CCC

This is a collection of my solution of Canadian Computing Competition (CCC). The solutions are mainly written in C++. Python solutions will be updated gradually.

Analysis

From 2021, I am adding a brief analysis for all problems for how to tackle the problem as a comment at the top of each source code file. Moreover, I am trying to make the variable name more readable, which will make my solution more understandable. I am gradually refactoring the solutions for previous year.

Contributing

Contribution on missing problems, wrong implementation, optimization, simpifying code, and develop a remarkable different solution are more than welcomed. Just send PR and I will be active. Thanks in advance!

Testing

DMOJ

DMOJ has a mirror of CCC grader's test cases on all CCC problems.

My Test Script

• Quick Usage

Suppose your source file and testing data folder is already on your disk, run the following command with Python 3.6+:

python test.py --src 2020/src/s4.cpp --data 2020/data/s4/ --lang cpp

• Full usage

See this post, it supports other advanced arguments and testing approach (compare with threshold, test harness file, etc.)

Grade

Here listed the grade judged by myself and DMOJ. Since I don't have a CCC online grader account, I am not able to test on that platform. However, it will be much appreciated to help me test my code on CCC online grader platform.

For Python code It is clearly stated on the CCC official website that the problem is not designed to get full mark on all languages even if an optimal solution is used, that is, for a scripting language like Python, it probably fail on some cases with large dataset. However, a fairly good standing (not heading to CCO or IOI) can still be achieved with pure Python.

2015

Problem #	Title	C++	Python	Notes
J1	Special Day	15/15
J2	Happy or Sad	15/15
J3	Rovarspraket	15/15
J4	Wait Time	15/15
J5	π-day	15/15
S1	Zero That Out	15/15
S2	Jerseys	15/15
S3	Gates	15/15
S4	Convex Hull	15/15
S5	Greedy For Pies	15/15

2016

Problem #	Title	C++	Python	Notes
J1	Tournament Selection	15/15
J2	Magic Squares	15/15
J3	Hidden Palindrome	15/15		An adv O(N) solution TBO
J4	Arrival Time	15/15
J5/S2	Tandem Bicycle	15/15
S1	Ragaman	15/15
S3	Phonomenal Reviews	15/15
S4	Combining Riceballs	15/15
S5	Circle of Life	15/15

2017

Problem #	Title	C++	Python	Notes
J1	Quadrant Selection	15/15
J2	Shifty Sum	15/15
J3	Exactly Electrical	15/15
J4	Favourite Times	15/15
J5/S3	Nailed It!	15/15
S1	Sum Game	15/15
S2	High Tide, Low Tide	15/15
S4	Minimum Cost Flow	15/15
S5	RMT	-/15		TBS

2018

Problem #	Title	C++	Python	Notes
J1	Telemarketer or not?	15/15
J2	Occupy parking	15/15
J3	Are we there yet?	15/15
J4/S2	Sunflowers	15/15
J5	Choose your own path	15/15
S1	Voronoi Villages	15/15
S3	RoboThieves	15/15
S4	Balanced Trees	15/15
S5	Maximum Strategic Savings	15/15

2019

Problem #	Title	C++	Python	Notes
J1	Winning Score	15/15
J2	Time to Decompress	15/15
J3	Cold Compress	15/15
J4/S1	Flipper	15/15
J5	Rule of Three	15/15		DMOJ additional data TLE (15/30)
S2	Pretty Average Primes	15/15
S3	Arithmetic Square	15/15
S4	Tourism	15/15
S5	Triangle: The Data Structure	15/15		See v2 for an O(N^2logK) sol to pass DMOJ

2020

Problem #	Title	C++	Python	Notes
J1	Dog Treats	15/15	15/15
J2	Epidemiology	15/15	15/15
J3	Art	15/15	15/15
J4	Cyclic Shifts	15/15	15/15
J5/S2	Escape Room	15/15	13/15
S1	Surmising a Sprinter’s Speed	15/15	15/15
S3	Searching for Strings	15/15	15/15
S4	Swapping Seats	15/15	8/15
S5	Josh’s Double Bacon Deluxe	15/15	15/15

2021

Problem #	Title	C++	Python	Notes
J1	Boiling Water	15/15
J2	Silent Auction	15/15
J3	Secret Instructions	15/15
J4	Arranging Books	15/15
J5/S2	Modern Art	15/15
S1	Crazy Fencing	15/15
S3	Lunch Concert	15/15
S4	Daily Commute	15/15
S5	Math Homework	15/15

** Notes: TBO: To be optimized
TBS: To be solved

Competitive Programming Resources

YouTube Channel

Some CP YouTuber whose video I am drowning in watching. Good skills will be learnt from their vids.

• William Lin
• Errichto