求大神修改Lingo整数规划程序啊~程序附下MODEL:sets:city/1..7/:u;link(city,city):dist,x;endsetsn=@size(city);data:dist=0 3 4 7 100 100 1003 0 3 2 4 100 1004 3 0 100 5 7 1007 2 100 0 2 100 6100 4 5 2 0 1 4100 100 7 100 1 0 2100 100 100

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