結果
| 問題 | 
                            No.1637 Easy Tree Query
                             | 
                    
| コンテスト | |
| ユーザー | 
                             nishi5451
                         | 
                    
| 提出日時 | 2021-08-07 10:35:39 | 
| 言語 | Java  (openjdk 23)  | 
                    
| 結果 | 
                             
                                AC
                                 
                             
                            
                         | 
                    
| 実行時間 | 447 ms / 2,000 ms | 
| コード長 | 2,932 bytes | 
| コンパイル時間 | 2,427 ms | 
| コンパイル使用メモリ | 79,052 KB | 
| 実行使用メモリ | 77,132 KB | 
| 最終ジャッジ日時 | 2024-09-17 14:29:41 | 
| 合計ジャッジ時間 | 16,045 ms | 
| 
                            ジャッジサーバーID (参考情報)  | 
                        judge4 / judge1 | 
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| ファイルパターン | 結果 | 
|---|---|
| sample | AC * 2 | 
| other | AC * 33 | 
ソースコード
import java.util.*;
import java.io.*;
public class Main {
	static final int INF = 1<<30;
	static final long INFL = 1L<<60;
	static final int MOD = 1000000007;
	static final int MOD2 = 998244353;
	static List<List<Integer>> g;
	static int[] dp;
	static void dfs(int v, int pv){
		dp[v] = 1;
		for(int nv : g.get(v)) if(nv != pv){
			dfs(nv,v);
			dp[v] += dp[nv];
		}
	}
	
	public static void main(String[] args) {
		FastScanner fs = new FastScanner();
		PrintWriter pw = new PrintWriter(System.out);
		int n = fs.nextInt();
		int Q = fs.nextInt();
		g = new ArrayList<>();
		for(int i = 0; i < n; i++) g.add(new ArrayList<>());
		for(int i = 0; i < n-1; i++){
			int a = fs.nextInt() - 1;
			int b = fs.nextInt() - 1;
			g.get(a).add(b);
			g.get(b).add(a);
		}
		dp = new int[n];
		dfs(0,-1);
		long ans = 0;
		for(int i = 0; i < Q; i++){
			int p = fs.nextInt() - 1;
			long x = fs.nextLong();
			ans += x*dp[p];
			pw.println(ans);
		}
		pw.close();
	}
}
class FastScanner {
	private InputStream in = System.in;
	private byte[] buffer = new byte[1024];
	private int length = 0, p = 0;
	private boolean hasNextByte() {
		if (p < length) return true;
		else{
			p = 0;
			try{
				length = in.read(buffer);
			}catch(Exception e){
				e.printStackTrace();
			}
			if(length == 0) return false;
		}
		return true;
	}
	private int readByte() {
		if (hasNextByte() == true) return buffer[p++];
		return -1;
	}
	private static boolean isPrintable(int n) {
		return 33 <= n && n <= 126;
	}
	private void skip() {
		while (hasNextByte() && !isPrintable(buffer[p])) p++;
	}
	public boolean hasNext() {
		skip();
		return hasNextByte();
	}
	public String next() {
		if(!hasNext()) throw new NoSuchElementException();
		StringBuilder sb = new StringBuilder();
		int temp = readByte();
		while (isPrintable(temp)) {
			sb.appendCodePoint(temp);
			temp = readByte();
		}
		return sb.toString();
	}
	public int nextInt() {
		return Math.toIntExact(nextLong());
	}
	public int[] nextInts(int n) {
		int[] ar = new int[n];
		for (int i = 0; i < n; i++) ar[i] = nextInt();
		return ar;
	}
	public long[] nextLongs(int n) {
		long[] ar = new long[n];
		for (int i = 0; i < n; i++) ar[i] = nextLong();
		return ar;
	}
	public long nextLong() {
		if(!hasNext()) throw new NoSuchElementException();
		boolean minus = false;
		int temp = readByte();
		if (temp == '-') {
			minus = true;
			temp = readByte();
		}
		if (temp < '0' || '9' < temp) throw new NumberFormatException();
		long n = 0;
		while (isPrintable(temp)) {
			if ('0' <= temp && temp <= '9') {
				n *= 10;
				n += temp - '0';
			}
			temp = readByte();
		}
		return minus ? -n : n;
	}
	public char[] nextChars() {
		String s = next();
		return s.toCharArray();
	}
	public char[][] nextCharMat(int h, int w) {
		char[][] ar = new char[h][w];
		for(int i = 0; i < h; i++){
			String s = next();
			for(int j = 0; j < w; j++){
				ar[i][j] = s.charAt(j);
			}
		}
		return ar;
	}
}
            
            
            
        
            
nishi5451