Given an array find all the groups that make the sum equal to an integer given n.

Example

100,10,30,20,90,70,55,80,15,60,0
Sum=100

Possible ways are 100+0, 20+80,10+20+70,60+30+10,55+15+10+20...and so on..


Source http://max.cs.kzoo.edu/cs215/lectures/w5-graph-coloring.pdf
http://max.cs.kzoo.edu/cs215/lectures/w5-graph-coloring.pdf