Abstract: 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 ...

int a = nums[i] - k, b = nums[i], c = nums[i] + k; if(left.count(a)) record.insert({min(a, b), max(a, b)}); if(left.count(c)) record.insert({min(b, c), max(b, c)}); ...