StackOverflow2013

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PO
primarykey
Id
15965876
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
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CreationDate
2013-04-12T07:50:56.387
FavoriteCount
0
LastActivityDate
2013-04-12T08:04:12.787
LastEditDate
2013-04-12T08:04:12.787
LastEditorUserId
347964
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347964
ParentId
15965328
PostTypeId
2
Score
0
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0
LastEditorDisplayName
text
Body
I'd do something like this (pseudocode): <pre><code>// your 2d-array / matrix (N is the number of lines, M the number of columns) m[N][M] = ... // x coord of top left object containing 1 baseM = -1 baseFound = false // expected width of rectangle width = 0 widthLocked = false // this is set to true after we started recognizing a rectangle and encounter // a row where the object expected to be 1 in order to extend the rectangle // is 0. heightExceeded = false // loop over matrix for i = 1 to N: // lines // at the beginning of a line, if we already found a base, lock the width // (it cannot be larger than the number of 1s in the row of the base) if baseFound: widthLocked = true for j = 1 to M: // columns if m[i][j] == 1: if not baseFound: baseM = j, baseFound = true width = 1 else: if j < baseM: // not in rectangle in negative x direction return false if heightExceeded: // not in rectangle in y direction return false if widthLocked: // not in rectangle in positive x direction if j - baseM >= width: return false else: width = j - baseM elseif baseFound: if widthLocked: // check if we left the rectangle and memorize it if j == baseM: heightExceeded = true if not heightExceeded: // check if object in rectangle is 0 if j > baseM && j < baseM + width: return false if baseFound: return true else: // what is the expected result if no rectangle has been found? return ? </code></pre> Runs in O(n). Beware of bugs. Note: Most programming languages have 0-based arrays, so you may need to loop <code>i</code> from <code>0</code> to <code>N - 1</code>, same for <code>j</code>.
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1. This table or related slice is empty.
PostParentId
1. POfind a rectangle of 1s in 2d array of 1s and 0s
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 PTQuestion
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1. PTAnswer
UserLastEditorUserId
1. USflyx
UserOwnerUserId
1. USflyx
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