16 October 2010

ACM UVA OJ Problems Category by Difficulty Level

Difficulty- 0.5

272 TEX Quotes 0.5 Ad Hoc
http://acm.uva.es/p/v2/272.html
458 The Decoder 0.5 Ad Hoc
http://acm.uva.es/p/v4/458.html
10071 Back to High School Physics 0.5 Math (Physics)
http://acm.uva.es/p/v100/10071.html
10300 Ecological Premium 0.5 Ad Hoc
http://acm.uva.es/p/v103/10300.html
10302 Summation of Polynomials 0.5 Math
http://acm.uva.es/p/v103/10302.html

Difficulty-1.0

299 Train Swapping 1.0 Sorting
http://acm.uva.es/p/v2/299.html
10023 Square root 1.0 Ad Hoc
http://acm.uva.es/p/v100/10023.html
10696 f91 1.0 Ad Hoc
http://acm.uva.es/p/v106/10696.html
10783 Odd Sum 1.0 Math
http://acm.uva.es/p/v107/10783.html

Difficulty-1.5

146 ID Codes 1.5 Ad Hoc
http://acm.uva.es/p/v1/146.html
541 Error Correction 1.5 Ad Hoc
http://acm.uva.es/p/v5/541.html
591 Box of Bricks 1.5 Ad Hoc
http://acm.uva.es/p/v5/591.html
10286 Trouble with a Pentagon 1.5 Math (Trigonometry)
http://acm.uva.es/p/v102/10286.html
10327 Flip Sort 1.5 Sorting (Bubble Sort)
http://acm.uva.es/p/v103/10327.html
10370 Above Average 1.5 Math
http://acm.uva.es/p/v103/10370.html
10656 Maximum Sum (II) 1.5 Ad Hoc
http://acm.uva.es/p/v106/10656.html
Grado de Dificultad – 2.0
113 Power of Cryptography 2.0 Math
http://acm.uva.es/p/v1/113.html
445 Marvelous Mazes 2.0 Ad Hoc
http://acm.uva.es/p/v4/445.html
494 Kindergarten Counting Game 2.0 Ad Hoc
http://acm.uva.es/p/v4/494.html
499 What’s The Frequency, Kenneth? 2.0 Ad Hoc
http://acm.uva.es/p/v4/499.html
10008 What’s Cryptanalysis? 2.0 Ad Hoc
http://acm.uva.es/p/v100/10008.html
10469 To Carry or not to Carry 2.0 Math
http://acm.uva.es/p/v104/10469.html
10784 Diagonal 2.0 Math
http://acm.uva.es/p/v107/10784.html

Grado de Dificultad – 2.5
100 The 3n + 1 Problem 2.5 Ad Hoc
http://acm.uva.es/p/v1/100.html
102 Ecological Bin Packing 2.5 Ad Hoc
http://acm.uva.es/p/v1/102.html
256 Quirksome Squares 2.5 Math
http://acm.uva.es/p/v2/256.html
382 Perfection 2.5 Math
http://acm.uva.es/p/v3/382.html
488 Triangle Wave 2.5 Ad Hoc
http://acm.uva.es/p/v4/488.html
579 Clock Hands 2.5 Ad Hoc
http://acm.uva.es/p/v5/579.html
621 Secret Research 2.5 Ad Hoc
http://acm.uva.es/p/v6/621.html
10018 Reverse and Add 2.5 Math
http://acm.uva.es/p/v100/10018.html
10035 Primary Arithmetic 2.5 Math
http://acm.uva.es/p/v100/10035.html
10038 Jolly Jumpers 2.5 Ad Hoc
http://acm.uva.es/p/v100/10038.html
10062 Tell me the frequencies! 2.5 Ad Hoc
http://acm.uva.es/p/v100/10062.html
10077 The Stern-Brocot Number System 2.5 Binary Search
http://acm.uva.es/p/v100/10077.html
10223 How many nodes ? 2.5 Math
http://acm.uva.es/p/v102/10223.html
10297 Beavergnaw 2.5 Math
http://acm.uva.es/p/v102/10297.html
10344 23 Out of 5 2.5 Backtracking
http://acm.uva.es/p/v103/10344.html
10346 Peter’s Smoke 2.5 Math
http://acm.uva.es/p/v103/10346.html
10361 Automatic Poetry 2.5 String Processing
http://acm.uva.es/p/v103/10361.html
10377 Maze Traversal 2.5 Simulation
http://acm.uva.es/p/v103/10377.html
10420 List of Conquests 2.5 Ad Hoc
http://acm.uva.es/p/v104/10420.html
10432 Polygon Inside A Circle 2.5 Math (Geometry)
http://acm.uva.es/p/v104/10432.html
10499 The Land of Justice 2.5 Math
http://acm.uva.es/p/v104/10499.html
10703 Free spots 2.5 Ad Hoc
http://acm.uva.es/p/v107/10703.html
10812 Beat the Spread! 2.5 Math
http://acm.uva.es/p/v108/10812.html

Grado de Dificultad – 3.0
142 Mouse Clicks 3.0 Ad Hoc
http://acm.uva.es/p/v1/142.html
155 All Squares 3.0 Backtracking
http://acm.uva.es/p/v1/155.html
356 Square Pegs And Round Holes 3.0 Math (Geometry)
http://acm.uva.es/p/v3/356.html
362 18,000 Seconds Remaining 3.0 Simulation
http://acm.uva.es/p/v3/362.html
371 Ackermann Functions 3.0 Math (3n+1)
http://acm.uva.es/p/v3/371.html
414 Machined Surfaces 3.0 Ad Hoc
http://acm.uva.es/p/v4/414.html
438 The Circumference Of The Circle 3.0 Math
http://acm.uva.es/p/v4/438.html
441 Lotto 3.0 Ad Hoc
http://acm.uva.es/p/v4/441.html
476 Points in Figures: Rectangles 3.0 Math (Computational Geometry)
http://acm.uva.es/p/v4/476.html
484 The Department of Redundancy Department 3.0 Ad Hoc
http://acm.uva.es/p/v4/484.html
514 Rails 3.0 Ad Hoc
http://acm.uva.es/p/v5/514.html
516 Prime Land 3.0 Math (Prime Number)
http://acm.uva.es/p/v5/516.html
587 There’s treasure everywhere! 3.0 Ad Hoc
http://acm.uva.es/p/v5/587.html
673 Parentheses Balance 3.0 Ad Hoc
http://acm.uva.es/p/v6/673.html
834 Continued Fractions 3.0 Math
http://acm.uva.es/p/v8/834.html
10041 Vito’s Family 3.0 Ad Hoc
http://acm.uva.es/p/v100/10041.html
10050 Hartals 3.0 Ad Hoc
http://acm.uva.es/p/v100/10050.html
10055 Hashmat the Brave Warrior 3.0 Math
http://acm.uva.es/p/v100/10055.html
10107 What is the Median? 3.0 Math
http://acm.uva.es/p/v101/10107.html
10141 Request for Proposal 3.0 Ad Hoc
http://acm.uva.es/p/v101/10141.html
10161 Ant on a Chessboard 3.0 Ad Hoc
http://acm.uva.es/p/v101/10161.html
10205 Stack ‘em Up 3.0 Ad Hoc
http://acm.uva.es/p/v102/10205.html
10222 Decode the Mad man 3.0 Ad Hoc
http://acm.uva.es/p/v102/10222.html
10281 Average Speed 3.0 Ad Hoc
http://acm.uva.es/p/v102/10281.html
10295 Hay Points 3.0 Sorting + Binary Search
http://acm.uva.es/p/v102/10295.html
10365 Blocks 3.0 Math
http://acm.uva.es/p/v103/10365.html
10409 Die Game 3.0 Ad Hoc
http://acm.uva.es/p/v104/10409.html
10415 Eb Alto Saxophone Player 3.0 Simulation
http://acm.uva.es/p/v104/10415.html
10451 Ancient Village Sports 3.0 Math
http://acm.uva.es/p/v104/10451.html
10490 Mr. Azad and his Son!!!!! 3.0 Ad Hoc
http://acm.uva.es/p/v104/10490.html
10530 Guessing Game 3.0 Simulation
http://acm.uva.es/p/v105/10530.html
10550 Combination Lock 3.0 Ad Hoc
http://acm.uva.es/p/v105/10550.html
10642 Can You Solve It? 3.0 Math
http://acm.uva.es/p/v106/10642.html
10699 Count the factors 3.0 Math (Prime Factors)
http://acm.uva.es/p/v106/10699.html
10789 Prime Frequency 3.0 String + Math (Prime)
http://acm.uva.es/p/v107/10789.html
10813 Traditional BINGO 3.0 Ad Hoc
http://acm.uva.es/p/v108/10813.html

Grado de Dificultad – 3.5
154 Recycling 3.5 Ad Hoc
http://acm.uva.es/p/v1/154.html
291 The House Of Santa Claus 3.5 Backtracking
http://acm.uva.es/p/v2/291.html
333 Recognizing Good ISBNs 3.5 Simulation
http://acm.uva.es/p/v3/333.html
340 Master-Mind Hints 3.5 Simulation
http://acm.uva.es/p/v3/340.html
440 Eeny Meeny Moo 3.5 Simulation
http://acm.uva.es/p/v4/440.html
477 Points in Figures: Rectangles and Circles 3.5 Math (Computational Geometry)
http://acm.uva.es/p/v4/477.html
482 Permutation Array 3.5 Ad Hoc
http://acm.uva.es/p/v4/482.html
492 Pig Latin 3.5 Ad Hoc
http://acm.uva.es/p/v4/492.html
498 Polly The Polynomial 3.5 Math
http://acm.uva.es/p/v4/498.html
556 Amazing 3.5 Simulation
http://acm.uva.es/p/v5/556.html
572 Oil Deposits 3.5 Graph (Flood Fill)
http://acm.uva.es/p/v5/572.html
573 The Snail 3.5 Ad Hoc
http://acm.uva.es/p/v5/573.html
575 Skew Binary 3.5 Ad Hoc
http://acm.uva.es/p/v5/575.html
583 Prime Factors 3.5 Math (Prime Number)
http://acm.uva.es/p/v5/583.html
594 One Little, Two Little, Three Little Endians 3.5 Ad Hoc
http://acm.uva.es/p/v5/594.html
661 Blowing Fuses 3.5 Ad Hoc
http://acm.uva.es/p/v6/661.html
694 The Collatz Sequence 3.5 Ad Hoc
http://acm.uva.es/p/v6/694.html
713 Adding Reversed Numbers 3.5 Ad Hoc
http://acm.uva.es/p/v7/713.html
847 A multiplication game 3.5 Math
http://acm.uva.es/p/v8/847.html
10106 Product 3.5 Math
http://acm.uva.es/p/v101/10106.html
10115 Automatic Editing 3.5 Ad Hoc
http://acm.uva.es/p/v101/10115.html
10189 Minesweeper 3.5 Ad Hoc
http://acm.uva.es/p/v101/10189.html
10195 The Knights Of The Round Table 3.5 Math
http://acm.uva.es/p/v101/10195.html
10242 Fourth Point!! 3.5 Math (Computational Geometry)
http://acm.uva.es/p/v102/10242.html
10252 Common Permutation 3.5 Ad Hoc
http://acm.uva.es/p/v102/10252.html
10279 Mine Sweeper 3.5 Ad Hoc
http://acm.uva.es/p/v102/10279.html
10285 Longest Run on the Snowboard 3.5 Backtracking
http://acm.uva.es/p/v102/10285.html
10293 Word Length and Frequency 3.5 Ad Hoc
http://acm.uva.es/p/v102/10293.html
10323 Factorial! You Must be Kidding!!! 3.5 Math (Factorial)
http://acm.uva.es/p/v103/10323.html
10336 Rank the Languages 3.5 Graph (Flood Fill)
http://acm.uva.es/p/v103/10336.html
10340 All in All 3.5 String Processing + Greedy
http://acm.uva.es/p/v103/10340.html
10363 Tic Tac Toe 3.5 Ad Hoc
http://acm.uva.es/p/v103/10363.html
10450 World Cup Noise 3.5 Math (Fibonacci)
http://acm.uva.es/p/v104/10450.html
10466 How Far? 3.5 Math (Trigonometry)
http://acm.uva.es/p/v104/10466.html
10474 Where is the Marble? 3.5 Sorting + Binary Search
http://acm.uva.es/p/v104/10474.html
10489 Boxes of Chocolates 3.5 Math (Modulo)
http://acm.uva.es/p/v104/10489.html
10502 Counting Rectangles 3.5 Ad Hoc
http://acm.uva.es/p/v105/10502.html
10509 R U Kidding Mr. Feynman? 3.5 Math
http://acm.uva.es/p/v105/10509.html
10515 Power et al. 3.5 Math
http://acm.uva.es/p/v105/10515.html
10586 Polynomial Remains 3.5 Math
http://acm.uva.es/p/v105/10586.html
10633 Rare Easy Problem 3.5 Math
http://acm.uva.es/p/v106/10633.html
10646 What is the Card? 3.5 Simulation
http://acm.uva.es/p/v106/10646.html
10677 Base Equality 3.5 Math
http://acm.uva.es/p/v106/10677.html
10678 The Grazing Cows 3.5 Math (Computational Geometry)
http://acm.uva.es/p/v106/10678.html
10706 Number Sequence 3.5 Math
http://acm.uva.es/p/v107/10706.html
10714 Ants 3.5 Ad Hoc
http://acm.uva.es/p/v107/10714.html
10719 Quotient Polynomial 3.5 Ad Hoc
http://acm.uva.es/p/v107/10719.html

Grado de Dificultad – 4.0
105 The Skyline Problem 4.0 Ad Hoc
http://acm.uva.es/p/v1/105.html
136 Ugly Numbers 4.0 DP
http://acm.uva.es/p/v1/136.html
156 Ananagram 4.0 Anagram
http://acm.uva.es/p/v1/156.html
161 Traffic Lights 4.0 Ad Hoc
http://acm.uva.es/p/v1/161.html
170 Clock Patience 4.0 Simulation
http://acm.uva.es/p/v1/170.html
188 Perfect Hash 4.0 Ad Hoc
http://acm.uva.es/p/v1/188.html
260 Il Gioco dell’X 4.0 Graph (FloodFill)
http://acm.uva.es/p/v2/260.html
263 Number Chains 4.0 Simulation
http://acm.uva.es/p/v2/263.html
264 Count on Cantor 4.0 Math
http://acm.uva.es/p/v2/264.html
280 Vertex 4.0 Graph
http://acm.uva.es/p/v2/280.html
341 Non-Stop Travel 4.0 Floyd Warshall
http://acm.uva.es/p/v3/341.html
344 Roman Digititis 4.0 Math (Roman Number)
http://acm.uva.es/p/v3/344.html
350 Pseudo-Random Numbers 4.0 Math
http://acm.uva.es/p/v3/350.html
352 The Seasonal War 4.0 Graph (Flood Fill)
http://acm.uva.es/p/v3/352.html
353 Pesky Palindromes 4.0 Ad Hoc
http://acm.uva.es/p/v3/353.html
374 Big Mod 4.0 Math (Modulo)
http://acm.uva.es/p/v3/374.html
379 HI-Q 4.0 Simulation
http://acm.uva.es/p/v3/379.html
386 Perfect Cubes 4.0 Math
http://acm.uva.es/p/v3/386.html
394 Mapmaker 4.0 Ad Hoc
http://acm.uva.es/p/v3/394.html
413 Up And Down Sequences 4.0 Ad Hoc
http://acm.uva.es/p/v4/413.html
447 Population Explosion 4.0 Simulation
http://acm.uva.es/p/v4/447.html
448 OOPS! 4.0 Ad Hoc
http://acm.uva.es/p/v4/448.html
450 Little Black Book 4.0 Ad Hoc
http://acm.uva.es/p/v4/450.html
457 Linear Cellular Automata 4.0 Simulation
http://acm.uva.es/p/v4/457.html
465 Overflow 4.0 Math
http://acm.uva.es/p/v4/465.html
468 Key To Success 4.0 Ad Hoc
http://acm.uva.es/p/v4/468.html
474 Heads / Tails Probability 4.0 Math
http://acm.uva.es/p/v4/474.html
483 Word Scramble 4.0 Ad Hoc
http://acm.uva.es/p/v4/483.html
489 Hangman Judge 4.0 Ad Hoc
http://acm.uva.es/p/v4/489.html
490 Rotating Sentences 4.0 Ad Hoc
http://acm.uva.es/p/v4/490.html
496 Simply Subsets 4.0 Ad Hoc
http://acm.uva.es/p/v4/496.html
537 Artificial Intelligence? 4.0 Ad Hoc
http://acm.uva.es/p/v5/537.html
538 Balancing Bank Accounts 4.0 Ad Hoc
http://acm.uva.es/p/v5/538.html
539 The Settlers of Catan 4.0 Backtracking
http://acm.uva.es/p/v5/539.html
543 Goldbach’s Conjecture 4.0 Math (Prime Number)
http://acm.uva.es/p/v5/543.html
567 Risk 4.0 Floyd Warshall
http://acm.uva.es/p/v5/567.html
576 Haiku Review 4.0 Ad Hoc
http://acm.uva.es/p/v5/576.html
580 Critical Mass 4.0 Math (Number Theory)
http://acm.uva.es/p/v5/580.html
598 Bundling Newspapers 4.0 Backtracking
http://acm.uva.es/p/v5/598.html
608 Counterfeit Dollar 4.0 Ad Hoc
http://acm.uva.es/p/v6/608.html
612 DNA Sorting 4.0 Sorting
http://acm.uva.es/p/v6/612.html
620 Cellular Structure 4.0 Backtracking
http://acm.uva.es/p/v6/620.html
626 Ecosystem 4.0 Ad Hoc
http://acm.uva.es/p/v6/626.html
641 Do the Untwist 4.0 Ad Hoc
http://acm.uva.es/p/v6/641.html
654 Ratio 4.0 Ad Hoc
http://acm.uva.es/p/v6/654.html
665 False Coin 4.0 Ad Hoc
http://acm.uva.es/p/v6/665.html
671 Spell checker 4.0 Ad Hoc
http://acm.uva.es/p/v6/671.html
686 Goldbach’s Conjecture (II) 4.0 Math (Prime Number)
http://acm.uva.es/p/v6/686.html
725 Division 4.0 Math
http://acm.uva.es/p/v7/725.html
727 Equation 4.0 Math
http://acm.uva.es/p/v7/727.html
776 Monkeys in a Regular Forest 4.0 Graph (Flood Fill)
http://acm.uva.es/p/v7/776.html
793 Network Connections 4.0 Set (Union-Find)
http://acm.uva.es/p/v7/793.html
833 Water Falls 4.0 Math (Computational Geometry)
http://acm.uva.es/p/v8/833.html
837 Light and Transparencies 4.0 Ad hoc
http://acm.uva.es/p/v8/837.html
855 Lunch in Grid City 4.0 Sorting + Median
http://acm.uva.es/p/v8/855.html
10014 Simple calculations 4.0 Math
http://acm.uva.es/p/v100/10014.html
10033 Interpreter 4.0 Simulation
http://acm.uva.es/p/v100/10033.html
10042 Smith Numbers 4.0 Math
http://acm.uva.es/p/v100/10042.html
10066 The Twin Towers 4.0 DP (LCS)
http://acm.uva.es/p/v100/10066.html
10074 Take The Land 4.0 DP
http://acm.uva.es/p/v100/10074.html
10079 Pizza Cutting 4.0 Math
http://acm.uva.es/p/v100/10079.html
10082 WERTYU 4.0 Output-related
http://acm.uva.es/p/v100/10082.html
10110 Light, more light 4.0 Math
http://acm.uva.es/p/v101/10110.html
10116 Robot Motion 4.0 Graph
http://acm.uva.es/p/v101/10116.html
10152 ShellSort 4.0 Sorting
http://acm.uva.es/p/v101/10152.html
10182 Bee Maja 4.0 Ad Hoc
http://acm.uva.es/p/v101/10182.html
10188 Automated Judge Script 4.0 String
http://acm.uva.es/p/v101/10188.html
10190 Divide, But Not Quite Conquer! 4.0 Math
http://acm.uva.es/p/v101/10190.html
10191 Longest Nap 4.0 Ad Hoc
http://acm.uva.es/p/v101/10191.html
10193 All You Need Is Love 4.0 Ad Hoc
http://acm.uva.es/p/v101/10193.html
10197 Learning Portuguese 4.0 Simulation
http://acm.uva.es/p/v101/10197.html
10203 Snow Clearing 4.0 Math
http://acm.uva.es/p/v102/10203.html
10260 Soundex 4.0 Ad Hoc
http://acm.uva.es/p/v102/10260.html
10276 Hanoi Tower Troubles Again! 4.0 Backtracking
http://acm.uva.es/p/v102/10276.html
10282 Babelfish 4.0 Sorting
http://acm.uva.es/p/v102/10282.html
10298 Power Strings 4.0 Ad Hoc
http://acm.uva.es/p/v102/10298.html
10301 Rings and Glue 4.0 Math (Geometry) + Backtracking
http://acm.uva.es/p/v103/10301.html
10305 Ordering Tasks 4.0 Ad Hoc
http://acm.uva.es/p/v103/10305.html
10338 Mischievous Children 4.0 Math (Factorial)
http://acm.uva.es/p/v103/10338.html
10360 Rat Attack 4.0 Ad Hoc
http://acm.uva.es/p/v103/10360.html
10371 Time Zones 4.0 Ad hoc
http://acm.uva.es/p/v103/10371.html
10393 The One-Handed Typist 4.0 Ad Hoc
http://acm.uva.es/p/v103/10393.html
10394 Twin Primes 4.0 Math (Prime Number)
http://acm.uva.es/p/v103/10394.html
10408 Farey sequences 4.0 Math (GCD) + Sorting
http://acm.uva.es/p/v104/10408.html
10422 Knights in FEN 4.0 Backtracking
http://acm.uva.es/p/v104/10422.html
10424 Love Calculator 4.0 Ad Hoc
http://acm.uva.es/p/v104/10424.html
10443 Rock, Scissors, Paper 4.0 Ad Hoc
http://acm.uva.es/p/v104/10443.html
10452 Marcus, help! 4.0 Graph Traversal
http://acm.uva.es/p/v104/10452.html
10473 Simple Base Conversion 4.0 Math (Base Number)
http://acm.uva.es/p/v104/10473.html
10487 Closest Sums 4.0 Simulation
http://acm.uva.es/p/v104/10487.html
10496 Collecting Beepers 4.0 Backtracking
http://acm.uva.es/p/v104/10496.html
10500 Robot maps 4.0 Simulation
http://acm.uva.es/p/v105/10500.html
10503 The dominoes solitaire 4.0 Backtracking
http://acm.uva.es/p/v105/10503.html
10508 Word Morphing 4.0 Ad Hoc
http://acm.uva.es/p/v105/10508.html
10528 Major Scales 4.0 Ad Hoc
http://acm.uva.es/p/v105/10528.html
10551 Basic Remains 4.0 Math (Base Number + Modulo)
http://acm.uva.es/p/v105/10551.html
10573 Geometry Paradox 4.0 Math (Geometry)
http://acm.uva.es/p/v105/10573.html
10583 Ubiquitous Religions 4.0 Set (Union-Find)
http://acm.uva.es/p/v105/10583.html
10589 Area 4.0 Math
http://acm.uva.es/p/v105/10589.html
10591 Happy Number 4.0 Simulation
http://acm.uva.es/p/v105/10591.html
10602 Editor Nottobad 4.0 Greedy
http://acm.uva.es/p/v106/10602.html
10608 Friends 4.0 Set (Union-Find)
http://acm.uva.es/p/v106/10608.html
10611 The Playboy Chimp 4.0 Binary Search
http://acm.uva.es/p/v106/10611.html
10620 A Flea on a Chessboard 4.0 Simulation
http://acm.uva.es/p/v106/10620.html
10651 Pebble Solitaire 4.0 Backtracking
http://acm.uva.es/p/v106/10651.html
10662 The Wedding 4.0 Ad Hoc
http://acm.uva.es/p/v106/10662.html
10664 Luggage 4.0 Backtracking
http://acm.uva.es/p/v106/10664.html
10667 Largest Block 4.0 DP
http://acm.uva.es/p/v106/10667.html
10684 The jackpot 4.0 DP (Maximum Interval Sum)
http://acm.uva.es/p/v106/10684.html
10701 Pre, in and post 4.0 Graph
http://acm.uva.es/p/v107/10701.html
10738 Riemann vs Mertens 4.0 Ad Hoc
http://acm.uva.es/p/v107/10738.html
10739 String to Palindrome 4.0 DP
http://acm.uva.es/p/v107/10739.html
10763 Foreign Exchange 4.0 Binary Search
http://acm.uva.es/p/v107/10763.html
10800 Not That Kind of Graph 4.0 String Processing
http://acm.uva.es/p/v108/10800.html
10803 Thunder Mountain 4.0 Graph (Shortest Path)
http://acm.uva.es/p/v108/10803.html

source: http://www.mail-archive.com/acm_una@googlegroups.com/msg00061.html

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