#DailyCodingChallenge Day 270 Task: Check if the array forms a valid permutation of [1…n-1, n, n]. Solution: Find the max value n, ensure array size is n+1, count frequencies, confirm 1…n–1 appear once and n appears twice. #LeetCode

coder_s_Snippet's tweet image. #DailyCodingChallenge
Day 270
Task: Check if the array forms a valid permutation of [1…n-1, n, n].
Solution: Find the max value n, ensure array size is n+1, count frequencies, confirm 1…n–1 appear once and n appears twice.
#LeetCode

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