How to resolve the algorithm Flatten a list step by step in the Mercury programming language

Published on 12 May 2024 09:40 PM
#Mercury

How to resolve the algorithm Flatten a list step by step in the Mercury programming language

Table of Contents

Problem Statement

Write a function to flatten the nesting in an arbitrary list of values. Your program should work on the equivalent of this list: Where the correct result would be the list:

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Flatten a list step by step in the Mercury programming language

Source code in the mercury programming language

:- module flatten_a_list.
:- interface.

:- import_module io.

:- pred main(io::di, io::uo) is det.

:- implementation.

:- import_module list.

:- type tree(T)
    --->    leaf(T)
    ;       node(list(tree(T))).

:- func flatten(tree(T)) = list(T).

flatten(leaf(X)) = [X].
flatten(node(Xs)) = condense(map(flatten, Xs)).

main(!IO) :-
    List = node([
        node([leaf(1)]),
        leaf(2),
        node([node([leaf(3), leaf(4)]), leaf(5)]),
        node([node([node([])])]),
        node([node([node([leaf(6)])])]),
        leaf(7),
        leaf(8),
        node([])
    ]),
    io.print_line(flatten(List), !IO).

:- end_module flatten_a_list.

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