User HongyiSun

Points breakdown

100 / 100

AC | C++20

NOI '04 P1 - The Depressed Cashier

on March 15, 2026, 7:38 p.m.

20pp

weighted 100% (20pp)

100 / 100

AC | C++20

CCO Preparation Test 1 P3 - K-th Rank Student

on March 15, 2026, 7:16 p.m.

17pp

weighted 95% (16pp)

100 / 100

AC | C++20

MNYC '16: Rocks

on April 6, 2026, 6:13 p.m.

15pp

weighted 90% (14pp)

10 / 10

AC | C++20

A Fenwick Tree Question

on April 6, 2026, 1:20 a.m.

15pp

weighted 86% (13pp)

100 / 100

AC | C++20

COCI '15 Contest 2 #5 Vudu

on April 6, 2026, 12:31 a.m.

15pp

weighted 81% (12pp)

100 / 100

AC | C++20

DMOPC '19 Contest 6 P4 - Grade 12 Math

on March 17, 2026, 1:07 a.m.

15pp

weighted 77% (12pp)

110 / 110

AC | C++20

Binary Search Tree Test

on March 17, 2026, 1:06 a.m.

15pp

weighted 74% (11pp)

25 / 25

AC | C++20

CCO '10 P3 - Wowow

on March 15, 2026, 2:44 a.m.

15pp

weighted 70% (10pp)

25 / 25

AC | C++20

CCO '11 P2 - Vampire Tunnels

on Feb. 16, 2026, 3:53 p.m.

15pp

weighted 66% (10.0pp)

25 / 25

AC | C++20

CCO '14 P2 - King Gruff

on Feb. 14, 2026, 2:21 a.m.

15pp

weighted 63% (9.5pp)

Problem	Score
An Animal Contest 1 P1 - Alpaca Shapes	3 / 3
An Animal Contest 1 P4 - Alpaca Arrays	10 / 10
An Animal Contest 2 P0 - Koala Matchmaking	3 / 3
An Animal Contest 2 P4 - Koala Gambling	12 / 12
An Animal Contest 3 P1 - Monkey Shopping	3 / 3
An Animal Contest 3 P2 - Monkey Potato	5 / 5
An Animal Contest 5 P2 - Permutations & Products	5 / 5

Problem	Score
Another Contest 3 Problem 1 - Diverse Arrays	7 / 7
Another Contest 7 Problem 3 - Network Connections	10 / 10

Problem	Score
Baltic OI '07 P3 - Sound	10 / 10
Baltic OI '13 P5 - Tracks in the Snow	12 / 12

Problem	Score
CCC '00 S1 - Slot Machines	5 / 5
CCC '00 S3 - Surfing	7 / 7
CCC '01 S1 - Keeping Score	5 / 5
CCC '01 S3 - Strategic Bombing	7 / 7
CCC '01 S4 - Cookies	10 / 10
CCC '01 S5 - Post's Correspondence Problem	10 / 10
CCC '02 J2 - AmeriCanadian	3 / 3
CCC '02 S1 - The Students' Council Breakfast	5 / 5
CCC '02 S4 - Bridge Crossing	10 / 10
CCC '03 J2 - Picture Perfect	1.200 / 3
CCC '03 S1 - Snakes and Ladders	5 / 5
CCC '03 S2 - Poetry	5 / 5
CCC '03 S3 - Floor Plan	7 / 7
CCC '03 S5 - Trucking Troubles	10 / 10
CCC '04 J2 - Terms of Office	3 / 3
CCC '04 J3 - Smile with Similes	3 / 3
CCC '04 J4 - Simple Encryption	5 / 5
CCC '04 J5 - Fractals	10 / 10
CCC '04 S1 - Fix	5 / 5
CCC '04 S2 - TopYodeller	5 / 5
CCC '04 S3 - Spreadsheet	10 / 10
CCC '04 S5 - Super Plumber	10 / 10
CCC '05 J1 - The Cell Sell	3 / 3
CCC '05 J2 - RSA Numbers	3 / 3
CCC '05 J3 - Returning Home	5 / 5
CCC '05 J4 - Cross Spiral	7 / 7
CCC '05 J5 - Bananas	10 / 10
CCC '05 S1 - Snow Calls	5 / 5
CCC '05 S2 - Mouse Move	5 / 5
CCC '05 S3 - Quantum Operations	10 / 10
CCC '05 S4 - Pyramid Message Scheme	10 / 10
CCC '05 S5 - Pinball Ranking	12 / 12
CCC '06 J1 - Canadian Calorie Counting	3 / 3
CCC '06 J2 - Roll the Dice	3 / 3
CCC '06 J3 - Cell-Phone Messaging	3 / 3
CCC '06 J4 - It's tough being a teen!	7 / 7
CCC '06 J5 - CCC Othello	10 / 10
CCC '06 S1 - Maternity	3.333 / 5
CCC '06 S2 - Attack of the CipherTexts	2 / 5
CCC '06 S4 - Groups	10 / 10
CCC '06 S5 - Origin of Life	15 / 15
CCC '07 J1 - Who is in the Middle?	3 / 3
CCC '07 J2 - I Speak TXTMSG	3 / 3
CCC '07 J3 - Deal or No Deal Calculator	3 / 3
CCC '07 J4 - Anagram Checker	5 / 5
CCC '07 J5 - Keep on Truckin'	7 / 7
CCC '07 S1 - Federal Voting Age	3 / 3
CCC '07 S2 - Boxes	5 / 5
CCC '07 S3 - Friends	7 / 7
CCC '07 S5 - Bowling for Numbers	10 / 10
CCC '08 J1 - Body Mass Index	3 / 3
CCC '08 J2 - Do the Shuffle	3 / 3
CCC '08 J3 - GPS Text Entry	3 / 3
CCC '08 S1 - It's Cold Here!	3 / 3
CCC '08 S2 - Pennies in the Ring	5 / 5
CCC '08 S3 - Maze	7 / 7
CCC '08 S4 - Twenty-four	10 / 10
CCC '08 S5 - Nukit	10 / 10
CCC '09 J1 - ISBN	3 / 3
CCC '09 J2 - Old Fishin' Hole	5 / 5
CCC '09 J3 - Good Times	5 / 5
CCC '09 J4 - Signage	5 / 5
CCC '09 S1 - Cool Numbers	5 / 5
CCC '09 S2 - Lights Going On and Off	10 / 10
CCC '09 S3 - Degrees Of Separation	10 / 10
CCC '09 S4 - Shop and Ship	10 / 10
CCC '09 S5 - Wireless	12 / 12
CCC '10 J1 - What is n, Daddy?	3 / 3
CCC '10 J2 - Up and Down	5 / 5
CCC '10 J3 - Punchy	5 / 5
CCC '10 J4 - Global Warming	5 / 5
CCC '10 J5 - Knight Hop	7 / 7
CCC '10 S2 - Huffman Encoding	5 / 5
CCC '11 J1 - Which Alien?	3 / 3
CCC '11 J2 - Who Has Seen The Wind	5 / 5
CCC '11 J3 - Sumac Sequences	5 / 5
CCC '11 J4 - Boring Business	7 / 7
CCC '11 J5 - Unfriend	7 / 7
CCC '11 S1 - English or French?	5 / 5
CCC '11 S2 - Multiple Choice	3 / 3
CCC '11 S3 - Alice Through the Looking Glass	10 / 10
CCC '12 J1 - Speed fines are not fine!	3 / 3
CCC '12 J2 - Sounds fishy!	3 / 3
CCC '12 J3 - Icon Scaling	3 / 3
CCC '12 J4 - Big Bang Secrets	3 / 3
CCC '12 S2 - Aromatic Numbers	5 / 5
CCC '12 S3 - Absolutely Acidic	7 / 7
CCC '13 J1 - Next in line	3 / 3
CCC '13 J2 - Rotating letters	3 / 3
CCC '13 J4 - Time on task	5 / 5
CCC '13 S1 - From 1987 to 2013	5 / 5
CCC '13 S2 - Bridge Transport	5 / 5
CCC '13 S3 - Chances of Winning	10 / 10
CCC '13 S4 - Who is Taller?	7 / 7
CCC '14 J1 - Triangle Times	3 / 3
CCC '14 J2 - Vote Count	3 / 3
CCC '14 J3 - Double Dice	3 / 3
CCC '14 S1 - Party Invitation	5 / 5
CCC '14 S2 - Assigning Partners	5 / 5
CCC '14 S3 - The Geneva Confection	7 / 7
CCC '15 J1 - Special Day	3 / 3
CCC '15 J2 - Happy or Sad	3 / 3
CCC '15 J3 - Rövarspråket	5 / 5
CCC '15 J4 - Wait Time	5 / 5
CCC '15 J5 - π-day	10 / 10
CCC '15 S1 - Zero That Out	3 / 3
CCC '15 S2 - Jerseys	5 / 5
CCC '15 S3 - Gates	10 / 10
CCC '16 J1 - Tournament Selection	3 / 3
CCC '16 J2 - Magic Squares	3 / 3
CCC '16 J3 - Hidden Palindrome	5 / 5
CCC '16 J4 - Arrival Time	5 / 5
CCC '16 S2 - Tandem Bicycle	5 / 5
CCC '17 J1 - Quadrant Selection	3 / 3
CCC '17 J2 - Shifty Sum	3 / 3
CCC '17 J3 - Exactly Electrical	3 / 3
CCC '17 J4 - Favourite Times	5 / 5
CCC '17 S2 - High Tide, Low Tide	5 / 5
CCC '17 S3 - Nailed It!	7 / 7
CCC '18 J1 - Telemarketer or not?	3 / 3
CCC '18 J2 - Occupy parking	3 / 3
CCC '18 J3 - Are we there yet?	3 / 3
CCC '18 J5 - Choose your own path	7 / 7
CCC '18 S2 - Sunflowers	5 / 5
CCC '18 S3 - RoboThieves	10 / 10
CCC '19 J1 - Winning Score	3 / 3
CCC '19 J2 - Time to Decompress	3 / 3
CCC '19 J3 - Cold Compress	5 / 5
CCC '19 S1 - Flipper	3 / 3
CCC '19 S2 - Pretty Average Primes	5 / 5
CCC '20 J1 - Dog Treats	3 / 3
CCC '20 J2 - Epidemiology	3 / 3
CCC '20 J3 - Art	3 / 3
CCC '20 J4 - Cyclic Shifts	5 / 5
CCC '20 S2 - Escape Room	10 / 10
CCC '21 J1 - Boiling Water	3 / 3
CCC '21 J2 - Silent Auction	3 / 3
CCC '21 J3 - Secret Instructions	5 / 5
CCC '21 J4 - Arranging Books	7 / 7
CCC '21 S2 - Modern Art	7 / 7
CCC '21 S3 - Lunch Concert	10 / 10
CCC '22 J1 - Cupcake Party	3 / 3
CCC '22 J2 - Fergusonball Ratings	3 / 3
CCC '22 J3 - Harp Tuning	5 / 5
CCC '22 J5 - Square Pool	10 / 10
CCC '22 S3 - Good Samples	10 / 10
CCC '23 J1 - Deliv-e-droid	3 / 3
CCC '23 J2 - Chili Peppers	3 / 3
CCC '23 J3 - Special Event	5 / 5
CCC '23 J5 - CCC Word Hunt	10 / 10
CCC '23 S1 - Trianglane	5 / 5
CCC '23 S3 - Palindromic Poster	10 / 10
CCC '24 J1 - Conveyor Belt Sushi	3 / 3
CCC '24 J2 - Dusa And The Yobis	3 / 3
CCC '24 J3 - Bronze Count	5 / 5
CCC '24 J4 - Troublesome Keys	7 / 7
CCC '24 J5 - Harvest Waterloo	7 / 7
CCC '24 S3 - Swipe	10 / 10
CCC '96 S4 - When in Rome	10 / 10
CCC '96 S5 - Maximum Distance	7 / 7
CCC '97 S1 - Sentences	5 / 5

Problem	Score
CCO '01 P1 - The Monkey Dance	10 / 10
CCO '05 P5 - Segments	10 / 10
CCO '07 P2 - Snowflakes	10 / 10
CCO '10 P3 - Wowow	15 / 15
CCO '10 P4 - Computer Purchase Return	10 / 10
CCO '11 P2 - Vampire Tunnels	15 / 15
CCO '14 P1 - Troyangles	10 / 10
CCO '14 P2 - King Gruff	15 / 15
CCO '15 P4 - Cars on Ice	10 / 10
CCO '16 P4 - O Canada	10 / 10
CCO '18 P1 - Geese vs. Hawks	10 / 10
CCO '99 P2 - Common Words	10 / 10

User HongyiSun

Points breakdown

AAC (41 points)

ACC (17 points)

Baltic OI (22 points)

CCC (909.533 points)

CCO (135 points)

China NOI (20 points)

Classics (15 points)

COCI (242 points)

Data Structure Tests (35 points)

DMOPC (341 points)

DWITE (92 points)

ECOO (10 points)

FHC (10 points)

GFSSOC (25 points)

IOI (50 points)

Mock CCC (24 points)

Mock CCO (17 points)

MWC (10 points)

Olympiads School (15 points)

SAC Coding Challenge (32 points)

Seasonal (76 points)

SIUCF (5 points)

TLE (15 points)

TSOC (7 points)

Uncategorized (345 points)

VM7WC (60 points)

Woburn Challenge (21 points)

YAC (12 points)

Problem	Score
COCI '06 Contest 1 #2 Herman	5 / 5
COCI '06 Contest 1 #4 Slikar	10 / 10
COCI '06 Contest 2 #4 Sjecišta	7 / 7
COCI '07 Contest 4 #4 Muzicari	10 / 10
COCI '07 Contest 5 #3 Jabuke	7 / 7
COCI '07 Contest 6 #1 Parking	5 / 5
COCI '07 Contest 6 #2 Semafori	7 / 7
COCI '08 Contest 2 #3 Perket	7 / 7
COCI '08 Contest 3 #1 Pet	5 / 5
COCI '09 Contest 1 #2 Domino	5 / 5
COCI '09 Contest 6 #2 Natjecanje	5 / 5
COCI '10 Contest 3 #5 Diferencija	12 / 12
COCI '12 Contest 4 #2 Esej	5 / 5
COCI '13 Contest 3 #1 Riječi	5 / 5
COCI '13 Contest 4 #2 Gmo	5 / 5
COCI '14 Contest 1 #1 Prosjek	5 / 5
COCI '14 Contest 2 #2 Utrka	5 / 5
COCI '15 Contest 2 #2 Geppetto	7 / 7
COCI '15 Contest 2 #3 Artur	10 / 10
COCI '15 Contest 2 #5 Vudu	15 / 15
COCI '15 Contest 5 #3 Perica	10 / 10
COCI '15 Contest 5 #4 Poplava	12 / 12
COCI '16 Contest 1 #2 Jetpack	7 / 7
COCI '16 Contest 2 #3 Nizin	10 / 10
COCI '16 Contest 5 #2 Pareto	5 / 5
COCI '16 Contest 6 #2 Telefoni	5 / 5
COCI '17 Contest 2 #2 ZigZag	5 / 5
COCI '18 Contest 4 #2 Wand	7 / 7
COCI '19 Contest 3 #1 Preokret	5 / 5
COCI '21 Contest 6 #3 Naboj	10 / 10
COCI '06 Regional #1 Bard	7 / 7
COCI '06 Regional #3 Firefly	10 / 10
COCI '07 Regional #1 Platforme	7 / 7

Problem	Score
Binary Indexed Tree Test	10 / 10
Disjoint Set Test	10 / 10
Binary Search Tree Test	15 / 15

Problem	Score
DMOPC '13 Contest 3 P3 - Crossing Field	7 / 7
DMOPC '13 Contest 3 P5 - A Romantic Dinner	10 / 10
DMOPC '14 Contest 1 P3 - New Students	3 / 3
DMOPC '14 Contest 2 P4 - Deforestation	7 / 7
DMOPC '14 Contest 2 P5 - Sawmill Scheme	10 / 10
DMOPC '14 Contest 2 P6 - Selective Cutting	12 / 12
DMOPC '14 Contest 3 P4 - Not Enough Testers!	10 / 10
DMOPC '14 Contest 3 P6 - Not Enough Time!	10 / 10
DMOPC '14 Contest 4 P6 - Save Nagato!	10 / 10
DMOPC '14 Contest 7 P2 - Tides	5 / 5
DMOPC '15 Contest 1 P2 - Itami and Squad	5 / 5
DMOPC '15 Contest 1 P5 - Lelei and Dragon Scales	10 / 10
DMOPC '15 Contest 4 P2 - The Big Clock	5 / 5
DMOPC '15 Contest 4 P4 - Great Sequence	10 / 10
DMOPC '15 Contest 5 P4 - Steins;Number	12 / 12
DMOPC '15 Contest 6 P4 - Line Graph	10 / 10
DMOPC '15 Contest 6 P5 - A Classic Problem	10 / 10
DMOPC '16 Contest 4 P1 - Fast Exponents	5 / 5
DMOPC '16 Contest 4 P5 - Migrant Mascot	10 / 10
DMOPC '17 Contest 1 P2 - Sharing Crayons	7 / 7
DMOPC '17 Contest 2 P3 - Bad Bunnies	10 / 10
DMOPC '18 Contest 1 P1 - Sorting	5 / 5
DMOPC '18 Contest 2 P3 - Thanksgiving Feast	10 / 10
DMOPC '18 Contest 4 P4 - Dr. Henri and Lab Data	12 / 12
DMOPC '18 Contest 6 P3 - Wish Upon a Star	10 / 10
DMOPC '18 Contest 6 P4 - Tank	10 / 10
DMOPC '19 Contest 2 P3 - Selection	12 / 12
DMOPC '19 Contest 3 P1 - Mode Finding	5 / 5
DMOPC '19 Contest 4 P1 - Valid Strings	5 / 5
DMOPC '19 Contest 6 P4 - Grade 12 Math	15 / 15
DMOPC '19 Contest 7 P0 - Contest Feedback	3 / 3
DMOPC '20 Contest 1 P2 - Victor's Moral Dilemma	5 / 5
DMOPC '20 Contest 2 P3 - Roadrollification	10 / 10
DMOPC '20 Contest 4 P3 - Roving Roombas	12 / 12
DMOPC '21 Contest 5 P1 - Permutations & Primes	5 / 5
DMOPC '21 Contest 9 P2 - String Puzzle	7 / 7
DMOPC '22 Contest 2 P3 - Good Permutations	12 / 12
DMPG '17 S2 - Anime Conventions	10 / 10
DMPG '18 G1 - Musical Chairs	10 / 10
DMPG '19 S1 - Candy Shop Tycoon	5 / 5

Problem	Score
DWITE '06 R5 #5 - Prime Palindromes	10 / 10
DWITE '07 R1 #5 - Velociraptor Maze	7 / 7
DWITE '07 R2 #3 - Floor Plan	7 / 7
DWITE '07 R2 #4 - All Is Balanced	5 / 5
DWITE '07 R3 #5 - Portals	7 / 7
DWITE '08 R2 #5 - Water damage	7 / 7
DWITE '08 R4 #3 - Secret party	7 / 7
DWITE '09 R1 #2 - Word Scrambler	5 / 5
DWITE '09 R1 #3 - That Missing Number	5 / 5
DWITE '09 R7 #5 - Snapper Chain	10 / 10
DWITE '10 R3 #3 - Dominos Tiling	10 / 10
DWITE '10 R4 #4 - Mountain Hiking	7 / 7
DWITE '12 R1 #4 - Trick or Tree'ing	5 / 5

Problem	Score
GFSSOC '14 Winter J5 - Pursuit of Knowledge	10 / 10
GFSSOC '15 Fall J5 - Nightmare-a-thon	10 / 10
GFSSOC '15 Fall Practice P3 - Bruno and Beads	5 / 5

Problem	Score
IOI '00 P1 - Palindrome	10 / 10
IOI '04 P4 - Phidias	10 / 10
IOI '09 P4 - Raisins	10 / 10
IOI '09 P6 - Mecho	10 / 10
IOI '96 P1 - A Game	10 / 10

Problem	Score
Mock CCC '20 Contest 2 S2 - 4D BBST on a DP	5 / 5
Mock CCC '14 S3 - Spreadsheet Sorting	7 / 7
Mock CCC '18 Contest 5 J4/S2 - Reverse Sort	5 / 5
Mock CCC '18 Contest 5 J5/S3 - Directed Graph Connectivity	7 / 7

Problem	Score
SAC '21 Code Challenge P4 - Averaging Averages	5 / 5
SAC '22 Code Challenge 2 P5 - Even Colouring	10 / 10
SAC '22 Code Challenge 3 P2 - Unicycle License	5 / 5
SAC '22 Code Challenge 5 Junior P3 - Media List	5 / 5
SAC '22 Code Challenge 5 Junior P4 - Course Requirements	7 / 7

Problem	Score
Back From Summer '17 P2: Crayola Lightsaber	7 / 7
Back To School '17: Avalon	5 / 5
Back To School '17: Wet Mud	10 / 10
Back To School '18: Letter Frequency	7 / 7
Canada Day Contest 2021 - CCC Bad Haha	12 / 12
MEC '16 P3 - Getting Good at Programming	10 / 10
Miracle Sort	3 / 3
MNYC '16: Rocks	15 / 15
Is it a Tree?	7 / 7

Problem	Score
TLE '16 Contest 4 P1 - Stack of Presents	5 / 5
TLE '16 Contest 6 (Mock CCC) S1 - Writing the CCC	5 / 5
TLE '17 Contest 2 P2 - Unlucky Numbers	5 / 5

Problem	Score
Triple Fat Ladies	5 / 5
Appleby Contest '19 P3 - A Recursion Problem	5 / 5
Appleby Contest '19 P5 - Matrix Operation	10 / 10
Arcadia Computing Contest 2 P5 - lp0 is on fire!	10 / 10
A Plus B	3 / 3
Adding Reversed Numbers	5 / 5
The Cake is a Dessert	10 / 10
Checkerboard Summation (Easy)	12 / 12
Chocolate Bar	5 / 5
A Game	10 / 10
Counting Subsequences	10 / 10
Educational DP Contest AtCoder A - Frog 1	7 / 7
Educational DP Contest AtCoder G - Longest Path	10 / 10
Educational DP Contest AtCoder I - Coins	10 / 10
Educational DP Contest AtCoder K - Stones	10 / 10
Educational DP Contest AtCoder L - Deque	10 / 10
PEG Test '11 - Cyclopian Cash	3 / 3
PEG Test '11 - Cyclopian Puzzle	10 / 10
Troubling Triangles	7 / 7
Graph Contest 2 P2 - Directed Acyclic Graph	10 / 10
Graph Contest 3 P2 - Shortest Path	10 / 10
HCI '16 - Ulam Spiral	5 / 5
Hello, World!	3 / 3
Word Scrambler	5 / 5
Knapsack 3	10 / 10
Linked List	12 / 20
A Math Contest P2 - Subsequence Sum	5 / 5
OCC '19 S2 - Rimuru's Number Game	5 / 5
The Mirror	5 / 5
The Third Cellar	10 / 10
Postfix Notation	7 / 7
Primes	3 / 3
Rat In A Maze	5 / 5
RGPC '17 P4 - Snow Day	10 / 10
RGPC '18 P3 - Chocolate Day	10 / 10
Sleigh Ride	10 / 10
Bubble Sort	7 / 7
STNBD P3 - Rinslet Laurenfrost	5 / 5
Segment Tree Practice 1	12 / 12
Sum Maximization	10 / 10
THICC '17 P2 - Molly and Product	7 / 7
Tropical Bananas	10 / 10
UTS Open '21 P2 - Prime Array	10 / 10
Valentine's Day '19 S2 - Ctudor's Cute Cacti	7 / 7

Problem	Score
VMSS '15 #2 - Tomb Robbing	7 / 7
VMSS '15 #4 - Frank and Roads	10 / 10
VM7WC '15 #4 Gold - Chain Rule	10 / 10
VM7WC '15 #5 Bronze - Melanioana	3 / 3
VM7WC '16 #2 Silver - GG	5 / 5
VM7WC '16 #3 Silver - Can Shahir even get there?!	5 / 5
VM7WC '16 #3 Gold - Hello, Officer.	10 / 10
VM7WC '16 #4 Gold - Restoring Reputation	10 / 10

Problem	Score
WC '15 Contest 4 J2 - Mission Briefing	3 / 3
WC '16 Contest 1 J1 - A Spooky Season	3 / 3
WC '16 Finals J2 - Enigmoo	5 / 5
WC '18 Contest 4 S1 - World of StarCraft	10 / 10

Problem	Score
Yet Another Contest 1 P3 - Fluke	2 / 10
Yet Another Contest 7 P2 - Coprime Grid	10 / 10