（求助）这道题为什么算不对？

lierw14321

请问一下大家，这道题答案是C,为什么我总是算出B？谢谢啦！

The table above shows the cost, in dollars, of traveling to and from cities A,B,C,D,E, and F. A sales representative wants to leave from A, travel to C,E, and F, and return to A. If the first city that the sales representative travels to must be E, what is the minimum possible cost for the entire trip?
(A)$13
(B)$14
(C)$16

(D)$18
(E)$20

	To City A	City B	City C	City D	City E	City F
From City A		3	3	2	7	3
City B	3		3	4	5	5
City C	3	3		1	2	4
City D	2	4			5	5
City E	7	5		5		6
City F	3	5	4	5	6

joyq518

A->E  7
E->C  2
C-->F 4
F--> A 3

xiaxia0703

我也和楼主做出来的一样

为什么E—C 是2
表格里不是空白的嘛

xiaxia0703

明白了，表格里空白不代表是0
而是要自己填进去
E-C=C-E=2

lierw14321

啊！是这样子的啊！谢谢啦！