Dividing array into groups

Divide a list of numbers into groups of consecutive numbers but their original order should be preserved.

Example:
<8,2,4,7,1,0,3,6>

should be divided into two groups like this:
<2,4,1,0,3> <8,7,6>

Source : http://discuss.techinterview.org/default.asp?interview.11.770712.8

Sort on second key when, first key in a set is sorted

Assume that we are given as input n pairs of items, where

1. the first item is a number
2. the second item is one of three colors (red, blue, or yellow).

Further, assume that the items are sorted by number. Give an O(n) algorithm to sort the items by color (all reds before all blues before all yellows) such that the numbers for identical colors stay sorted.

For example: (1,blue), (3,red), (4,blue), (6,yellow), (9,red) should become (3,red), (9,red), (1,blue), (4,blue), (6,yellow).

Find if summation of numbers from two lists is given number

Problem: Given two lists A & B define an algo, which will identify two numbers 'a' and 'b', such that a + b = x, where 'x' is the input.

Wife?

Got this from a colleague of mine. Found it hilarious...