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How do you rotate a two dimensional array?
...
O(n^2) time and O(1) space algorithm ( without any workarounds and hanky-panky stuff! )
Rotate by +90:
Transpose
Reverse each row
Rotate by -90:
Method 1 :
Transpose
Reverse each column
Method 2 :
Reverse each row
Transp...
Can't compare naive and aware datetime.now()
I am trying to compare the current date and time with dates and times specified in models using comparison operators:
7 Ans...
Finding all possible combinations of numbers to reach a given sum
...others mention this is an NP-hard problem. It can be solved in exponential time O(2^n), for instance for n=10 there will be 1024 possible solutions. If the targets you are trying to reach are in a low range then this algorithm works. So for instance:
subset_sum([1,2,3,4,5,6,7,8,9,10],100000) genera...
Best way to repeat a character in C#
...about this:
string tabs = new String('\t', n);
Where n is the number of times you want to repeat the string.
Or better:
static string Tabs(int n)
{
return new String('\t', n);
}
share
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im...
How can I transition height: 0; to height: auto; using CSS?
...t solution! The speed of the transition is calculated is calculated as the time you specify to transition to the max-height value... but since height will be less than max-height, the transition to actual height will occur faster (often significantly) than the time specified.
–...
How to convert TimeStamp to Date in Java?
How do I convert 'timeStamp' to date after I get the count in java?
16 Answers
16
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multiple prints on the same line in Python
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This doesn't work if you have both prints and a time consuming action in between (all in the same function / indentation level). Before the action starts, there is no output at all and after it is finished the output appears as whole
– Paddre
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How can I remove specific rules from iptables?
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try to execute this -D command multiple times, and it will delete all of them.
– Zhenyu Li
Sep 17 '14 at 11:09
4
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Trees in Twitter Bootstrap [closed]
... &.parent_li > span {
cursor: pointer;
/*Time for some hover effects*/
&:hover, &:hover+ul li span {
background: @grayLighter;
border: 1px solid @gray;
color: #000;
}
}
/...
C++ Singleton design pattern
...++ static initialization order problems
See this article describing lifetimes:
What is the lifetime of a static variable in a C++ function?
See this article that discusses some threading implications to singletons:
Singleton instance declared as static variable of GetInstance method, is it thr...