NKCITY - Xây dựng thành phố
Tác giả: flashmt
Ngôn ngữ: Pascal
uses math;
const fi='';
var m,n,re:longint;
cha,sl:array[1..1000] of longint;
a,b,c:array[1..10000] of longint;
procedure rf;
var i:longint;
begin
read(n,m);
for i:=1 to m do read(a[i],b[i],c[i]);
end;
procedure sort(l,r:longint);
var i,j,x,y:longint;
begin
i:=l; j:=r; x:=c[(i+j) shr 1];
repeat
while c[i]<x do i:=i+1;
while c[j]>x do j:=j-1;
if i<=j then
begin
y:=c[i]; c[i]:=c[j]; c[j]:=y;
y:=a[i]; a[i]:=a[j]; a[j]:=y;
y:=b[i]; b[i]:=b[j]; b[j]:=y;
i:=i+1; j:=j-1;
end;
until i>j;
if i<r then sort(i,r);
if l<j then sort(l,j);
end;
function find(x:longint):longint;
begin
if cha[x]=x then find:=x
else
begin
cha[x]:=find(cha[x]);
find:=cha[x];
end;
end;
procedure pr;
var i,x,y,dem:longint;
begin
sort(1,m);
for i:=1 to n do
begin
cha[i]:=i; sl[i]:=1;
end;
dem:=0; i:=0;
repeat
i:=i+1;
x:=find(a[i]); y:=find(b[i]);
if x<>y then
begin
inc(dem);
if sl[x]>sl[y] then
begin
cha[y]:=x;
sl[x]:=sl[x]+sl[y];
end
else
begin
cha[x]:=y;
sl[y]:=sl[y]+sl[x];
end;
end;
until dem=n-1;
writeln(c[i]);
end;
begin
assign(input,fi); reset(input);
rf;
pr;
close(input);
end.