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function [outputArg1] = duiou(a,n)
format rat
raw=a;
times=0;
while 1
if nargin==2 && times>=n
break
end
times=times+1;
tag="";
tag2=zeros(size(a,2),1);
tag2(1)=-1;
for i=2:size(a,1)
for j=2:size(a,2)
if a(i,j)==1 && ~any([a(2:i-1,j);a(i+1:size(a,1),j)])
tag(i,1)="x"+(j-1);
tag2(j,1)=a(i,1);
end
end
end
disp([tag rats(a)])
x_min=0;
positive = 1;
for i=2:size(a,1)
if a(1,i)<0
positive = 0;
for j=2:size(a,2)
if a(i,j)>0
positive =1;
end
end
if positive ==0
break
end
end
end
if positive ==0
outputArg1="无解1";
break
end
for i=2:size(a,1)
if x_min==0 && a(i,1)<0
x_min=i;
elseif a(i,1)>0 && x_min~=0
break
end
end
if x_min == 0
outputArg1=raw(1,:)*tag2;
break
end
tmp=9999;
y_min=0;
for i=2:size(a,2)
if a(x_min,i)<0 && -1*a(1,i)/a(x_min,i)<tmp
y_min = i;
tmp = -1*a(1,i)/a(x_min,i);
end
end
if y_min==0
outputArg1="无解2";
break
end
a(x_min,:)=a(x_min,:)/a(x_min,y_min);
for i=1:size(a,1)
if i==x_min
continue
end
a(i,:)=a(i,:) - a(x_min,:) * a(i,y_min);
end
disp("----------------------------------------------------------------------------------------------------");
end
end
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