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# Printing strings of length k from given subset

Date : November 18 2020, 01:01 AM
will be helpful for those in need Am trying to use recursion to print k length sets from given input. Example of what I want :
code :
``````klength(input,output,size,k-1,++curr);
``````
``````klength(input,output,size,k-1,curr+1);
``````

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## Idiomatic C++ for finding a range of equal length strings, given a vector of strings (ordered by length)

By : user3126054
Date : March 29 2020, 07:55 AM
should help you out given a std::vector< std::string >, the vector is ordered by string length, how can I find a range of equal length strength? , I expect that you could write a comparator as follows:
code :
``````struct LengthComparator {
bool operator()(const std::string &lhs, std::string::size_type rhs) {
return lhs.size() < rhs;
}
bool operator()(std::string::size_type lhs, const std::string &rhs) {
return lhs < rhs.size();
}
bool operator()(const std::string &lhs, const std::string &rhs) {
return lhs.size() < rhs.size();
}
};
``````
``````std::equal_range(words.begin(), words.end(), length, LengthComparator());
``````

## Sorting Algorithm of strings based on length works (without printing all results correct)?

By : ARS
Date : March 29 2020, 07:55 AM
should help you out The unexpected blank could be because your first element of the array "A" is empty string. The scanf() reads all the characters but leaves the '\n' (newline) in the stdin, which is read by you first fgets() and saved as the first entry in the array "A".
Change this
code :
``````int i,j,N;

printf("\nInput amount of strings ");
scanf("%d",&N);
``````
``````int i,j,N;
char temp;
printf("\nInput amount of strings ");
scanf("%d%c",&N,&temp);
``````

## Generating random Strings using StringBuilder results in Strings with length less than predefined length

By : Anton Shishkin
Date : March 29 2020, 07:55 AM
Hope that helps The problem is due to characters.split("");, which will return an array with the first entry being empty string for Java version 7 and before. It will return the expected result for Java 8 and up.
You can use characters.split("(?!^)"); to split a string into characters. This method works on every version of Java. The split() function expects a regex, and the regex above does not match at the beginning of the string while matching everywhere else, which avoids producing an empty string as the first entry altogether.

## Why does the GCC Compiler allows us to declare zero length strings (directly) and negative length strings (indirectly)?

By : user1659980
Date : March 29 2020, 07:55 AM
around this issue Because it's not the same thing.
In the first case, you're defining an array, using a fixed, compile-time size In the second case, you're defining a variable length array or VLA.
code :
`````` #define MAX_LENGTH -100    // will raise a compilation error
``````
``````enum { MAX_LENGTH = -100 };    // will raise a compilation error
``````
``````assert(MAX_LENGTH > 0);
char string[MAX_LENGTH];
``````

## Printing all binary strings of length N using recursion (in c)

By : Tam Su
Date : March 29 2020, 07:55 AM
it fixes the issue You are filling the binarystring right to left. Fill it left to right instead. For that you need to pass two parameters (e.g. position and length) to binary:
code :
``````void binary(int index, int length)
{
if (index == length)
return;
binarystring[index] = 0;
binary(index + 1, length);
binarystring[index] = 1;
binary(index + 1, length);
}
``````