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「上と左の合計」をErlangで(横へな22) その2 ref: http://qiita.com/pazworld/items/03a9d342025961e6e9ff
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-module ( irrpas2 ). | |
-compile ( export_all ). | |
solve ( DataString ) -> | |
[ { Width, Height } | ConcatCells ] = parse_input_string ( DataString ), | |
TargetCellValueWithMemo = get_value ( Width - 1, Height - 1, ConcatCells, [] ), | |
get_right_two_digit ( element ( 1, TargetCellValueWithMemo ) ). | |
parse_input_string ( InputString ) -> | |
NumberStrings = string:tokens ( lists:delete ( $x, InputString ), ":," ), | |
[ list_to_tuple ( [ N - $0 || N <- M ] ) || M <- NumberStrings ]. | |
get_right_two_digit ( X ) -> string:right ( "0" ++ integer_to_list ( X ), 2 ). | |
get_value ( 0, 0, _ConcatCells, ValueMemo ) -> { 1, ValueMemo }; | |
get_value ( X, Y, _ConcatCells, ValueMemo ) when X < 0 orelse Y < 0 -> { 0, ValueMemo }; | |
get_value ( X, Y, ConcatCells, ValueMemo ) -> | |
{ NX, NY } = normalize_position ( X, Y, ConcatCells ), | |
case lists:keyfind ( { NX, NY }, 1, ValueMemo ) of | |
{ _XY, Value } -> { Value, ValueMemo }; | |
_Otherwise -> | |
LeftAndUpperCells = get_left_and_upper_cells ( NX, NY, ConcatCells ), | |
UniqueLeftAndUpperCells = lists:usort ( | |
[ normalize_position ( CX, CY, ConcatCells ) || { CX, CY } <- LeftAndUpperCells ] ), | |
SumCellValueFunction = get_sum_cell_value_function ( ConcatCells ), | |
lists:foldl ( SumCellValueFunction, { 0, ValueMemo }, UniqueLeftAndUpperCells ) | |
end. | |
get_sum_cell_value_function ( ConcatCells ) -> | |
fun ( { X, Y }, { SumValue, ValueMemo } ) -> | |
{ CellValue, ValueMemo2 } = get_value ( X, Y, ConcatCells, ValueMemo ), | |
{ SumValue + CellValue, [ { { X, Y }, CellValue } | ValueMemo2 ] } | |
end. | |
get_left_and_upper_cells ( X, Y, ConcatCells ) -> | |
IsInsideFunction = get_is_inside_function ( X, Y ), | |
case lists:filter ( IsInsideFunction, ConcatCells ) of | |
[ { _X, _Y, Width, Height } ] -> get_left_and_upper_cells ( X, Y, Width, Height ); | |
_Otherwise -> get_left_and_upper_cells ( X, Y, 1, 1 ) | |
end. | |
get_left_and_upper_cells ( X, Y, Width, Height ) -> | |
[ { X - 1, LeftCellY } || LeftCellY <- lists:seq ( Y, Y + Height - 1 )] ++ | |
[ { UpperCellX, Y - 1 } || UpperCellX <- lists:seq ( X, X + Width - 1 ) ]. | |
normalize_position ( X, Y, ConcatCells ) -> | |
IsInsideFunction = get_is_inside_function ( X, Y ), | |
case lists:filter ( IsInsideFunction, ConcatCells ) of | |
[ { FoundRangeX, FoundRangeY, _Width, _Height } ] -> { FoundRangeX, FoundRangeY }; | |
_Otherwise -> { X, Y } | |
end. | |
get_is_inside_function ( X, Y ) -> | |
fun ( { RangeX, RangeY, RangeWidth, RangeHeight } ) -> | |
RangeX =< X andalso X < RangeX + RangeWidth andalso | |
RangeY =< Y andalso Y < RangeY + RangeHeight | |
end. |
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