Trapping Rain Water
July 29, 2020Trapping rain water ilk bakışta görmek zor ancak şu şekilde düşünülebilir.
Engel uzunluklarını B dizisi ile ifade edelim. Herhangi bir i noktasındaki biriken su miktarına X(i) dersek
$$ X(i) = Min( max( B[k] k > i) , max(B[k] k < i ))) - B[i] $$
Bir noktanın sağındaki ve solundaki en uzun engelleri önceden hesaplarsak biz O(n) zamanlı çözümü verir.
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