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Count valid permutations under restrictions—apply combinatorial formulas or DP transitions to compute results in O(N). 🔗 Problem Link: https://www.codechef.com/problems/PERMCNTEZ?utm_source=youtube&utm_medium=video&utm_campaign=contest_solutions_2025&utm_content=starter_200 Learn DSA roadmap: https://www.codechef.com/roadmap/data ...
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