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![[Leetcode] 159. Longest Substring with At Most Two Distinct Characters](/_next/image?url=https%3A%2F%2Fi.ytimg.com%2Fvi%2FqESnla9_BtI%2Fhq720.jpg%3Fsqp%3D-oaymwExCNAFEJQDSFryq4qpAyMIARUAAIhCGAHwAQH4Af4JgALABYoCDAgAEAEYZSBlKGUwDw%3D%3D%26rs%3DAOn4CLBDMezZeSi-MyqjQucpSDCKqCmS1w&w=256&q=75)
