vaibhavmisra's blog

Minimum operations to sort an array
By vaibhavmisra, history, 2 years ago, In English

Operation : Change any array element to arbitrary integer, O(N^2) would give TLE, My approach : ans = Length of array — Length of longest non-decreasing sub-sequence because I want maximum length already sorted, TC : O(NlgN),
Is this approach correct? Any other approaches?

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2 years ago, # |
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I think you're right. Since changing an element can be seen as simply delete it, the problem is actually finding a longest sorted subsequence. Thus it's indeed a LIS problem.

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2 years ago, # |
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This problem is from a hiring challenge.

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