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Cod sursa(job #698893)
type pointer=^nod;
nod = record
y,cost:integer;
urm:pointer;
end;
var prim,ult:array[0..50001]of pointer;
d,v:array[0..250001]of integer;
i,j,n,m,x,y,cost:integer;
ok:boolean;
f:text;
procedure adauga(x,y,cost:integer);
var c:pointer;
begin
if prim[x]=nil then begin
new(prim[x]);
prim[x]^.y:=y;
prim[x]^.cost:=cost;
prim[x]^.urm:=nil;
ult[x]:=prim[x];
end else begin
new(c);
c^.y:=y;
c^.cost:=cost;
c^.urm:=nil;
ult[x]^.urm:=c;
ult[x]:=c;
end;
end;
procedure dfs;
var c,cc:pointer;
begin
cc:=prim[0];
ok:=true;
while (cc<>nil)and(ok=true) do begin
c:=prim[cc^.y];
inc(v[cc^.y]);
if v[cc^.y]>n then begin
writeln(f,'Ciclu negativ!');
ok:=false;
end;
while c<> nil do begin
if d[cc^.y]+c^.cost<d[c^.y] then begin
d[c^.y]:=d[cc^.y]+c^.cost;
adauga(0,c^.y,0);
end;
c:=c^.urm;
end;
cc:=cc^.urm;
end;
end;
begin
assign(f,'bellmanford.in');
readln(f,n,m);
for i:=1 to m do begin
readln(f,x,y,cost);
adauga(x,y,cost);
end;
close(f);
adauga(0,1,0);
for i:=2 to n do d[i]:=maxint;
assign(f,'bellmanford.out');
dfs;
if ok=true then for i:=2 to n do write(f,d[i],' ');
close(f);
end.