Sometimes, a pointer can be declared to point to another pointer which points to a variable. We use pointers to pass information back and forth between a function and its reference point.
A pointer in C is a variable that represents the location of an item, such as a variable or an array. It is also referred to as a pointer-to-pointer.
Hope this helped and encourages you to try out this technique if not done already.In C programming, a double pointer is a pointer that points to another pointer. def arraysIntersection(arr1, arr2, arr3): i, j, k = 0, 0, 0 p, q, r = len(arr1), len(arr2), len(arr3) res = while i < p and j < q and k < r: if arr1 = arr2 = arr3: res.append(arr1) i += 1 j += 1 k += 1 continue min_next_possible = max(arr1, arr2, arr3) if arr1 < min_next_possible: i += 1 if arr2 < min_next_possible: j += 1 if arr3 < min_next_possible: k += 1 return res We start with three-pointers and increase the ones that are smaller than max of three elements. Given three integer arrays arr1, arr2 and arr3 sorted in strictly increasing order, return a sorted array of only the integers that appeared in all three arrays. This technique can be extended to more than two pointers. Note: In the last problem, the array was not sorted but still two pointer approach was applicable. Implementation in Python: def maxArea(height): l, r, max_area = 0, len(height)-1, 0 while l= height: h = height l+=1 else: h = height r-=1 print(l,r) if h * base > max_area: max_area = h * base return max_area Let see how we use the above logic by solving some problems. Note: Sliding window is another variant of two pointer approach. In the right one, we continue till our start is less than the end (i Pointer Initialization - Starting points. As in the above pic, the two-pointer approach has three main steps:
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