Status: IN
Multiple solutions reduce seemingly iterative problems to O(1) closed-form mathematical expressions — arithmetic series, algebraic identities, or combinatorial formulas — bypassing simulation or accumulation entirely.
each solution discovers that the iteration has a closed-form equivalent (Gauss sum, series formula, steady-state identity, combinatorial count), collapsing O(n) or O(k) work to O(1)
Depends on (SL): max-sum-is-closed-form, leetcode-bank-closed-form, distinct-numbers-o1-mathematical-reduction, odd-subarray-count-formula