Sparse arrays designed based on fourth-order difference co-array (DCA) can achieve significantly higher uniform degrees-of-freedom (uDOFs). However, most existing fourth-order sparse arrays do not ...

Given an array of ints, is it possible to choose a group of some of the ints, beginning at the start index, such that the group sums to the given target? However, with the additional constraint that ...

### example the number 25342 is an interesting one because the sum of each digit is 16. when each digit is summed again, it results in the number seven. also 43, 6001, and so on. in other words: if ...