.- .-.. .

Years ago, I took a Programming Challenges course in college. The problems presented there were mostly designed to be solved by short algorithms. If you're looking for organized, well-structured code, try this other page instead.

If you came to this website looking for help regarding a specific problem, I'll be glad to show you my solution. However, please don't just copy my code. Be honest to yourself: use it to create your own solution. This is for your self-study.

I'm no longer into the programming challenges thing for quite some time now. Still, you might want to get a copy of the Programming Challenges Book. It's a valuable resource, and it helped me a lot.

ID	Problem name	Date	Source code
Lesson 1: Introduction
UVa 272	TeX Quotes	2009-02-17	tex.cpp
UVa 100	The 3n + 1 problem - hint	2009-02-17	3n_1.cpp
UVa 458	The Decoder	2009-02-17	decoder.cpp
Lesson 2: Introduction
UVa 10258	Contest Scoreboard - hint	2009-02-19	scoreboard.cpp
UVa 10104	Euclid Problem	2009-02-19	euclid.cpp
SPOJBR F91	f91	2009-02-19	f91.cpp
UVa 424	Integer Inquiry	2009-02-19	inquiry.cpp
UVa 10189	Minesweeper	2009-02-19	minesweeper.cpp
SPOJBR PLACAR	Quem vai ser reprovado	2009-02-19	reprovado.cpp
UVa 382	Perfection	2009-02-20	perfect.cpp
Lesson 3: Stacks
UVa 673	Parentheses Balance	2009-03-03	balance.cpp
UVa 732	Anagrams by Stack - hint	2009-03-05	anagram.cpp
UVa 514	Rails	2009-03-05	rails.cpp
Lesson 4: Queues
SPOJ ONP	Transform the Expression	2009-03-05	transform.cpp
SPOJBR NUMERDOS	Numero de Erdos - hint	2009-03-06	erdos.cpp
SPOJ EXPRESS	Expressions	2009-03-07	expressions.cpp
SPOJ HIKE	Hike on a Graph - hint	2009-03-09	hike.cpp
Lesson 5: Data Structures
UVa 540	Team Queue	2009-03-07	team_queue.cpp
UVa 10377	Maze Traversal	2009-03-10	maze.cpp
UVa 10142	Australian Voting	2009-03-11	australian.c
Lesson 6: Trees
UVa 536	Tree Recovery	2009-03-12	treerec.cpp
UVa 122	Trees on the level	2009-03-12	treelevel.cpp
UVa 112	Tree Summing	2009-03-14	treesum.cpp
Lesson 7: Trees
UVa 615	Is It A Tree?	2009-03-17	istree.cpp
UVa 10701	Pre, in and post	2009-03-17	preinpost.cpp
UVa 10308	Roads in the North	2009-03-22	roads.cpp
Lesson 8: Interval Trees / Range Minimum Query (RMQ)
SPOJBR SORVETE	Sorvete	2009-03-21	sorvete.cpp
SPOJ FREQUENT	Frequent Values - hint	2009-07-03	frequent.cpp
Lesson 9: Backtracking
SPOJBR JUNINA	Festa Junina	2009-04-01	junina.cpp
SPOJ WORDS1	Play on Words - hint	2009-04-06	words1.c
Lesson 10: Backtracking
SPOJ COMCB	Complete Chess Boards	2009-04-02	chess.cpp
SPOJBR DOMINO	Domino	2009-04-06	domino.cpp
SPOJ EUROPEAN	European railroad tracks	2009-04-07	european.cpp
Lesson 11: Backtracking
UVa 843	Crypt Kicker - hint	2009-04-14	crypt.cpp
UVa 861	Little Bishops	2009-04-19	bishop2.c
UVa 10160	Servicing Stations - hint	2009-04-26	servstat.cpp
Lesson 12: Backtracking
SPOJ SOLIT	Solitaire	2009-04-26	solit.cpp
UVa 10181	15-Puzzle Problem - hint	2009-05-18	15puzzle.cpp
SPOJ SOLIT	Solitaire (faster)	2009-05-18	solit2.c
Lesson 13: Sorting
UVa 612	DNA Sorting - hint	2009-04-23	dna.cpp
UVa 299	Train Swapping - hint	2009-04-23	train.cpp
UVa 10062	Tell me the frequencies	2009-04-24	tellfreq.cpp
UVa 10698	Football Sort	2009-04-25	football.cpp
UVa 120	Stacks of Flapjacks	2009-04-25	flapjack.cpp
Lesson 14 - Sorting
UVa 10905	Children's Game	2009-04-28	children.cpp
UVa 11057	Exact Sum	2009-04-28	exact.cpp
UVa 263	Number Chains	2009-04-28	chain.cpp
UVa 10810	Ultra-Quicksort - hint	2009-04-28	ultra.cpp
Lesson 15 - Arithmetic and Algebra
UVa 10018	Reverse and Add	2009-05-05	revadd.cpp
UVa 10077	The Stern-Brocot Number System - hint	2009-05-07	brocot.cpp
UVa 474	Heads/Tails Probability	2009-05-14	prob.cpp
UVa 701	The Archeologists' Dilemma	2009-05-14	arch.cpp
UVa 847	A Multiplication Game	2009-05-16	mulg.cpp
Lesson 16 - Combinatorics
UVa 10198	Counting - hint	2009-05-07	cnt.cpp
UVa 10254	The Priest Mathematician	2009-05-13	priest.cpp
UVa 846	Steps	2009-05-16	steps.cpp
Lesson 17 - Combinatorics
UVa 10784	Diagonal - hint	2009-05-16	diag.cpp
UVa 10219	Find the ways! - hint	2009-05-16	fways.cpp
UVa 10338	Mischiveous Children	2009-05-16	mchild.cpp
Lesson 18 - Dynamic Programming
UVa 10066	The Twin Towers	2009-06-02	twintowers.cpp
UVa 830	Biblioteca Otima	2009-06-05	bibo.c
UVa 10154	Weights and Measures - hint	2009-06-29	weme.cpp
Lesson 19 - Dynamic Programming
SPOJBR 1356	Parque Jurassico	2009-06-04	parque.c
UVa 10003	Cutting Sticks	2009-06-07	cstick.cpp
UVa 10271	Chopsticks	2009-06-27	chopsticks.cpp
SPOJBR 1758	Last Year at Marienbad	2009-06-30	marienba.cpp
Lesson 20 - Dynamic Programming
SPOJBR 2607	Campo de Minhocas	2009-06-09	minhoca.cpp
SPOJBR 1365	Palindrome	2009-06-28	palindrome.cpp
SPOJ 43	Copying Books	2009-07-01	cbook.cpp
UVa 10261	Ferry Loading - hint	2009-07-01	ferry.cpp
Lesson 21 - Miscellaneous / Graphs
UVa 10340	All in All	2009-06-18	allinall.cpp
UVa 10305	Ordering Tasks - hint	2009-06-18	ordtask.cpp
UVa 558	Wormholes	2009-06-18	wormhole.cpp
UVa 423	MPI Maelstrom	2009-06-27	mpi.cpp
UVa 200	Rare Order	2009-06-27	rareorder.cpp
UVa 10278	Fire Station	2009-06-28	firestation.cpp
UVa 10603	Fill - hint	2009-07-02	fill.cpp
TopCoder
ApplePie	TCHS18 - ApplePie	2009-04-07	tchs18_250.cpp
FrogDerby	TCHS18 - FrogDerby	2009-04-07	tchs18_500.cpp
WarehouseJob	TCHS18 - WarehouseJob	2009-04-07	tchs18_1000.cpp
DartThrow	TCHS19 - DartThrow	2009-04-07	tchs19_250.cpp
RubeGoldberg	TCHS19 - RubeGoldberg	2009-04-07	tchs19_1000.cpp
SalePitch	TCHS19 - SalePitch	2009-04-07	tchs19_500.cpp
Postnet	TCHS20 - Postnet	2009-05-05	tchs20_500.cpp
Surname	TCHS20 - Surname	2009-05-05	tchs20_250.cpp
Touchdown	TCHS20 - Touchdown	2009-05-05	tchs20_1000.cpp
HuffmanDecoding	SRM308 - HuffmanDecoding	2009-05-31	srm308_500.cpp
MedianOfNumbers	SRM308 - MedianOfNumbers	2009-05-31	srm308_250.cpp
TreasuresPacking	SRM308 - TreasuresPacking	2009-05-31	srm308_1000.cpp
Library	SRM384 - Library	2009-05-31	srm384_500.cpp
PowerGame	SRM384 - PowerGame	2009-05-31	srm384_1000.cpp
Prank	SRM384 - Prank	2009-05-31	srm384_250.cpp
GoodAndBadPostmen	TCHS30 - GoodAndBadPostmen	2009-06-25	tchs30_500.cpp
HowManyBirthdays	TCHS30 - HowManyBirthdays	2009-06-25	tchs30_250.cpp
FactoVisors	SRM406 - FactoVisors	2009-06-29	srm406_500.cpp
HappyCells	SRM406 - HappyCells	2009-06-30	srm406_250.cpp
AcidRain	TCHS30 - AcidRain	2009-07-01	tchs30_1000.cpp
PolygonColors	SRM406 - PolygonColors	2009-07-02	srm406_1000.cpp
Graph Algorithms
SPOJBR MESA	Mesa da Sra Montagny!	2009-02-25	ep1.c
SPOJBR ENERGIA	Transmissao de Energia	2009-03-08	ep2.c
SPOJBR PASSEIO	Passeio da bicicleta	2009-03-21	ep3.c
SPOJBR PREEMPOS	Pre, Em e Pos	2009-04-02	ep4.c
SPOJBR MANUT	Manutencao	2009-04-11	ep5.c
SPOJBR CHICAGO	106 miles to Chicago	2009-05-15	ep6.c
SPOJBR CIPO	Sistema Cipoviario	2009-06-03	ep7.c