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An algorithm is a sequence of well-defined steps that defines an abstract solution to a problem. Use this tag when your issue is related to design and analysis of algorithms.

1 vote
1 answer
58 views

What algorithm can solve the conversion engine problem?

I was once asked a question, given a series of units and their ratios, such as inch, cm, gram vs pound, and a lot of potentially cryptic units and ratios, such as A, B, C, D, ... if I am given n times …
nonopolarity's user avatar
2 votes
2 answers
141 views

What algorithm may be used to solve the re-assembly of shredded papers?

I was once given this question in an interview: Suppose a piece of paper has 80 columns of alphabets with a fixed size font, and now the paper is shredded vertically, into 80 vertical pieces (so e …
nonopolarity's user avatar
0 votes
2 answers
50 views

Is destructuring a heap (taking down a heap) also O(n) like building a heap? If so, can the ...

If we can build up a heap with time O(n), can we take down a heap also by O(n)? (by delete-max repeatedly). Intuitively, it may feel it is, because it is like the reverse of build it up. (Building a …
nonopolarity's user avatar
0 votes

Is there a random shuffle algorithm using only true /false?

You actually can use true / false to simulate a Riffle Shuffle or Faro Shuffle: Start with the deck of cards on the middle Move half of the deck to the left, and half to the right Get a boolean: if …
nonopolarity's user avatar
19 votes
7 answers
6k views

Why do we use the number of compares to measure the time complexity when compare is quite ch...

With sorting or selection algorithms, for example, what if the number of comparisons can be O(n log n) or O(n), but then, other operations had to be O(n²) or O(n log n), then wouldn't the higher O() still …
nonopolarity's user avatar