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Task/Flipping-bits-game/MATLAB/flipping-bits-game.m

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+function FlippingBitsGame(n)
+% Play the flipping bits game on an n x n array
+
+    % Generate random target array
+    fprintf('Welcome to the Flipping Bits Game!\n')
+    if nargin < 1
+        n = input('What dimension array should we use? ');
+    end
+    Tar = logical(randi([0 1], n));
+
+    % Generate starting array by randomly flipping rows or columns
+    Cur = Tar;
+    while all(Cur(:) == Tar(:))
+        nFlips = randi([3*n max(10*n, 100)]);
+        randDim = randi([0 1], nFlips, 1);
+        randIdx = randi([1 n], nFlips, 1);
+        for k = 1:nFlips
+            if randDim(k)
+                Cur(randIdx(k), :) = ~Cur(randIdx(k), :);
+            else
+                Cur(:, randIdx(k)) = ~Cur(:, randIdx(k));
+            end
+        end
+    end
+
+    % Print rules
+    fprintf('Given a %d x %d logical array,\n', n, n)
+    fprintf('and a target array configuration,\n')
+    fprintf('attempt to transform the array to the target\n')
+    fprintf('by inverting the bits in a whole row or column\n')
+    fprintf('at once in as few moves as possible.\n')
+    fprintf('Enter the corresponding letter to invert a column,\n')
+    fprintf('or the corresponding number to invert a row.\n')
+    fprintf('0 will reprint the target array, and no entry quits.\n\n')
+    fprintf('Target:\n')
+    PrintArray(Tar)
+
+    % Play until player wins or quits
+    move = true;
+    nMoves = 0;
+    while ~isempty(move) && any(Cur(:) ~= Tar(:))
+        fprintf('Move %d:\n', nMoves)
+        PrintArray(Cur)
+        move = lower(input('Enter move: ', 's'));
+        if length(move) > 1
+            fprintf('Invalid move, try again\n')
+        elseif move
+            r = str2double(move);
+            if isnan(r)
+                c = move-96;
+                if c > n || c < 1
+                    fprintf('Invalid move, try again\n')
+                else
+                    Cur(:, c) = ~Cur(:, c);
+                    nMoves = nMoves+1;
+                end
+            else
+                if r > n || r < 0
+                    fprintf('Invalid move, try again\n')
+                elseif r == 0
+                    fprintf('Target:\n')
+                    PrintArray(Tar)
+                else
+                    Cur(r, :) = ~Cur(r, :);
+                    nMoves = nMoves+1;
+                end
+            end
+        end
+    end
+
+    if all(Cur(:) == Tar(:))
+        fprintf('You win in %d moves! Try not to flip out!\n', nMoves)
+    else
+        fprintf('Quitting? The challenge a bit much for you?\n')
+    end
+end
+
+function PrintArray(A)
+    [nRows, nCols] = size(A);
+    fprintf('        ')
+    fprintf(' %c', (1:nCols)+96)
+    fprintf('\n')
+    for r = 1:nRows
+        fprintf('%8d%s\n', r, sprintf(' %d', A(r, :)))
+    end
+    fprintf('\n')
+end