Cody

# Problem 793. Combinations without using nchoosek

Solution 107211

Submitted on 6 Jul 2012 by Khaled Hamed
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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 output = your_fcn_name(n) for i=1:n-1 for j=i+1:n output((n-i/2)*(i-1)+j-i,:)=[i j]; end; end;end %This code written by profile_id 869884

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 output = your_fcn_name(n) for i=1:n-1 for j=i+1:n output((n-i/2)*(i-1)+j-i,:)=[i j]; end; end;end %This code written by profile_id 869884

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 output = your_fcn_name(n) for i=1:n-1 for j=i+1:n output((n-i/2)*(i-1)+j-i,:)=[i j]; end; end;end %This code written by profile_id 869884

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 output = your_fcn_name(n) for i=1:n-1 for j=i+1:n output((n-i/2)*(i-1)+j-i,:)=[i j]; end; end;end %This code written by profile_id 869884