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⚙️AlgorithmAdvanced

Sum over Subsets (SOS) DP

Sum over Subsets (SOS) DP lets you compute F[mask] = sum of A[submask] over all submasks in O(n 2^n) instead of O(3^n).

#sos dp#subset zeta transform#mobius inversion+11
⚙️AlgorithmIntermediate

Prefix Sum and Difference Array

Prefix sums precompute running totals so any range sum [l, r] can be answered in O(1) time as prefix[r] - prefix[l-1].

#prefix sum
Advanced
Filtering by:
#inclusion exclusion
#difference array
#imos method
+12