If you omit the second number, sort will assume that the key starts at the given field and continues to the end of each line.

如果您省略了第二个数字，那么sort会假定键是从给定的字段开始，一直到每一行的末尾。

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The desc field contains the line number and the value contains the code address for the start of that source line.

desc字段包含行号，而value包含源代码行的起始部分的代码地址。

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Output will consist of one line for each triangle, containing the number of trees for that triangle right justified in a field of width 4.

每个输入的三角形对应一行输出，打印出在该三角形内部的树的数量。输出的数字应右对齐至第4列。

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