Container With Most Water
Given array of heights, find max water container area Area = min(height[i], height[j]) * (j - i) Example: [1,8,6,2,5,4,8,3,7] => 49
You're looking for two lines that hold the most water between them. The brute force checks every pair, but interviewers want to see you discover the two-pointer insight: start wide, then shrink inward by moving the shorter line. It's a beautiful example of greedy reasoning that comes up in many optimization problems.
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