Web Reference: Make Array Strictly Increasing - Given two integer arrays arr1 and arr2, return the minimum number of operations (possibly zero) needed to make arr1 strictly increasing. In-depth solution and explanation for LeetCode 1187. Make Array Strictly Increasing in Python, Java, C++ and more. Intuitions, example walk through, and complexity analysis. Better than official and forum solutions. We define \ (f [i]\) as the minimum number of operations to convert \ (arr1 [0,..,i]\) into a strictly increasing array, and \ (arr1 [i]\) is not replaced. Therefore, we set two sentinels \ (-\infty\) and \ (\infty\) at the beginning and end of \ (arr1\).
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Last Updated: April 9, 2026
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