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By K. Ribnikov

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Of course, the second solution is more efficient and we therefore wanted to support it in LEDA. We provide direct access through dic items. A dic item is the address of a dictionary container and can be stored in a dic item variable. The key and information stored in a dictionary container can be accessed directly through a dic item variable. , the potential to change information which is essential to the correct functioning of the underlying data structure? , the access to a key of a dictionary container is read-only.

2, and other people did, see for example [Ski98, Ski]. The comparisons show that our running times are competitive, despite the fact that LEDA is more like a decathlon athlete than a specialist for a particular discipline. 6 History We started the project in the fall of 1988. We spent the first six months on specifications and on selecting our implementation language. Our test cases were priority queues, dictionaries, partitions, and algorithms for shortest paths and minimum spanning trees. We came up with the item concept as an abstraction of the notion “pointer into a data structure”.

We give the following advice. Advice: Avoid assignment, initialization by copying, parameter passing by value, and 8 This assumes that both kinds of creations are defined for the type T . 34 Foundations function value return for non-primitive types. Also exercise care when using a non-primitive type as an actual type parameter. , a value of type stack E is a sequence of elements of type E, a value of type array E is a set of variables of type E indexed by an interval of integers, and a value of type list E is a sequence of list items each with an associated element of type E.

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