Given an array of positive integers and a target integer, the challenge is to find the smallest contiguous subarray whose elements sum up to be greater than or equal to the target.
Brute Force Approach involves exhaustive exploration of all possible subarrays by using nested loops, resulting in a time complexity of O(n^2). Redundant calculations may occur.
Sliding Window Technique offers an optimized solution by maintaining a 'window' defined by two pointers that slide across the array. It achieves a time complexity of O(n) and avoids redundant calculations.
For small arrays, the brute force approach may suffice, while the sliding window technique is recommended for larger datasets due to its superior efficiency.