How to Fix Container With Most Water Errors

In this tutorial, you'll learn about How to Fix Container With Most Water Errors. We cover key concepts, practical examples, and best practices.

Fix container with most water errors when area calculation uses wrong height (min not max) or pointers move incorrectly.

Quick Fix

Wrong

def water(h):
    mx=0
    for i in range(len(h)):
        for j in range(i+1,len(h)):
            mx=max(mx,(j-i)*min(h[i],h[j]))
    return mx

O(n^2) brute force.

Right

def water(h):
    l=0; r=len(h)-1; mx=0
    while l<r:
        mx=max(mx,(r-l)*min(h[l],h[r]))
        if h[l]<h[r]: l+=1
        else: r-=1
    return mx

[1,8,6,2,5,4,8,3,7] -> 49. O(n) time, O(1) space.

Prevention

Two pointers from both ends. Move the shorter line inward. Area = width * min(height[l], height[r]).

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