The flood-fill algorithm is used to determine the area connected to a given node in a multi-dimensional array. This algorithm is used in the game Clicken Gold to determine which is used to find out what blocks should be cleared. It is also used in paint programs for filling in contiguous areas.
The MD5 hashing algorithm creates a one-way hash from any string (such as a password). So given the hash string the only way to get the original string is to do a dictionary attack.
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