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Git search for string in a single file's history
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Why are elementwise additions much faster in separate loops than in a combined loop?
..., there is a high chance that large allocations will appear at the same offset from a page-boundary.
Here's the test code:
int main(){
const int n = 100000;
#ifdef ALLOCATE_SEPERATE
double *a1 = (double*)malloc(n * sizeof(double));
double *b1 = (double*)malloc(n * sizeof(double));
d...
SQL Server: What is the difference between CROSS JOIN and FULL OUTER JOIN?
...explains the various types of joins with examples of output given a sample set of tables.
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Is git not case sensitive?
...It is going to depend on the core.ignorecase configuration value, which is set to false in case-sensitive filesystems and true in msysgit on Windows.
core.ignorecase
If true, this option enables various workarounds to enable git to work better on filesystems that are not case sensitive, lik...
Writing outputs to log file and console
In Unix shell, I have a env file ( env file defines the parameters required for running the user script like log file name and path, redirect outputs and errors to log file, database connection details, etc ) which redirects all the outputs ( echo messages ) and errors to the log file from the execu...
Is there a way to use shell_exec without waiting for the command to complete?
...permissions on cmd.exe - add Read and Execute for IUSR_YOURMACHINE (I also set write to Deny).
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Most common C# bitwise operations on enums
For the life of me, I can't remember how to set, delete, toggle or test a bit in a bitfield. Either I'm unsure or I mix them up because I rarely need these. So a "bit-cheat-sheet" would be nice to have.
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Finding three elements in an array whose sum is closest to a given number
...pate in any satisfying sum -- so we may as well discard it! Which we do by setting j = j+1 and starting over (though it may help to think in terms of solving a smaller subproblem recursively instead). Likewise if the sum A[j] + A[k] is too high, then we know that A[j'] + A[k] must also be too high ...
How to trigger XDebug profiler for a command line PHP script?
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You can pass INI settings with the -d flag: php -d xdebug.profiler_enable=On script.php.
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Maximum single-sell profit
...Let min = arr[0]
# For k = 1 to length(arr):
# If arr[k] < min, set min = arr[k]
# If profit < arr[k] - min, set profit = arr[k] - min
#
# This is short, sweet, and uses only O(n) time and O(1) memory. The beauty of
# this solution is that we are quite naturally led there by thi...