two_two¶

Given a list of ints, return true if every 2 that appears in the list is next to another 2.

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:

[4, 2, 2, 3]

Output:

True

Test 2¶

Input:

[2, 2, 4]

Output:

True

Test 3¶

Input:

[2, 2, 4, 2]

Output:

False

Test 4¶

Input:

[1, 3, 4]

Output:

True

Test 5¶

Input:

[1, 2, 2, 3, 4]

Output:

True

Test 6¶

Input:

[1, 2, 3, 4]

Output:

False

Test 7¶

Input:

[2, 2]

Output:

True

Test 8¶

Input:

[2, 2, 7]

Output:

True

Test 9¶

Input:

[2, 2, 7, 2, 1]

Output:

False

Test 10¶

Input:

[4, 2, 2, 2]

Output:

True

Test 11¶

Input:

[2, 2, 2]

Output:

True

Test 12¶

Input:

[1, 2]

Output:

False

Test 13¶

Input:

[2]

Output:

False

Test 14¶

Input:

[1]

Output:

True

Test 15¶

Input:

[]

Output:

True

Test 16¶

Input:

[5, 2, 2, 3]

Output:

True

Test 17¶

Input:

[2, 2, 5, 2]

Output:

False