大约有 46,000 项符合查询结果（耗时：0.0287秒） [XML]
Count occurrences of a char in plain text file
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edited Oct 21 '09 at 21:45
answered Oct 21 '09 at 21:37
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How to convert a std::string to const char* or char*?
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1091
If you just want to pass a std::string to a function that needs const char* you can use
std:...
What regex will match every character except comma ',' or semi-colon ';'?
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answered Sep 11 '09 at 5:41
Mehrdad AfshariMehrdad Afshari
379k8383 gold badges822822 silver badges775775 bronze badges
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Floating point vs integer calculations on modern hardware
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edited Dec 19 '13 at 21:03
vy32
23.1k2828 gold badges9999 silver badges187187 bronze badges
answered M...
C++ performance challenge: integer to std::string conversion
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#include <string>
const char digit_pairs[201] = {
"00010203040506070809"
"10111213141516171819"
"20212223242526272829"
"30313233343536373839"
"40414243444546474849"
"50515253545556575859"
"60616263646566676869"
"70717273747576777879"
"80818283848586...
Convert a list of data frames into one data frame
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answered Feb 27 '18 at 20:05
joekliegjoeklieg
1,50411 gold badge55 silver badges33 bronze badges
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How to write the Fibonacci Sequence?
...rning the Fibonacci numbers between a range (ie. startNumber 1, endNumber 20 should = only those numbers between 1 & 20), I have written for the program to display all Fibonacci numbers between a range (ie. startNumber 1, endNumber 20 displays = First 20 Fibonacci numbers). I thought I had a sure-fi...
Expand a random range from 1–5 to 1–7
...2, 3 },
{ 4, 5, 6, 7, 1 },
{ 2, 3, 4, 5, 6 },
{ 7, 0, 0, 0, 0 }
};
int result = 0;
while (result == 0)
{
int i = rand5();
int j = rand5();
result = vals[i-1][j-1];
}
return result;
}
How does it work? Think of it like this: i...
Getting key with maximum value in dictionary?
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You can use operator.itemgetter for that:
import operator
stats = {'a':1000, 'b':3000, 'c': 100}
max(stats.iteritems(), key=operator.itemgetter(1))[0]
And instead of building a new list in memory use stats.iteritems(). The key parameter to the max() function is a function that computes a key th...
Why does (0 < 5 < 3) return true?
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Order of operations causes (0 &lt; 5 &lt; 3) to be interpreted in javascript as ((0 &lt; 5) &lt; 3) which produces (true &lt; 3) and true is counted as 1, causing it to return true.
This is also why (0 &lt; 5 &lt; 1) returns false, (0 &lt; 5) returns t...