{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2025-12-14T01:33:56.000Z","description":"Problems submitted by members of the MATLAB Central community.","is_default":true,"created_by":161519,"badge_id":null,"featured":false,"trending":false,"solution_count_in_trending_period":0,"trending_last_calculated":"2025-12-14T00:00:00.000Z","image_id":null,"published":true,"community_created":false,"status_id":2,"is_default_group_for_player":false,"deleted_by":null,"deleted_at":null,"restored_by":null,"restored_at":null,"description_opc":null,"description_html":null,"published_at":null},"problems":[{"id":43562,"title":"Mastermind","description":"We are playing the boardgame mastermind \u003chttps://en.wikipedia.org/wiki/Mastermind_(board_game)\u003e. The game master has created a 4-character code for you to guess, with characters ranging from \"1\" to \"6\" (e.g. code = [2 1 3 4]).\r\n\r\nThe first guess (this will be [1 1 2 2]) is already done and the game master has given you following feedback:\r\n\r\n# The number of correct characters in your guess, in this case 1 because character \"1\" at index 2 is correct.\r\n# The number of correct characters, but in a wrong place. In this case 1 because you guessed character \"2\", but it is in the wrong place.\r\n\r\nNow, your function has to do the next guesses. Each time your function is called, the input will contain the code and feedback of all your previous guesses, the output is a copy of the input with your new code added (refer to the example code).\r\n\r\nIt is shown you could solve the code in only 4 additional guesses (refer to the wiki page), you will however get 11 according to the rules of Mastermind.\r\n\r\nGood luck!","description_html":"\u003cp\u003eWe are playing the boardgame mastermind \u003ca href = \"https://en.wikipedia.org/wiki/Mastermind_(board_game)\"\u003ehttps://en.wikipedia.org/wiki/Mastermind_(board_game)\u003c/a\u003e. The game master has created a 4-character code for you to guess, with characters ranging from \"1\" to \"6\" (e.g. code = [2 1 3 4]).\u003c/p\u003e\u003cp\u003eThe first guess (this will be [1 1 2 2]) is already done and the game master has given you following feedback:\u003c/p\u003e\u003col\u003e\u003cli\u003eThe number of correct characters in your guess, in this case 1 because character \"1\" at index 2 is correct.\u003c/li\u003e\u003cli\u003eThe number of correct characters, but in a wrong place. In this case 1 because you guessed character \"2\", but it is in the wrong place.\u003c/li\u003e\u003c/ol\u003e\u003cp\u003eNow, your function has to do the next guesses. Each time your function is called, the input will contain the code and feedback of all your previous guesses, the output is a copy of the input with your new code added (refer to the example code).\u003c/p\u003e\u003cp\u003eIt is shown you could solve the code in only 4 additional guesses (refer to the wiki page), you will however get 11 according to the rules of Mastermind.\u003c/p\u003e\u003cp\u003eGood luck!\u003c/p\u003e","function_template":"function output = mastermind(input)\r\n    %% unpack the input (as example, alter if you like)\r\n    i = length(input);            % number of attempts so far\r\n    previousCode = input(i).code; % the last code you tried (at index i-1 you will find the code before that, etc.)\r\n    rightNumWrongPlace = input(i).rightNumWrongPlace; % the number of right numbers in previous attemp, but which were at the wrong place\r\n    rightNumRightPlace = input(i).rightNumRightPlace; % the number of right numbers in previous attemp at the wright position\r\n    % The user data from previous run (optional):\r\n    % Please use \"if isfield(...\", because your first call the user data\r\n    % will be empty\r\n    if isfield(input(i).userdata,'var2')\r\n        var2 = input(i).userdata.var2;\r\n    end\r\n    \r\n    %% now, based on previous attempts create your next code\r\n    yourCode = [1 1 1 1];\r\n    \r\n    %% alter if you like\r\n    % you can use the field userdata to save variables needed in your next run (optional)\r\n    data.var1 = 1;\r\n    data.var2 = 'lala';\r\n    new.userdata = data; \r\n    \r\n    %% do not alter\r\n    output = input;\r\n    new.code = yourCode;            % your next try\r\n    new.rightNumWrongPlace = [];    % the gamemaster will fill in this field at evaluation for the next attempt\r\n    new.rightNumRightPlace = [];   % the gamemaster will fill in this field at evaluation for the next attempt\r\n    if ~isfield(new,'userdata') % ensure no errors when userdata is not used\r\n        new.userdata = [];\r\n    end\r\n    output(end+1) = new;\r\nend","test_suite":"%%\r\ncode = randi(6,1,4); % the real code to crack\r\n% attempt 1\r\nattempts = [];\r\nattempts(1).code = [1 1 2 2]; % the first attempt\r\n% eval\r\nattempts(1).rightNumRightPlace = sum(code==attempts(1).code);\r\nattempts(1).rightNumWrongPlace = sum(sum(repmat(code',1,4)==repmat(attempts(1).code,4,1),2)\u003e0)-attempts(1).rightNumRightPlace;\r\nattempts(1).userdata = [];\r\n% init\r\nsolved = false;\r\nwhile (length(attempts)\u003c11 \u0026\u0026 ~solved)\r\n    attempts = mastermind(attempts);\r\n    % eval\r\n    attempts(end).rightNumRightPlace = sum(code==attempts(end).code);\r\n    attempts(end).rightNumWrongPlace = sum(sum(repmat(code',1,4)==repmat(attempts(end).code,4,1),2)\u003e0)-attempts(end).rightNumRightPlace;\r\n    if attempts(end).rightNumRightPlace==4\r\n        solved = true;\r\n    end\r\nend\r\nassert(solved)","published":true,"deleted":false,"likes_count":3,"comments_count":2,"created_by":94929,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":15,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2016-10-16T09:19:14.000Z","updated_at":"2025-12-12T14:00:01.000Z","published_at":"2016-10-16T09:19:14.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eWe are playing the boardgame mastermind\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"https://en.wikipedia.org/wiki/Mastermind_(board_game)\\\"\u003e\u003cw:r\u003e\u003cw:t\u003e\u0026lt;https://en.wikipedia.org/wiki/Mastermind_(board_game\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e)\u0026gt;. The game master has created a 4-character code for you to guess, with characters ranging from \\\"1\\\" to \\\"6\\\" (e.g. code = [2 1 3 4]).\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe first guess (this will be [1 1 2 2]) is already done and the game master has given you following feedback:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"2\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe number of correct characters in your guess, in this case 1 because character \\\"1\\\" at index 2 is correct.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"2\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe number of correct characters, but in a wrong place. In this case 1 because you guessed character \\\"2\\\", but it is in the wrong place.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eNow, your function has to do the next guesses. Each time your function is called, the input will contain the code and feedback of all your previous guesses, the output is a copy of the input with your new code added (refer to the example code).\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIt is shown you could solve the code in only 4 additional guesses (refer to the wiki page), you will however get 11 according to the rules of Mastermind.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eGood luck!\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"}],"problem_search":{"errors":[],"problems":[{"id":43562,"title":"Mastermind","description":"We are playing the boardgame mastermind \u003chttps://en.wikipedia.org/wiki/Mastermind_(board_game)\u003e. The game master has created a 4-character code for you to guess, with characters ranging from \"1\" to \"6\" (e.g. code = [2 1 3 4]).\r\n\r\nThe first guess (this will be [1 1 2 2]) is already done and the game master has given you following feedback:\r\n\r\n# The number of correct characters in your guess, in this case 1 because character \"1\" at index 2 is correct.\r\n# The number of correct characters, but in a wrong place. In this case 1 because you guessed character \"2\", but it is in the wrong place.\r\n\r\nNow, your function has to do the next guesses. Each time your function is called, the input will contain the code and feedback of all your previous guesses, the output is a copy of the input with your new code added (refer to the example code).\r\n\r\nIt is shown you could solve the code in only 4 additional guesses (refer to the wiki page), you will however get 11 according to the rules of Mastermind.\r\n\r\nGood luck!","description_html":"\u003cp\u003eWe are playing the boardgame mastermind \u003ca href = \"https://en.wikipedia.org/wiki/Mastermind_(board_game)\"\u003ehttps://en.wikipedia.org/wiki/Mastermind_(board_game)\u003c/a\u003e. The game master has created a 4-character code for you to guess, with characters ranging from \"1\" to \"6\" (e.g. code = [2 1 3 4]).\u003c/p\u003e\u003cp\u003eThe first guess (this will be [1 1 2 2]) is already done and the game master has given you following feedback:\u003c/p\u003e\u003col\u003e\u003cli\u003eThe number of correct characters in your guess, in this case 1 because character \"1\" at index 2 is correct.\u003c/li\u003e\u003cli\u003eThe number of correct characters, but in a wrong place. In this case 1 because you guessed character \"2\", but it is in the wrong place.\u003c/li\u003e\u003c/ol\u003e\u003cp\u003eNow, your function has to do the next guesses. Each time your function is called, the input will contain the code and feedback of all your previous guesses, the output is a copy of the input with your new code added (refer to the example code).\u003c/p\u003e\u003cp\u003eIt is shown you could solve the code in only 4 additional guesses (refer to the wiki page), you will however get 11 according to the rules of Mastermind.\u003c/p\u003e\u003cp\u003eGood luck!\u003c/p\u003e","function_template":"function output = mastermind(input)\r\n    %% unpack the input (as example, alter if you like)\r\n    i = length(input);            % number of attempts so far\r\n    previousCode = input(i).code; % the last code you tried (at index i-1 you will find the code before that, etc.)\r\n    rightNumWrongPlace = input(i).rightNumWrongPlace; % the number of right numbers in previous attemp, but which were at the wrong place\r\n    rightNumRightPlace = input(i).rightNumRightPlace; % the number of right numbers in previous attemp at the wright position\r\n    % The user data from previous run (optional):\r\n    % Please use \"if isfield(...\", because your first call the user data\r\n    % will be empty\r\n    if isfield(input(i).userdata,'var2')\r\n        var2 = input(i).userdata.var2;\r\n    end\r\n    \r\n    %% now, based on previous attempts create your next code\r\n    yourCode = [1 1 1 1];\r\n    \r\n    %% alter if you like\r\n    % you can use the field userdata to save variables needed in your next run (optional)\r\n    data.var1 = 1;\r\n    data.var2 = 'lala';\r\n    new.userdata = data; \r\n    \r\n    %% do not alter\r\n    output = input;\r\n    new.code = yourCode;            % your next try\r\n    new.rightNumWrongPlace = [];    % the gamemaster will fill in this field at evaluation for the next attempt\r\n    new.rightNumRightPlace = [];   % the gamemaster will fill in this field at evaluation for the next attempt\r\n    if ~isfield(new,'userdata') % ensure no errors when userdata is not used\r\n        new.userdata = [];\r\n    end\r\n    output(end+1) = new;\r\nend","test_suite":"%%\r\ncode = randi(6,1,4); % the real code to crack\r\n% attempt 1\r\nattempts = [];\r\nattempts(1).code = [1 1 2 2]; % the first attempt\r\n% eval\r\nattempts(1).rightNumRightPlace = sum(code==attempts(1).code);\r\nattempts(1).rightNumWrongPlace = sum(sum(repmat(code',1,4)==repmat(attempts(1).code,4,1),2)\u003e0)-attempts(1).rightNumRightPlace;\r\nattempts(1).userdata = [];\r\n% init\r\nsolved = false;\r\nwhile (length(attempts)\u003c11 \u0026\u0026 ~solved)\r\n    attempts = mastermind(attempts);\r\n    % eval\r\n    attempts(end).rightNumRightPlace = sum(code==attempts(end).code);\r\n    attempts(end).rightNumWrongPlace = sum(sum(repmat(code',1,4)==repmat(attempts(end).code,4,1),2)\u003e0)-attempts(end).rightNumRightPlace;\r\n    if attempts(end).rightNumRightPlace==4\r\n        solved = true;\r\n    end\r\nend\r\nassert(solved)","published":true,"deleted":false,"likes_count":3,"comments_count":2,"created_by":94929,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":15,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2016-10-16T09:19:14.000Z","updated_at":"2025-12-12T14:00:01.000Z","published_at":"2016-10-16T09:19:14.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eWe are playing the boardgame mastermind\u003c/w:t\u003e\u003c/w:r\u003e\u003cw:r\u003e\u003cw:t\u003e \u003c/w:t\u003e\u003c/w:r\u003e\u003cw:hyperlink w:docLocation=\\\"https://en.wikipedia.org/wiki/Mastermind_(board_game)\\\"\u003e\u003cw:r\u003e\u003cw:t\u003e\u0026lt;https://en.wikipedia.org/wiki/Mastermind_(board_game\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:hyperlink\u003e\u003cw:r\u003e\u003cw:t\u003e)\u0026gt;. The game master has created a 4-character code for you to guess, with characters ranging from \\\"1\\\" to \\\"6\\\" (e.g. code = [2 1 3 4]).\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe first guess (this will be [1 1 2 2]) is already done and the game master has given you following feedback:\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"2\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe number of correct characters in your guess, in this case 1 because character \\\"1\\\" at index 2 is correct.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"ListParagraph\\\"/\u003e\u003cw:numPr\u003e\u003cw:numId w:val=\\\"2\\\"/\u003e\u003c/w:numPr\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe number of correct characters, but in a wrong place. In this case 1 because you guessed character \\\"2\\\", but it is in the wrong place.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eNow, your function has to do the next guesses. Each time your function is called, the input will contain the code and feedback of all your previous guesses, the output is a copy of the input with your new code added (refer to the example code).\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eIt is shown you could solve the code in only 4 additional guesses (refer to the wiki page), you will however get 11 according to the rules of Mastermind.\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eGood luck!\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" 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