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subroutine minty(coderk,ex,gamma,i1,infr,j1,la2,lp2,ma,
& mm,n,or,pile,piv,predw,sufval,type,u0)
implicit integer (a-z)
dimension lp2(*),la2(mm),or(ma),ex(ma)
dimension type(ma),predw(n),pile(n)
doubleprecision sufval(n),cumul,infr
doubleprecision gamma(ma),sf,piv(n),eps
coderk=0
cumul=0.
do 50 i=1,n
predw (i)=0
sufval(i)=infr
pile(i)=0
50 continue
predw(j1)=u0
sufval(j1)=cumul
top=1
bottom=0
pile(top)=j1
100 continue
bottom=bottom+1
ii=pile(bottom)
if(lp2(ii).eq.lp2(ii+1))goto 145
do 140 ll=lp2(ii),lp2(ii+1)-1
u=la2(ll)
if(ii.eq.ex(u)) goto 105
jj=ex(u)
if(predw(jj).gt.0) go to 140
goto 108
105 jj=or(u)
if(predw(jj).gt.0) go to 140
goto 120
108 continue
goto (110,115,140,115,140,115,112,110,115,140),type(u)
110 continue
sf=gamma(u)-piv(jj)+piv(ii)+sufval(ii)
if(sf.ge.sufval(jj)) go to 140
predw(jj)=-u
sufval(jj)=sf
go to 140
112 continue
sf=piv(ii)-piv(jj)+gamma(u)+sufval(ii)
if(sf.gt.sufval(jj)) go to 140
predw(jj)=-u
113 sufval(jj)=sf
go to 140
115 continue
top=top+1
if(top.le.n) goto 119
coderk=1
return
119 pile(top)=jj
predw(jj)=u
sufval(jj)=cumul
goto 140
120 continue
goto (140,130,135,140,130,125,130,135,140,130),type(u)
125 continue
sf=piv(ii)-piv(jj)-gamma(u)+sufval(ii)
if(sf.gt.sufval(jj)) go to 140
predw(jj)=-u
128 sufval(jj)=sf
go to 140
130 continue
top=top+1
if(top.le.n) goto 132
coderk=1
return
132 pile(top)=jj
predw(jj)=u
sufval(jj)=cumul
go to 140
135 continue
sf=piv(ii)-piv(jj)-gamma(u)+sufval(ii)
if(sf.ge.sufval(jj)) go to 140
sufval(jj)=sf
predw(jj)=-u
go to 140
140 continue
145 continue
if(predw(i1).gt.0) goto 300
if(bottom.ge.top) goto 200
goto 100
200 continue
eps=infr
do 240 i=1,n
if(predw(i).ge.0)go to 240
if(sufval(i).gt.eps)go to 240
umin=-predw(i)
if(type(umin).eq.6.or.type(umin).eq.7)goto 230
if(sufval(i).ge.eps)goto 240
230 eps=sufval(i)
imin=i
240 continue
if(eps.lt.infr) goto 245
coderk = 2
return
245 continue
umin=-predw(imin)
if(type(umin).ne.6.and.type(umin).ne.7)goto 250
cumul=eps
goto 300
250 continue
predw(imin)=-predw(imin)
cumul=eps
top=top+1
if(top.le.n)goto 260
coderk=1
return
260 pile(top)=imin
go to 100
300 continue
do 350 i=1,n
if(predw(i).gt.0)go to 330
piv(i)=piv(i)+cumul
go to 350
330 piv(i)=piv(i)+sufval(i)
350 continue
end
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