Bad Hair Day （單調棧）

單調棧就是當把一個元素加進去以前，把比他值小的元素都彈出來ios Some of Farmer John's N cows (1 ≤ N ≤ 80,000) are having a bad hair day! Since each cow is self-conscious about her messy hairstyle, FJ wants to count the number of ot

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