Volume 4 (400-499)

Problem ID Title Solution by Most Popular Input by
400 Unix ls
401 Palindromes
402 M*A*S*H
403 Postscript
404 Radar Scopes
405 Message Routing
406 Prime Cuts
407 Gears on a Board
408 Uniform Generator
409 Excuses, Excuses!
410 Station Balance
411 Centipede Collisions
412 Pi
413 Up and Down Sequences
414 Machined Surfaces
415 Sunrise
416 LED Test
417 Word Index
418 Molecules
419 Matching Meetings
420 Supercomputer Selection, The Sequel
421 Polygonal Puzzle
422 Word-Search Wonder
423 MPI Maelstrom
424 Integer Inquiry
425 Enigmatic Encryption
426 Fifth Bank of Swamp County
427 FlatLand Piano Movers
428 Swamp County Roofs
429 Word Transformation
430 Swamp County Supervisors
431 Trial of the Millennium
432 Modern Art
433 Bank (Not Quite O.C.R.)
434 Matty's Blocks
435 Block Voting
436 Arbitrage (II)
437 The Tower of Babylon
438 The Circumference of the Circle
439 Knight Moves
440 Eeny Meeny Moo
441 Lotto
442 Matrix Chain Multiplication
443 Humble Numbers
444 Encoder and Decoder
445 Marvelous Mazes
446 Kibbles "n" Bits "n" Bits "n" Bits
447 Population Explosion
448 OOPS!
449 Majoring in Scales
450 Little Black Book
451 Poker Solitaire Evaluator
452 Project Scheduling
453 Intersecting Circles
454 Anagrams
455 Periodic Strings
456 Robotic Stacker
457 Linear Cellular Automata
458 The Decoder
459 Graph Connectivity
460 Overlapping Rectangles (1)
461 The Reservation Maker
462 Bridge Hand Evaluator
463 Polynomial Factorization
464 Sentence/Phrase Generator
465 Overflow
466 Mirror, Mirror
467 Synching Signals
468 Key to Success
469 Wetlands of Florida
470 Nasty Virus
471 Magic Numbers
472 Simultaneous Equations
473 Raucous Rockers
474 Heads / Tails Probability
475 Wild Thing
476 Points in Figures: Rectangles
477 Points in Figures: Rectangles and Circles
478 Points in Figures: Rectangles, Circles, Triangles
479 Irrigation Flow Rates
480 Tempus Fugit
481 What Goes Up
482 Permutation Arrays
483 Word Scramble
484 The Department of Redundancy Department
485 Pascal's Triangle of Death
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486 English-Number Translator
487 Boggle Blitz
488 Triangle Wave
489 Hangman Judge
490 Rotating Sentences
491 Tile Topology
492 Pig-Latin
493 Rational Spiral
494 Kindergarten Counting Game
495 Fibonacci Freeze
496 Simply Subsets
497 Strategic Defense Initiative
498 Polly the Polynomial
499 What's The Frequency, Kenneth?