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it's Friday afternoon, let's have a fun puzzle/algorithm problem to solve. One of my favorite Nintendo DS games is Picross DS . The game is quite simple, it involves solving puzzles called Nonograms . You can try a simple online Picross clone here: TylerK's Picross . Nonograms are a grid, with sequences of numbers defined for every row and column of the grid. The numbers define blocks of "filled in" squares for that row/column, but the unfilled areas on either sides of the blocks are not defined. For example, if you have a row that looks like this: (source: steam-punk.net ) Possible solutions for that row would include: (source: steam-punk.net ) (source: steam-punk.net ) etc. The "4 5" simply tells you that, somewhere in the row, there are 4 sequential blocks filled in, followed by 5 sequential blocks filled in. Those will be the only blocks filled in, and the amount of space before/after them are not defined. A puzzle is complete when all rows and columns meet their definitions, without any contradictions. Ex

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