kandi X-RAY | 1step Summary
kandi X-RAY | 1step Summary
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You provide 1 string:
a1, a2..an (a [i] <= 20)
Requirement: The minimum cost (number of steps) to swap any two elements in the sequence so that the final sequence obtained has equal values that lie in succession:
Each step you can only choose 2 adjacent values to swap: swap (a [i], a [i + 1]) = 1steps
ANSWERAnswered 2019-Nov-22 at 17:02
Note that since
A[i] <= 20 we can go ahead and enumerate every subset of all
A[i] and fit comfortably within any time constraints.
M be the number of unique
A[i], then there is a
O(NM + M * 2^M) dynamic programming solution with bitmasks.
note that when I say moving an
A[i] I mean moving every element with value
To understand how we do this let's first consider the brute force solution. We have some set of unique
A[i] moved to the front of the string, and then at each step we pick the next
A[i] to move behind what we had originally. This is
O(M! * N).
There's one important observation to be made here: if we have some set of
A[i] at the start of the string, and then we move the next one, the order of our original set of
A[i] doesn't actually matter. Any move will cost the same regardless of the order.
cost(subset, A[i]) be the cost of moving all
A[i] behind that subset of
A[i] at the front of the string. Then we can write the following:
I have a set of product descriptions from which i want to extract product attributes through regular expressions.
ANSWERAnswered 2019-Sep-16 at 08:14
To use regex for extracting information you need to be clear about the data pattern. From your sample set I guess that the pattern is "text preceded by G and a number" and a regex for that would look like that:
I'm running Python 2.7 on CentOS7.
The Flask route gets the data via request.get_json('data') and the dictionary is picked up by python because my console prints out the requested dictionary. I can access the dictionary, but I don't know why I get the typeError.
Here is my flask code:...
ANSWERAnswered 2019-Jul-12 at 15:52
Posting an answer as this doesn't fit in a comment.
According to the output, sometimes
request.get_json('data') returns a string (e.g. "chart").
I don't know why this happens, so I suggest going around the problem, by changing the function to:
While doing digital design in systemverilog, I ran into an issue regarding racing conditions.
The test-bench (which I cannot modify) that drives my design, drives the inputs in such a way that certain registers in the design do not function properly due to a race condition.
Here is an eda-playground example which illustrates what is happening (input changes "before" the clock does, at time 15ns):
Is there a way to make the design (a simple register in this case) resistant to this particular problem? What I need is a statement like "out_data <= preponed(in_data);" or something similar which will make the order of input signal changes irrelevant.
I have read about #1step in the SystemVerilog LRM but I am unsure how to use it, nor if it can help me with this particular problem at all....
ANSWERAnswered 2017-Aug-29 at 14:41
Your test bench is essentially creating stimulus that is in a setup violation to your register. You have two options:
- Convince the testbench writer of their erroneous ways and get them to fix it.
- Insert a layer of hierarchy around the design that delays the clock to eliminate the race.
Can someone give me a hint as to why this interface with modports and clocking blocks might not work?...
ANSWERAnswered 2017-Jan-22 at 16:23
Your understanding is not correct. Adding a clocking block to a modport only gives you access to the signals created by the clocking block, not the signals it references.
When using clocking block signals you need to reference the clocking block scope, i.e.
AXIS_MST.cb_axis_mst.tvalid_m. And instead of
@posedge AXIS_MST.aclk, just use
One other comment about your testbench: remove the nested
program/endprogram statements; they serve no purpose. Do not use program blocks.
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