Divide into two group

Правка en6, от tsminh_3, 2015-06-16 19:11:18 
Please help me with this 

Give n ropes, each rope in length a[i] (n<=10^3). Then divide them into two group
- Sum1 = sum of all ropes in group 1
- Sum2 = sum of all ropes in group 2 
The task asked if there is a way to divide them into two group which S1=S2`
Note : the numbers of rope in each group maybe not equal to the other

Sorry for my bad at English :(

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en6 Английский tsminh_3 2015-06-16 19:11:18 34 Tiny change: 'he other\n~~~~~\n\' -> 'he other\n\nSorry for my bad at English :(\n~~~~~\n\'
en5 Английский tsminh_3 2015-06-16 19:10:15 20
en4 Английский tsminh_3 2015-06-16 19:09:08 45 Tiny change: ' two group\n- Sum1 =' -
en3 Английский tsminh_3 2015-06-16 19:07:21 0 (published)
en2 Английский tsminh_3 2015-06-16 19:07:09 11 (saved to drafts)
en1 Английский tsminh_3 2015-06-16 19:06:14 362 Initial revision (published)