結果

問題 No.788 トラックの移動
コンテスト
ユーザー Oland
提出日時 2019-05-24 12:16:25
言語 Java
(openjdk 23)
結果
AC  
実行時間 931 ms / 2,000 ms
コード長 5,604 bytes
記録
記録タグの例:
初AC ショートコード 純ショートコード 純主流ショートコード 最速実行時間
コンパイル時間 2,787 ms
コンパイル使用メモリ 81,172 KB
実行使用メモリ 48,960 KB
最終ジャッジ日時 2024-12-15 07:05:32
合計ジャッジ時間 9,523 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge2
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 14
権限があれば一括ダウンロードができます

ソースコード

diff #
raw source code 

import java.io.*;
import java.util.*;
import java.util.Map.Entry;

@SuppressWarnings("unused")
public class Main {
	
	//final boolean isDebug = true;
	final boolean isDebug = false;
	String fileName = "input.txt";
	FastScanner sc;
	PrintWriter out;
	final int MOD = (int)1e9+7;
	//final int INF = Integer.MAX_VALUE / 2;
	final long INF = Long.MAX_VALUE / 2;
	
	void solve() throws Exception{
		int N = sc.nextInt(), M = sc.nextInt(), L = sc.nextInt()-1;
		int[] num = new int[N];
		for(int i = 0; i < N; i++) num[i] = sc.nextInt();
		ArrayList<ArrayList<Edge>> G = new ArrayList<>();
		for(int i = 0; i < N; i++) G.add(new ArrayList<>());
		for(int i = 0; i < M; i++){
			int a = sc.nextInt()-1, b = sc.nextInt()-1;
			int c = sc.nextInt();
			G.get(a).add(new Edge(a, b, c));
			G.get(b).add(new Edge(b, a, c));
		}
		long[] distL = dijkstra(G, L);
		
		long min = Long.MAX_VALUE / 2;
		for(int i = 0; i < N; i++){
			long[] dist = dijkstra(G, i);
			
			int K = -1;
			long d = 0;
			for(int j = 0; j < N; j++){
				if(num[j] != 0 && d < dist[j] - distL[j]){
					K = j; d = dist[j] - distL[j];
				}
			}
			
			long sum = 0;
			if(K != -1){
				for(int j = 0; j < N; j++){
					if(j == K){
						sum += distL[K] + dist[K];
						sum += dist[K] * 2 * (num[K] - 1);
					}else if(num[j] >= 1){
						sum += dist[j] * 2 * num[j];
					}
				}
			}else{
				sum += dist[L];
				for(int j = 0; j < N; j++){
					sum += dist[j] * 2 * num[j];
				}
				if(sum == dist[L]) sum = 0;
			}
			
			min = Math.min(min, sum);
		}
		System.out.println(min);
 	}
	
	long[] dijkstra(ArrayList<ArrayList<Edge>> G, int start){
		long INF = Long.MAX_VALUE / 2;
		long[] dist = new long[G.size()];
		Arrays.fill(dist, INF);
		dist[start] = 0;
		PriorityQueue<Node> priorityQueue = new PriorityQueue<Node>();
		priorityQueue.add(new Node(start, 0));
		
		while(!priorityQueue.isEmpty()){
			Node node = priorityQueue.poll();
			if(dist[node.index] < node.cost) continue;
			for(Edge e : G.get(node.index)){
				if(dist[e.to] > dist[node.index] + e.cost){
					dist[e.to] = dist[node.index] + e.cost;
					priorityQueue.add(new Node(e.to, dist[e.to]));
				}
			}
		}
		
		return dist;
	}
	
	/* end solve */
	
	/* main */
	public static void main(String[] args) throws Exception {
		new Main().m();
	}
	
	void m() throws Exception {
		long S = System.currentTimeMillis();
		sc = (isDebug) ? new FastScanner(new FileInputStream(fileName)) : new FastScanner(System.in);
		out = new PrintWriter(System.out);
		solve();
		out.flush();
		long G = System.currentTimeMillis();
		if(isDebug){
			System.out.println("---Debug---");
			System.out.printf("%8d ms\n", (G-S));
		}
	}
	/* end main */
}
/* end Main */

class Node implements Comparable<Node>{
	int index;
	long cost;
	public Node(int i, long c){
		index = i; cost = c;
	}
	@Override
	public int compareTo(Node o) {
		return Long.compare(this.cost, o.cost);
	}
}

class Edge implements Comparable<Edge>{
	int from;
	int to;
	long cost;
	public Edge(int f, int t, long c){
		from = f;to = t;cost = c;
	}
	@Override
	public int compareTo(Edge o) {
		return Long.compare(this.cost, o.cost);
	}
}

class FastScanner {
    private InputStream in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    public FastScanner(InputStream in) {
		this.in = in;
	}
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        }else{
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
    private int readByte() {
    	if (hasNextByte()) return buffer[ptr++];
    	else return -1;
    }
    private static boolean isPrintableChar(int c){
    	return 33 <= c && c <= 126;
    }
    public boolean hasNext() {
    	while(hasNextByte() && !isPrintableChar(buffer[ptr]))
    		ptr++; return hasNextByte();
    }
    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public String nextLine() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(b != 10) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
        return (int) nl;
    }
    public double nextDouble() {
    	return Double.parseDouble(next());
    }
}
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