; x_i = coord_i(1); y_i = coord_i(2); % 城市i的横坐标为x_i,纵坐标为y_i
; x_j = coord_j(1); y_j = coord_j(2); % 城市j的横坐标为x_j,纵坐标为y_j" x+ D- I& p) g1 M6 \. C
; x_i = coord_i(1); y_i = coord_i(2); 1 A6 |; ~# v5 r7 [; S2 t4 `/ ~
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