Cody

Problem 1237. It's race time! Write a faster function than the test suite call of unique().

Solution 1658429

Submitted on 25 Oct 2018 by li haitao
This solution is locked. To view this solution, you need to provide a solution of the same size or smaller.
Solve This Problem View on Solution Map

Test Suite

Test Status Code Input and Output
1   Pass
x = rand(10000, 1); z = rand(10000, 1); x = vertcat(x, z); tic y_correct = unique(x); t_unique = toc tic y_myunique = my_unique(x); t_myunique = toc assert(isequal(sort(my_unique(x)),y_correct) && t_unique > t_myunique)

t_unique = 0.0072 t_myunique = 5.8000e-05
2   Pass
x = rand(50000, 1); z = rand(50000, 1); x = vertcat(x, z); tic y_correct = unique(x); t_unique = toc tic y_my_unique = my_unique(x); t_my_unique = toc assert(isequal(sort(my_unique(x)),y_correct) && t_unique > t_my_unique)

t_unique = 0.0115 t_my_unique = 3.7000e-05
3   Pass
x = [1; 2; 3; 4; 2; 3; 4; 5;]; tic y_correct = unique(x); t_unique = toc tic y_my_unique = my_unique(x); t_my_unique = toc assert(isequal(sort(my_unique(x)),y_correct) && t_unique > t_my_unique)

t_unique = 3.5700e-04 t_my_unique = 2.2100e-04

Suggested Problems

More from this Author7