結果
| 問題 |
No.1054 Union add query
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2019-11-09 02:27:21 |
| 言語 | Java (openjdk 23) |
| 結果 |
AC
|
| 実行時間 | 453 ms / 2,000 ms |
| コード長 | 3,348 bytes |
| コンパイル時間 | 3,480 ms |
| コンパイル使用メモリ | 77,944 KB |
| 実行使用メモリ | 58,560 KB |
| 最終ジャッジ日時 | 2024-11-27 23:56:55 |
| 合計ジャッジ時間 | 6,857 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge5 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 8 |
ソースコード
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.NoSuchElementException;
public class Main {
class DJSet {
int n;
int[] upper;
long[] weight;
public DJSet(int n) {
this.n = n;
upper = new int[n];
weight = new long[n];
Arrays.fill(upper, -1);
}
void add_weight(int x, long w) {
x = root(x);
weight[x] += w;
}
long get_weight(int x) {
return weight[x] + (upper[x] < 0 ? 0 : get_weight(upper[x]));
}
int root(int x) {
return upper[x] < 0 ? x : root(upper[x]);
}
boolean equiv(int x, int y) {
return root(x) == root(y);
}
void setUnion(int x, int y) {
x = root(x);
y = root(y);
if (x == y)
return;
if (upper[x] < upper[y]) {
x ^= y;
y ^= x;
x ^= y;
}
upper[y] += upper[x];
upper[x] = y;
weight[x] -= weight[y];
}
}
void run() {
FastScanner sc = new FastScanner();
int N = sc.nextInt();
int Q = sc.nextInt();
DJSet ds = new DJSet(N);
PrintWriter pw = new PrintWriter(System.out);
for (int q = 0; q < Q; ++q) {
int T = sc.nextInt();
int A = sc.nextInt();
int B = sc.nextInt();
--A;
if (T == 1) {
--B;
if (ds.equiv(A, B))
continue;
ds.setUnion(A, B);
} else if (T == 2) {
ds.add_weight(A, B);
} else if (T == 3) {
pw.println(ds.get_weight(A));
}
}
pw.close();
}
public static void main(String[] args) throws FileNotFoundException {
new Main().run();
}
void tr(Object... objects) {
System.out.println(Arrays.deepToString(objects));
}
}
class FastScanner {
private final InputStream in = System.in;
private final byte[] buffer = new byte[1024];
private int ptr = 0;
private int buflen = 0;
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 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());
}
}