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Easy interview question got harder: given numbers 1..100, find the missing number(s) given exactly k
...s of given numbers
Subtract to get sums of i-th powers of unknown numbers. Call the sums bi.
Use Newton's identities to compute coefficients from bi; call them ci. Basically, c1 = b1; c2 = (c1b1 - b2)/2; see Wikipedia for exact formulas
Factor the polynomial xk-c1xk-1 + ... + ck.
The roots of the po...
Remove data.frame row names when using xtable
OK, I admit this one is a bit uptight (read: "stupid"), and I assume it's quite easy too. I'm writing a report and I want to use xtable package for LaTeX table generation (note that memisc package does the job, but say I want to do this solely with xtable ).
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Calculate a percent with SCSS/SASS
I want to set a width in percentage in scss via calculation, but it gives me errors..
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What are the differences between a clustered and a non-clustered index?
...clustered indexes should be set on a field that is normally incremental ie Id or Timestamp.
SQL Server will normally only use an index if its selectivity is above 95%.
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Check whether HTML element has scrollbars
...e a couple of weeks ago. It worked for me.
var div = document.getElementById('container_div_id');
var hasHorizontalScrollbar = div.scrollWidth > div.clientWidth;
var hasVerticalScrollbar = div.scrollHeight > div.clientHeight;
/* you'll get true/false */
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What's the difference between HEAD, working tree and index, in Git?
...an X
Git Is Your Friend not a Foe Vol. 3: Refs and Index
They are basically named references for Git commits. There are two major types of refs: tags and heads.
Tags are fixed references that mark a specific point in history, for example v2.6.29.
On the contrary, heads are always moved to...
How to increase the maximum number of opened editors in IntelliJ?
...if you are using the Recent Files (Cmd+E) feature.
Works for all IntelliJ IDEA platform based IDEs.
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How to revert Master branch to upstream
...it remote update
# the double hyphen ensures that upstream/master is
# considered as a revision and not confused as a path
git reset --hard upstream/master --
Then push this new branch-head to your origin repository, ignoring the fact that it won't be a fast-forward:
git push origin +master
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Stretch and scale CSS background
...work with lower verions of Internet Explorer, try these CSS:
filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='.myBackground.jpg', sizingMethod='scale');
-ms-filter: "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='myBackground.jpg', sizingMethod='scale')";
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alternatives to REPLACE on a text or ntext datatype
... var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
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