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I found implementation using 2D array http://www.geeksforgeeks.org/dynamic-programming-set-10-0-1-knapsack-problem/. But how to implement it using 1D array and if it is not possible then why?
Note that each of values in the current row uses only elements of the current and previous rows. Hence you can implement the algorithm with an array K[2][W], which is the same as using an array K[2*W] with some additional trivial index calculations
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vector1.insert( vector1.end(), vector2.begin(), vector2.end() );
What will be the Time complexity of concatenating/copying two vectors?
From the standard [vector.modifiers]/2:
Complexity: If reallocation happens, linear in the number of elements
of the resulting vector; otherwise, linear in the number of elements
inserted plus the distance to the end of the vector.
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Let's say I have an array like:
{1,2,3}
So, for example, some function like:
arr.push(4);
Will make this array:
{4,1,2,3}
How do I do that?
It is not possible to push an element to an array. The size of an array remains the same through the lifetime of the array.
What can be done instead is to create a new, larger array and copy the elements from the old array. Such dynamic growable "array" data structure is provided for you in the standard library: std::vector.
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Hi I need to type a code which calls the key and its values such as "Tokyo 10 23 32". I can't use arrays or vectors how can I store my data? Thanks.
Use std::map or std::unordered_map. std::map uses a Red-Black tree, and std::unordered_map uses a Hash Table.
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Does Eigen contains an algorithm for solving nearest correlation matrix problems?
You can use the SelfAdjointEigenSolver to decompose your non-positive definite matrix, edit the negative eigenvalues to something slightly positive and (manually) re-compose the matrix.
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Is there some function in boost library which can sort key-value pairs?
e.g. keys being an array of double variables, and values are some index (integer) of the array.
What you probably want is a std::map<My_Double_Array, size_t> along with your own My_Double_Array class that wraps your array of double variables and provides a operator <() for sorting. Or simply std::map<std::vector<double>, size_t> might be all you need.