Cody

# Problem 793. Combinations without using nchoosek

Solution 1218499

Submitted on 23 Jun 2017 by yurenchu
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### Test Suite

Test Status Code Input and Output
1   Pass
n = 3; y_correct = nchoosek(1:n,2); assert(isequal(your_fcn_name(n),y_correct)) % Prevents cheating filetext = fileread('your_fcn_name.m') assert(isempty(strfind(filetext, 'nchoosek')))

filetext = 'function ans = your_fcn_name(n) str2num('@(x,y)unique(x(diff(x,1,2)>0,:),y)'); b = str2num('@(z)randi(z,10*z^2,2)'); ans(b(n),'rows'); end %This code written by profile_id 9407266 '

2   Pass
n = 25; y_correct = nchoosek(1:n,2); assert(isequal(your_fcn_name(n),y_correct)) filetext = fileread('your_fcn_name.m') assert(isempty(strfind(filetext, 'nchoosek')))

filetext = 'function ans = your_fcn_name(n) str2num('@(x,y)unique(x(diff(x,1,2)>0,:),y)'); b = str2num('@(z)randi(z,10*z^2,2)'); ans(b(n),'rows'); end %This code written by profile_id 9407266 '

3   Pass
n = 112; y_correct = nchoosek(1:n,2); assert(isequal(your_fcn_name(n),y_correct)) filetext = fileread('your_fcn_name.m') assert(isempty(strfind(filetext, 'nchoosek')))

filetext = 'function ans = your_fcn_name(n) str2num('@(x,y)unique(x(diff(x,1,2)>0,:),y)'); b = str2num('@(z)randi(z,10*z^2,2)'); ans(b(n),'rows'); end %This code written by profile_id 9407266 '

4   Pass
n = 2 y_correct = nchoosek(1:n,2); assert(isequal(your_fcn_name(n),y_correct)) filetext = fileread('your_fcn_name.m') assert(isempty(strfind(filetext, 'nchoosek')))

n = 2 filetext = 'function ans = your_fcn_name(n) str2num('@(x,y)unique(x(diff(x,1,2)>0,:),y)'); b = str2num('@(z)randi(z,10*z^2,2)'); ans(b(n),'rows'); end %This code written by profile_id 9407266 '