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this answer doesn't match the expectation of this program well. This is a N-Subset problem, the number can be used repeatedly in different sub-sets.
- Haojian.Jin January 04, 2012Say,
input : {1,2,4,5,6,1,2,4,3,5,7,2,1} only three '2'
output : {1,1,2}, {2,2}, {3,1}, {1,2,1}... with four '2'.
I have a stupid solution, just calculate all the possible combinations first, then just track each possibility if this combination can be fulfilled.