chef And Fibonacci Array, Chef and Mover, Palindromic Game, Greedy Candidates

September Challenge 2017

Sereja and Commands, Chef and Pick Digit, Minimum Good Permutation, Fill The Matrix, Little Chef and Sums

January Lunchtime 2018

Chef and Game with Sequence, Chef and Average on a Tree, Chef and Escaping from the Labyrinth

May Challenge 2018 Division 1

Change the Signs, Fake Binary Search, Dibs on Fibs

November Challenge 2018 Division 1

Appy Loves One, Good Median, Chef, Primes and Trees (Challenge), Magician versus Chef 2

October Challenge 2018 Division 1

Appy and Balloons , Beautiful Bricks, Minimize Digitsum, Chef and Surprise Chessboard

Starters 65 Division 1 (Rated for 5 & 6 stars)

Nahaane Jaa, Binod

Total Problems Solved: 160