Problem 43562. Mastermind

Created by Bert

Solve Later

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We are playing the boardgame mastermind <a href = "https://en.wikipedia.org/wiki/Mastermind_(board_game)">https://en.wikipedia.org/wiki/Mastermind_(board_game)</a>. 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]).The first guess (this will be [1 1 2 2]) is already done and the game master has given you following feedback:<ol><li>The number of correct characters in your guess, in this case 1 because character "1" at index 2 is correct.</li><li>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.</li></ol>Now, 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).It 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.Good luck!

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Last Solution submitted on May 24, 2023

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Are Mjaavatten on 17 Aug 2021

If the hidden code is [2 4 4 2] and the attempt is [1 2 3 5], then the test gives rightNumRightPlace = 0, rightNumWrongPlace = 2. I my head, rightNumWrongPlace should be 1. Have I misunderstood? .

Augusto Mazzei on 24 May 2023

I rate difficult-level this challenge because in your test case is not working correctly. Sometimes you pass [3right place 1wrong place] which is not possible. You should replace the way you calculate the RightNumWrongPlace.
This may fix things (it's also vectorized)

function [r w]=tellMe(sol, gues)

% this function calculates the score of the pegs given a solution
1x4 and a matrix of guesses nx4.

r = sum( sol==gues,2);
s = size(gues,1);
rows = repmat( (1:s)',1,4);
w = sum(min( accumarray(sol',1,[6 1])', accumarray( [rows(:) gues(:)],1,[s 6])),2)-r;
end

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Problem 43562. Mastermind

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