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ecb5e4a9e6
tests/declarative_debugger/*.m:
tests/exceptions/*.m:
tests/general/*.m:
tests/grade_subdirs/*.m:
tests/purity/*.m:
tests/submodules/*.m:
tests/typeclasses/*.m:
Update programming style.
tests/declarative_debugger/*.inp:
Update line numbers in breakpoint commands.
tests/declarative_debugger/*.exp:
Update expected line numbers.
tests/exceptions/Mercury.options:
tests/general/Mercury.options:
Disable some warnings that are irrelevant to the test.
71 lines
1.7 KiB
Mathematica
71 lines
1.7 KiB
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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:- module dice.
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:- interface.
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:- import_module io.
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:- pred main(io::di, io::uo) is det.
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:- implementation.
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:- import_module exception.
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:- import_module library_forwarding.
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:- import_module list.
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:- import_module string.
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main(!IO) :-
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io.command_line_arguments(Args, !IO),
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( if list.map(string.to_int, Args, Ints) then
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merge_sort(Ints, Sorted),
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io.write_line(Sorted, !IO)
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else
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io.write_string("usage error\n", !IO)
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).
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:- pred merge_sort(list(int)::in, list(int)::out) is det.
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merge_sort(Us, Ss) :-
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N = list.length(Us),
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msort_n(N, Us, Ss, _).
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:- pred msort_n(int::in, list(int)::in, list(int)::out, list(int)::out) is det.
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msort_n(N, Unsorted, SortedPart, Rest) :-
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( if N =< 0 then
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SortedPart = [],
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Rest = Unsorted
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else if N = 1 then
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(
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Unsorted = [U | Us],
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SortedPart = [U],
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Rest = Us
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;
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Unsorted = [],
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throw("Unsorted = [] and N = 0")
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)
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else
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N1 = N // 2,
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dice.msort_n(N1, Unsorted, Ss1, Us2),
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N2 = N - N1,
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msort_n(N2, Us2, Ss2, Rest),
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dice.merge(Ss1, Ss2, SortedPart)
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).
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:- pred merge(list(int)::in, list(int)::in, list(int)::out) is det.
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merge([], [], []).
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merge([S | Ss], [], [S | Ss]).
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merge([], [S | Ss], [S | Ss]).
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merge([A | As], [B | Bs], [C | Cs]) :-
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( if A =< B then
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dice.merge(As, [B | Bs], Cs),
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C = A
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else
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dice.merge(As, [B | Bs], Cs), % BUG
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C = B
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).
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