Code Sample 8: Maintaining the right triangle property.
代码示例8：保护直角三角形的属性。
Pascal's Triangle has the interesting property that every interior entry is the sum of the two entries above it.
帕斯卡三角一个有趣的地方是每一项都是它上方两项的和。
It is easy to construct an example which disproves the property of triangle inequality.
很容易构造一个不服从三角形不等式的例子。
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