結果
| 問題 |
No.1054 Union add query
|
| コンテスト | |
| ユーザー |
jp_ste
|
| 提出日時 | 2020-05-17 05:03:39 |
| 言語 | Java (openjdk 23) |
| 結果 |
AC
|
| 実行時間 | 419 ms / 2,000 ms |
| コード長 | 3,110 bytes |
| コンパイル時間 | 2,333 ms |
| コンパイル使用メモリ | 78,456 KB |
| 実行使用メモリ | 68,064 KB |
| 最終ジャッジ日時 | 2024-09-24 12:23:55 |
| 合計ジャッジ時間 | 6,627 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge1 |
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| 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.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.NoSuchElementException;
public class Main {
static FastScanner scan = new FastScanner();
static PrintWriter pw = new PrintWriter(System.out);
static UnionFind union;
static int N, Q;
public static void main(String[] args) {
N = scan.nextInt();
Q = scan.nextInt();
union = new UnionFind(N);
for(int i=0; i<Q; i++) {
int T = scan.nextInt();
int A = scan.nextInt();
int B = scan.nextInt();
if(T == 1) {
if(union.same(A-1, B-1)) continue;
union.unite(A-1, B-1);
} else if(T == 2) {
union.add(A-1, B);
} else if(T == 3) {
pw.println(union.out(A-1));
}
}
pw.close();
}
}
class UnionFind {
int[] L;
long[] V;
UnionFind(int N) {
L = new int[N];
V = new long[N];
Arrays.fill(L, -1);
}
int root(int x) {
return L[x] < 0 ? x : root(L[x]);
}
boolean same(int x, int y) {
return root(x) == root(y);
}
void unite(int x, int y) {
x = root(x);
y = root(y);
if (x == y) {
return;
}
if (L[x] < L[y]) {
int w = x;
x = y;
y = w;
}
L[y] += L[x];
L[x] = y;
V[x] -= V[y];
}
void add(int x, int value) {
x = root(x);
V[x] += value;
}
long out(int x) {
long ans = 0;
while(true){
ans += V[x];
x = L[x];
if(x < 0) break;
}
return ans;
}
}
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());
}
}
jp_ste