大约有 544 项符合查询结果（耗时：0.0071秒） [XML]
Can two different strings generate the same MD5 hash code?
...e code (alternate link to the paper).
Another test:
$ echo '0e306561559aa787d00bc6f70bbdfe3404cf03659e704f8534c00ffb659c4c8740cc942feb2da115a3f4155cbb8607497386656d7d1f34a42059d78f5a8dd1ef' | xxd -r -p | tee >/dev/null >(md5) >(sha1sum)
756f3044edf52611a51a8fa7ec8f95e273f21f82 -
cee9a4...
Finding most changed files in Git
...be much slower, but will work for that purpose.
git ls-files |
while read aa
do
printf . >&2
set $(git log --follow --oneline "$aa" | wc)
printf '%s\t%s\n' $1 "$aa"
done > bb
echo
sort -nr bb
rm bb
git-most.sh
...
CMake link to external library
...n PBXBuildFile section \*\/#\/\* Begin PBXBuildFile section \*\/\
26B12AA11C10544700A9A2BA \/\* GameKit.framework in Frameworks \*\/ = {isa = PBXBuildFile; fileRef = 26B12AA01C10544700A9A2BA \/\* GameKit.framework xxx\*\/; };#g
s#\/\* Begin PBXFileReference section \*\/#\/\* Begin PBXFileRefere...
Can virtual functions have default parameters?
..."\n"; }
};
int main()
{
A * a = new B();
a->display();
A* aa = new A();
aa->display();
B* bb = new B();
bb->display();
}
Which produces the following output:
Derived::5
Base::5
Derived::9
With the aid of the explanation above, it is easy to see why. At compil...
Replacing NAs with latest non-NA value
...,NA,NA))
[1] 1 1 1 1 3 4 5 5 5 5 5 5 5 5
> replace_na_with_last(c(NA,"aa",NA,"ccc",NA))
[1] "aa" "aa" "aa" "ccc" "ccc"
speed is reasonable too:
> system.time(replace_na_with_last(sample(c(1,2,3,NA),1e6,replace=TRUE)))
user system elapsed
0.072 0.000 0.071
...
Convert hex string to int
...y too big for an int (which is 4 bytes and signed).
Use
Long.parseLong("AA0F245C", 16);
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Flatten nested dictionaries, compressing keys
...> testData = {
'a':1,
'b':2,
'c':{
'aa':11,
'bb':22,
'cc':{
'aaa':111
}
}
}
from pprint import pprint as pp
>>> pp(dict( flattenDict(testData, lift=lambda x:(x,)) ))
{('a',): 1,
('b',): ...
Occurrences of substring in a string
...e that this might or might not return the result expected. With substring "aa" and string to search "aaa" the number of occurences expected may be one (returned by this code), but may be two as well (in this case you'll need "lastIndex++" instead of "lastIndex += findStr.length()") depending on what...
Difference between namespace in C# and package in Java
...mapped to a file system.
system.security.cryptography.AsymmetricAlgorithm aa;
may be replaced:
import system.security.Crypography;
class xxx { ...
AsymmetricAlgorithm aa;
There is no alias for packages. You have to use import statement or fully-qualified name to mention the specific type.
pa...
Padding characters in printf
...printf '%0.1s' "-"{1..60})
padlength=40
string2='bbbbbbb'
for string1 in a aa aaaa aaaaaaaa
do
printf '%s' "$string1"
printf '%*.*s' 0 $((padlength - ${#string1} - ${#string2} )) "$pad"
printf '%s\n' "$string2"
string2=${string2:1}
done
Unfortunately, in that technique, the len...