jackfiled
89ce313b77
Reviewed-on: https://git.bupt-hpc.cn/jackfiled/CanonSharp/pulls/4 Co-authored-by: jackfiled <xcrenchangjun@outlook.com> Co-committed-by: jackfiled <xcrenchangjun@outlook.com>
81 lines
1.1 KiB
ObjectPascal
81 lines
1.1 KiB
ObjectPascal
program main;
|
|
var
|
|
n, m: integer;
|
|
ret,i: integer;
|
|
u,v,c,fa: array [0..1004] of integer;
|
|
|
|
function find(x: integer):integer;
|
|
var asdf: integer;
|
|
begin
|
|
if x = fa[x] then
|
|
find := x
|
|
else
|
|
begin
|
|
asdf := find(fa[x]);
|
|
fa[x] := asdf;
|
|
find := asdf;
|
|
end;
|
|
end;
|
|
|
|
function same(x,y: integer):integer;
|
|
begin
|
|
x := find(x);
|
|
y := find(y);
|
|
if x = y then
|
|
same := 1
|
|
else
|
|
same := 0;
|
|
end;
|
|
|
|
function prim:integer;
|
|
var i,j,t,res: integer;
|
|
begin
|
|
for i := 0 to m - 1 do
|
|
begin
|
|
for j := i + 1 to m - 1 do
|
|
begin
|
|
if c[i] > c[j] then
|
|
begin
|
|
t := u[i];
|
|
u[i] := u[j];
|
|
u[j] := t;
|
|
t := v[i];
|
|
v[i] := v[j];
|
|
v[j] := t;
|
|
t := c[i];
|
|
c[i] := c[j];
|
|
c[j] := t;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
for i := 1 to n do
|
|
fa[i] := i;
|
|
res := 0;
|
|
for i := 0 to m - 1 do
|
|
begin
|
|
if same(u[i], v[i]) = 0 then
|
|
begin
|
|
res := res + c[i];
|
|
fa[find(u[i])] := v[i];
|
|
end;
|
|
end;
|
|
|
|
prim := res;
|
|
end;
|
|
|
|
begin
|
|
ret := 0;
|
|
read(n);
|
|
read(m);
|
|
for i := 0 to m - 1 do
|
|
begin
|
|
read(u[i]);
|
|
read(v[i]);
|
|
read(c[i]);
|
|
end;
|
|
|
|
ret := prim;
|
|
write(ret);
|
|
end.
|