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有个水坑，从横截面图来看，坑底成阶梯状，由从左至右的 1..N 个的平面构成（其中 1 ≤ N ≤ 100,000），如图（详细见内部文档）-Have a puddle, from the cross-section view, into a ladder-like Bottom, from left to right 1 .. N from a flat composition (where 1 ≤ N ≤ 100,000), figure (for details see the internal document)
