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Matrix.java
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Matrix.java
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import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.LinkedList;
import java.util.List;
//import java.util.Queue;
class WeightedEdge {
int v, w;
public WeightedEdge(int v, int w) {
this.v = v;
this.w = w;
}
}
public class Matrix {
static InputStream is;
static PrintWriter out;
static String INPUT = "";
static List<List<WeightedEdge>> adjList;
static boolean[] machine;
static long[][] dp;
static void dfs(int u, int parent) {
dp[u][1] = 0;
dp[u][0] = machine[u] ? Integer.MAX_VALUE : 0;
List<WeightedEdge> wList = adjList.get(u);
for (WeightedEdge we : wList) {
int v = we.v, w = we.w;
if (v != parent) {
dfs(v, u);
dp[u][1] += Math.min(dp[v][0], dp[v][1] + w);
dp[u][1] = Math.min(dp[u][1], dp[u][0] + dp[v][1]);
if (!machine[u])
dp[u][0] += Math.min(dp[v][0], dp[v][1] + w);
}
}
}
static void solve() {
int n = ni(), k = ni();
int u, v, w;
adjList = new ArrayList<List<WeightedEdge>>(n);
for (int i = 0; i < n; i++) {
adjList.add(new LinkedList<WeightedEdge>());
}
for (int i = 0; i < n - 1; i++) {
u = ni();
v = ni();
w = ni();
adjList.get(u).add(new WeightedEdge(v, w));
adjList.get(v).add(new WeightedEdge(u, w));
}
machine = new boolean[n];
for (int i = 0; i < k; i++) {
machine[ni()] = true;
}
dp = new long[n][2];
dfs(0, -1);
// for(int i=0;i<n;i++){
// System.out.println(Arrays.toString(dp[i]));
// }
out.println(Math.min(dp[0][0], dp[0][1]));
}
public static void main(String[] args) throws Exception {
long S = System.currentTimeMillis();
is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(
INPUT.getBytes());
out = new PrintWriter(System.out);
solve();
out.flush();
long G = System.currentTimeMillis();
tr(G - S + "ms");
}
private static boolean eof() {
if (lenbuf == -1)
return true;
int lptr = ptrbuf;
while (lptr < lenbuf)
if (!isSpaceChar(inbuf[lptr++]))
return false;
try {
is.mark(1000);
while (true) {
int b = is.read();
if (b == -1) {
is.reset();
return true;
} else if (!isSpaceChar(b)) {
is.reset();
return false;
}
}
} catch (IOException e) {
return true;
}
}
private static byte[] inbuf = new byte[1024];
static int lenbuf = 0, ptrbuf = 0;
private static int readByte() {
if (lenbuf == -1)
throw new InputMismatchException();
if (ptrbuf >= lenbuf) {
ptrbuf = 0;
try {
lenbuf = is.read(inbuf);
} catch (IOException e) {
throw new InputMismatchException();
}
if (lenbuf <= 0)
return -1;
}
return inbuf[ptrbuf++];
}
private static boolean isSpaceChar(int c) {
return !(c >= 33 && c <= 126);
}
private static int skip() {
int b;
while ((b = readByte()) != -1 && isSpaceChar(b))
;
return b;
}
private static double nd() {
return Double.parseDouble(ns());
}
private static char nc() {
return (char) skip();
}
private static String ns() {
int b = skip();
StringBuilder sb = new StringBuilder();
while (!(isSpaceChar(b))) { // when nextLine, (isSpaceChar(b) && b !=
// ' ')
sb.appendCodePoint(b);
b = readByte();
}
return sb.toString();
}
private static char[] ns(int n) {
char[] buf = new char[n];
int b = skip(), p = 0;
while (p < n && !(isSpaceChar(b))) {
buf[p++] = (char) b;
b = readByte();
}
return n == p ? buf : Arrays.copyOf(buf, p);
}
private static char[][] nm(int n, int m) {
char[][] map = new char[n][];
for (int i = 0; i < n; i++)
map[i] = ns(m);
return map;
}
private static int[] na(int n) {
int[] a = new int[n];
for (int i = 0; i < n; i++)
a[i] = ni();
return a;
}
private static int ni() {
int num = 0, b;
boolean minus = false;
while ((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'))
;
if (b == '-') {
minus = true;
b = readByte();
}
while (true) {
if (b >= '0' && b <= '9') {
num = num * 10 + (b - '0');
} else {
return minus ? -num : num;
}
b = readByte();
}
}
private static long nl() {
long num = 0;
int b;
boolean minus = false;
while ((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'))
;
if (b == '-') {
minus = true;
b = readByte();
}
while (true) {
if (b >= '0' && b <= '9') {
num = num * 10 + (b - '0');
} else {
return minus ? -num : num;
}
b = readByte();
}
}
private static void tr(Object... o) {
if (INPUT.length() != 0)
System.out.println(Arrays.deepToString(o));
}
}