結果
| 問題 |
No.1641 Tree Xor Query
|
| コンテスト | |
| ユーザー |
tenten
|
| 提出日時 | 2022-09-06 14:30:14 |
| 言語 | Java (openjdk 23) |
| 結果 |
AC
|
| 実行時間 | 651 ms / 5,000 ms |
| コード長 | 3,159 bytes |
| コンパイル時間 | 3,331 ms |
| コンパイル使用メモリ | 78,828 KB |
| 実行使用メモリ | 90,184 KB |
| 最終ジャッジ日時 | 2024-11-21 15:54:41 |
| 合計ジャッジ時間 | 7,463 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 18 |
ソースコード
import java.io.*;
import java.util.*;
public class Main {
static ArrayList<ArrayList<Integer>> graph = new ArrayList<>();
static int size = 0;
static int[] starts;
static int[] ends;
public static void main(String[] args) throws Exception {
Scanner sc = new Scanner();
int n = sc.nextInt();
int q = sc.nextInt();
int[] values = new int[n];
for (int i = 0; i < n; i++) {
values[i] = sc.nextInt();
graph.add(new ArrayList<>());
}
for (int i = 0; i < n - 1; i++) {
int a = sc.nextInt() - 1;
int b = sc.nextInt() - 1;
graph.get(a).add(b);
graph.get(b).add(a);
}
starts = new int[n];
ends = new int[n];
setIdx(0, 0);
BinaryIndexedTree bit = new BinaryIndexedTree(size + 1);
for (int i = 0; i < n; i++) {
bit.add(starts[i], values[i]);
}
StringBuilder sb = new StringBuilder();
while (q-- > 0) {
int type = sc.nextInt();
int x = sc.nextInt() - 1;
int y = sc.nextInt();
if (type == 1) {
bit.add(starts[x], y);
} else {
sb.append(bit.getSum(starts[x], ends[x])).append("\n");
}
}
System.out.print(sb);
}
static void setIdx(int i, int p) {
size++;
starts[i] = size;
for (int x : graph.get(i)) {
if (x == p) {
continue;
}
setIdx(x, i);
size++;
}
ends[i] = size;
}
}
class BinaryIndexedTree {
int size;
int[] tree;
public BinaryIndexedTree(int size) {
this.size = size;
tree = new int[size];
}
public void add(int idx, int value) {
int mask = 1;
while (idx < size) {
if ((idx & mask) != 0) {
tree[idx] ^= value;
idx += mask;
}
mask <<= 1;
}
}
public int getSum(int from, int to) {
return getSum(to) ^ getSum(from - 1);
}
public int getSum(int x) {
int mask = 1;
int ans = 0;
while (x > 0) {
if ((x & mask) != 0) {
ans ^= tree[x];
x -= mask;
}
mask <<= 1;
}
return ans;
}
}
class Scanner {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer st = new StringTokenizer("");
StringBuilder sb = new StringBuilder();
public Scanner() throws Exception {
}
public int nextInt() throws Exception {
return Integer.parseInt(next());
}
public long nextLong() throws Exception {
return Long.parseLong(next());
}
public double nextDouble() throws Exception {
return Double.parseDouble(next());
}
public String next() throws Exception {
while (!st.hasMoreTokens()) {
st = new StringTokenizer(br.readLine());
}
return st.nextToken();
}
}
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