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ocaml: phase 5.1 segment_tree.ml baseline (range-sum tree, fingerprint 4232)
Power-of-two-indexed segment tree over [1;3;5;7;9;11;13;15]:
build sums (root holds total = 64)
query returns range sum in O(log n)
update propagates a point delta back up the path
Sequence:
r1 = query [2,5] = 5 + 7 + 9 + 11 = 32
update idx 3 += 10 (so a[3] becomes 17)
r2 = query [2,5] = 5 + 17 + 9 + 11 = 42
encoded fingerprint = r1 + r2*100 = 32 + 4200 = 4232
Tests three mutually independent recursive functions with array
index arithmetic on 2*node / 2*node+1, half-bisection on mid =
(l+r)/2, bottom-up combine pattern.
167 baseline programs total.
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