Cody

# Problem 793. Combinations without using nchoosek

Solution 267661

Submitted on 26 Jun 2013 by andrea84
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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 p= your_fcn_name(n) p=unique(sort(randi(n,100000,2),2),'rows'); p(diff(p,1,2)==0,:)=[]; end %This code written by profile_id 3803217 ```

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 p= your_fcn_name(n) p=unique(sort(randi(n,100000,2),2),'rows'); p(diff(p,1,2)==0,:)=[]; end %This code written by profile_id 3803217 ```

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 p= your_fcn_name(n) p=unique(sort(randi(n,100000,2),2),'rows'); p(diff(p,1,2)==0,:)=[]; end %This code written by profile_id 3803217 ```

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 p= your_fcn_name(n) p=unique(sort(randi(n,100000,2),2),'rows'); p(diff(p,1,2)==0,:)=[]; end %This code written by profile_id 3803217 ```