I'm preparing for exams and there's this question I can't find answer to. Read bunch of articles, closest I found was
Arrays in C# come in three flavors: single-dimensional, multidimensional rectangular arrays (like the C++ multidimensional arrays), and jagged arrays (arrays of arrays).
So this suggests that there's no jagged arrays in C++, but it exists in Java. Another thing is that just C# can have non-zero array lower-bound(like a[-1,3] or a[4,9]. Would it be considered different array structure?
C++
By the same reading, the block of text suggests that C++ doesn't have single dimensional arrays. This is clearly absurd!
C++ has both... You clearly can make a int**, that is a pointer to a pointer (so an "array" of pointers, so an "array" of "arrays"), like in C# you can have a int[][], that is an array of int[]. For C++ see various examples here. Note that this syntax is more C than C++... In C++ you should use std::array, like here.
This doesn't exist in C++... They are internally implemented in C# by the same code that implements multi dimensional arrays, and exist for historical reasons (pseudo-compatibility with old versions of VB)
Java
Java doesn't have multi-dimensional arrays (see here). It does have jagged arrays, with a trick: if you want you can initialize a jagged array that has all the elements of the same size in a single command or if they have different sizes/some of them can be null, you can initialize them manually.
int[][] num = new int[4][2];
vs
int[][] num = new int[4][];
num[0] = new int[1];
num[1] = new int[2];
num[2] = new int[3];
num[3] = new int[4];
So in the end
C# Java C++
single-dimensional array x x x
multi-dimensional array x x
si.di. non-zero based array x
mu.di. non-zero based array x
jagged array x x x