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Partition the digit string s into the fewest contiguous substrings such that the integer value of each substring is <= k (return -1 if impossible). This requires a linear scan/greedy (or DP) approach to build the longest valid number segments under constraints s.length ≤ 1e5 and k ≤ 1e9.
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Leetcode 2522. Partition String Into Substrings With Values at Most K
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