编号1、2、3、4、5、6的6个城市的距离矩阵如下表所示。设推销员从1城出发，经过每个城市一次且仅一次，最后回到1城，选择适当的路线，推销员最短的行程是（ ）公里。
- A.75
- B.78
- C.80
- D.100
正确答案及解析
正确答案
解析
1→3→4→5→6→2→1，即23+4+10+12+21+10=80
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