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How to count the number of subsequence in an array with 'and' operator sum equal to 0?
I have recently encountered this problem:
"Given an array a1, a2, ..., an, (1 ≤ n ≤ 105, 1 ≤ ai ≤ 106), count the number of subsequence ap1, ap2, ..., apk that ap1&ap2&...&apk = 0 (print the remain of division of that number by 109 + 7"
The best solution that I can come up is a dynamic programming solution that is not fast enough to solve this problem. How to solve this problem?
Thanks in advance.
| Rev. | Lang. | By | When | Δ | Comment | |
|---|---|---|---|---|---|---|
| en2 |
|
xuanquang1999 | 2017-01-01 16:13:12 | 237 | (published) | |
| en1 |
|
xuanquang1999 | 2017-01-01 16:03:48 | 321 | Initial revision (saved to drafts) |
