Monotonic decreasing stack — for each day i, pop entries from
the stack whose temperature is strictly less than today's; their
answer is (i - popped_index).
temps = [73; 74; 75; 71; 69; 72; 76; 73]
answer = [ 1; 1; 4; 2; 1; 1; 0; 0]
sum = 10
Complementary to next_greater.ml (iter 256) — same monotonic-stack
skeleton but stores the distance to the next greater element
rather than its value.
Tests `match !stack with | top :: rest when …` pattern with
guard inside a while-cont-flag loop.
198 baseline programs total.
giles
8ab2f80615