unlucky_1¶

We’ll say that a 1 immediately followed by a 3 in a list is an “unlucky” 1. Return true if the given list contains an unlucky 1 in the first 2 or last 2 positions in the list.

This exercise was taken from codingbat.com and has been adapted for the Python language. There are many great programming exercises there, but the majority are created for Java.

Test 1¶

Input:

[1, 3, 4, 5]

Output:

True

Test 2¶

Input:

[2, 1, 3, 4, 5]

Output:

True

Test 3¶

Input:

[1, 1, 1]

Output:

False

Test 4¶

Input:

[1, 3, 1]

Output:

True

Test 5¶

Input:

[1, 1, 3]

Output:

True

Test 6¶

Input:

[1, 2, 3]

Output:

False

Test 7¶

Input:

[3, 3, 3]

Output:

False

Test 8¶

Input:

[1, 3]

Output:

True

Test 9¶

Input:

[1, 4]

Output:

False

Test 10¶

Input:

[1]

Output:

False

Test 11¶

Input:

[]

Output:

False

Test 12¶

Input:

[1, 1, 1, 3, 1]

Output:

False

Test 13¶

Input:

[1, 1, 3, 1, 1]

Output:

True

Test 14¶

Input:

[1, 1, 1, 1, 3]

Output:

True

Test 15¶

Input:

[1, 4, 1, 5]

Output:

False

Test 16¶

Input:

[1, 1, 2, 3]

Output:

False

Test 17¶

Input:

[2, 3, 2, 1]

Output:

False

Test 18¶

Input:

[2, 3, 1, 3]

Output:

True

Test 19¶

Input:

[1, 2, 3, 4, 1, 3]

Output:

True