# Questions tagged [c++]

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### How to count number of 1s of the first k positions in a bitset (bitmap)?

Input: Given a bitset $b$, which is is an array of 0s and 1s, of length $L$, and a positive integer $k$. Output: the total number of 1s in the first $k$ position of $b$. Obviously it can be done in \$...
0answers
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### Generate an AST from an indefinite grammar and logic

As said in the title, I have to generate an AST from a grammar and logic (or a"syntax" if you prefer). This grammar and syntax are both indefinite in the program, meaning that it is the user (a ...
1answer
44 views

### How is ReLU used in machine learning functions

I've seen how sigmoid would be used in machine learning sigmoid(dot(activations, weights)-bias) like this ^ but sigmoid makes sure your values are between 0 and ...
1answer
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### To find median of k sorted arrays of n elements each in less than O(n*k*log(k))

How to find median of k sorted arrays each of length n? Note that total elements would be n*k. I know it can be done in O(n*k*log(k)) using merge technique. I am looking for a better time efficient ...
1answer
357 views

### Why isn't deque implemented as a dynamic array?

We know that std::vector in C++ is implemented as a dynamic array with specific pattern of reallocation (multiplying capacity by a constant), which allows it to ...
1answer
431 views

### Find maximum non contiguous subarray that respect a specific rule [closed]

Given these two arrays: [5, 3, 4, 1, 2] [1, 3, 2, 4, 5] Find the maximum subsequence in both arrays that the index of the elements are in a crescent order: ...
1answer
614 views

### Find Length of longest substring with all 1's in a binary string with k queries

Given a string of size n consisting of 0s and/or 1s.you have to perform k queries and there are two types of queries possible. "1"(without quotes): Print length of the longest substring with all '1'. ...
1answer
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1answer
89 views

### Print maximum frequency number in an array(with slight modification)

There is an integer array and 2 variables Q and M.The output required is the number which has the maximum frequency in the array, but the catch is that each number in the array can be increased/...
2answers
113 views

### How do compilers implement symbolic (rather than textual) insertion?

From a programming language designer's point of view, how is "symbolic" insertion implemented as opposed to "textual" insertion using pre-processor macros? I understand the basics of how "textual" ...
1answer
413 views

### What type of function is main()?

As the functions are of 2 type:1.Pre-defined/library functions,2.User defined functions. What type of function is main() function? This doubt comes in my mind while writing a program we define the ...