min 3x11+5x12+2x13+6x14+7x21+4x22+8x23+9x24+10x31+2x32+x33+8x34+50y1+30y2+25y3
st x11+x21+x31=14
x12+x22+x32=3
x13+x23+x33=16
x14+x24+x34=4
y1=@if(3x11+5x12+2x13+6x14=0,0,1)
y2=@if(7x21+4x22+8x23+9x24=0,0,1)
y3=@if(10x31+2x32+x33+8x34=0,0,1)
end
用LINDO这样编,出不来结果,有人知道为什么吗?