This approach is already widely used by many libraries. It would simply flatten it to a single dimensional vector that contains: 8, 7, 6, 3, 2, 1, 9, 4, 1, 2, 3, 8, Though i'm finding a great deal of difficulty. For example: If I have a matrix of: 8 7 6 3. It will store the data im memory identically to a bidimensional array. So, i'm attempting to write a function that flattens a two dimensional vector into a one dimensional vector and returns it. So, making a vector of array can be done indirectly, by wrapping the array in a class or by using existing std::array. The bigger problem, it breaks the structure of the multidimensional array. This is the prefix MEX for the i th element. Now find the smallest element remaining in the set. Traverse through the array from i 0 to N-1: For each element, erase that element from the set. At least it is redundant, but it is not that a big problem. Create a set and store the numbers from 0 to the maximum element in the set. There is no good reason to keep the size of each array element while it is known to be the same for all elements. Multidimensional array - Any array which has a dimension higher than One is a multidimensional array. Technically the data pointer will point to something identical to multidimensional array. Answer: 2-D array - A two-dimensional array is nothing but a matrix, that has rows and columns in it. That will cause problems to interoperability with other programming languages or libraries that are not C++ vector aware.īut a vector of arrays will point always to a contiguous segment of memory, containing all segments of a multidimensional array in correct order in a single place. These segments will not be placed one after another like in a multidimensional array. Vectors of vectors contains vectors as elements: each contains a copy of size, capacity, pointer to data pointing to random segments of data in memory.
Is an unpleasant experience to fall in the trap of fixing errors caused by not understanding clearly the difference between arrays and pointers, or between multidimensional arrays and arrays of arrays. The vector of vectors fits many purposes, but is not the answer and in some cases it is just wrong. STL in C++ 11 and upper already provides such a wrapper std::array. Wrapping the array in a class will make the vector data to meet the requirements of a multidimensional array. Question is already answered by anon, but some explanations still needed. In fact technically you can store C++ arrays in a vector Not directly, but with a simple workaround.
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