#78434 (Java21) No.348 カゴメカゴメ

提出ソース

結果

問題	No.348 カゴメカゴメ
ユーザー	uwi
提出日時	2016-02-26 22:59:55
言語	Java21 (openjdk 21)
結果	AC
実行時間	617 ms / 2,000 ms
コード長	6,543 bytes
コンパイル時間	4,517 ms
コンパイル使用メモリ	88,236 KB
実行使用メモリ	73,540 KB
最終ジャッジ日時	2024-09-22 22:38:17
合計ジャッジ時間	17,842 ms
ジャッジサーバーID （参考情報）	judge4 / judge3

このコードへのチャレンジ
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テストケース

テストケース表示

入力	結果	実行時間実行使用メモリ
testcase_00	AC	411 ms 62,864 KB
testcase_01	AC	56 ms 50,412 KB
testcase_02	AC	617 ms 73,540 KB
testcase_03	AC	518 ms 65,000 KB
testcase_04	AC	59 ms 50,076 KB
testcase_05	AC	59 ms 49,848 KB
testcase_06	AC	54 ms 49,980 KB
testcase_07	AC	54 ms 50,292 KB
testcase_08	AC	54 ms 50,028 KB
testcase_09	AC	55 ms 50,224 KB
testcase_10	AC	55 ms 49,912 KB
testcase_11	AC	55 ms 50,244 KB
testcase_12	AC	101 ms 52,124 KB
testcase_13	AC	79 ms 51,532 KB
testcase_14	AC	58 ms 50,248 KB
testcase_15	AC	274 ms 61,232 KB
testcase_16	AC	55 ms 50,060 KB
testcase_17	AC	55 ms 50,328 KB
testcase_18	AC	56 ms 50,064 KB
testcase_19	AC	54 ms 50,300 KB
testcase_20	AC	56 ms 50,252 KB
testcase_21	AC	55 ms 50,312 KB
testcase_22	AC	53 ms 50,276 KB
testcase_23	AC	540 ms 64,624 KB
testcase_24	AC	554 ms 65,180 KB
testcase_25	AC	547 ms 65,100 KB
testcase_26	AC	545 ms 64,884 KB
testcase_27	AC	540 ms 65,048 KB
testcase_28	AC	573 ms 65,300 KB
testcase_29	AC	544 ms 64,720 KB
testcase_30	AC	554 ms 64,660 KB
testcase_31	AC	539 ms 64,792 KB
testcase_32	AC	536 ms 64,696 KB
testcase_33	AC	278 ms 54,960 KB
testcase_34	AC	162 ms 52,564 KB
testcase_35	AC	160 ms 52,356 KB
testcase_36	AC	169 ms 53,836 KB
testcase_37	AC	163 ms 52,792 KB
testcase_38	AC	162 ms 53,136 KB
testcase_39	AC	153 ms 53,396 KB
testcase_40	AC	166 ms 53,284 KB
testcase_41	AC	173 ms 54,928 KB
testcase_42	AC	164 ms 52,712 KB
testcase_43	AC	94 ms 52,432 KB
testcase_44	AC	105 ms 52,152 KB
testcase_45	AC	99 ms 52,048 KB
testcase_46	AC	100 ms 52,116 KB
testcase_47	AC	100 ms 51,968 KB
testcase_48	AC	105 ms 52,540 KB
testcase_49	AC	100 ms 52,136 KB
testcase_50	AC	105 ms 52,808 KB
testcase_51	AC	100 ms 51,936 KB
testcase_52	AC	100 ms 52,184 KB

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ソースコード

raw source code

package contest;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.HashSet;
import java.util.InputMismatchException;
import java.util.Set;

public class Q795_2 {
	InputStream is;
	PrintWriter out;
	String INPUT = "";
	
	void solve()
	{
		int n = ni(), m = ni();
		char[][] map = nm(n,m);
		char[][] nmap = new char[n+2][m+2];
		for(int i = 0;i < n+2;i++)Arrays.fill(nmap[i], '.');
		for(int i = 0;i < n;i++){
			for(int j = 0;j < m;j++){
				nmap[i+1][j+1] = map[i][j];
			}
		}
		map = nmap;
		n += 2; m += 2;
		
		DJSet ds = new DJSet(n*m);
		for(int i = 0;i < n;i++){
			for(int j = 0;j < m-1;j++){
				if(map[i][j] == '.' && map[i][j+1] == '.'){
					ds.union(i*m+j, i*m+j+1);
				}
			}
		}
		for(int i = 0;i < n-1;i++){
			for(int j = 0;j < m;j++){
				if(map[i][j] == '.' && map[i+1][j] == '.'){
					ds.union(i*m+j, (i+1)*m+j);
				}
			}
		}
		for(int i = 0;i < n;i++){
			for(int j = 0;j < m;j++){
				for(int k = i-1;k <= i+1;k++){
					for(int l = j-1;l <= j+1;l++){
						if(k >= 0 && k < n && l >= 0 && l < m && map[i][j] == 'x' && map[k][l] == 'x'){
							ds.union(i*m+j, k*m+l);
						}
					}
				}
			}
		}
		
		int z = ds.count();
		Set<Integer> set = new HashSet<Integer>();
		int[] from = new int[z-1];
		int[] to = new int[z-1];
		
		int[] ind = new int[z];
		int[] size = new int[z];
		{
			int p = 0;
			for(int i = 0;i < n*m;i++){
				if(ds.upper[i] < 0){
					ind[p] = i;
					size[p] = -ds.upper[i];
					p++;
				}
			}
		}
		
		int[] dr = { 1, 0, -1, 0 };
		int[] dc = { 0, 1, 0, -1 };
		int p = 0;
		for(int i = 0;i < n;i++){
			for(int j = 0;j < m;j++){
				if(map[i][j] == '.'){
					for(int k = 0;k < 4;k++){
						int nr = i + dr[k], nc = j + dc[k];
						if(nr >= 0 && nr < n && nc >= 0 && nc < m && map[nr][nc] == 'x'){
							int ix = Arrays.binarySearch(ind, ds.root(i*m+j));
							int iy = Arrays.binarySearch(ind, ds.root(nr*m+nc));
							if(set.add(ix*z+iy)){
								from[p] = ix; to[p] = iy;
								p++;
							}
						}
					}
				}
			}
		}
		int[][] g = packU(z, from, to);
		
		int root = ind[ds.root(0)];
		int[] res = dfs(root, -1, g, size);
		out.println(Math.max(res[0], res[1]));
	}
	
	static int[][] packU(int n, int[] from, int[] to) {
		int[][] g = new int[n][];
		int[] p = new int[n];
		for (int f : from)
			p[f]++;
		for (int t : to)
			p[t]++;
		for (int i = 0; i < n; i++)
			g[i] = new int[p[i]];
		for (int i = 0; i < from.length; i++) {
			g[from[i]][--p[from[i]]] = to[i];
			g[to[i]][--p[to[i]]] = from[i];
		}
		return g;
	}
	
	public static void tf(boolean[][] b) {
		for (boolean[] r : b) {
			char[] s = new char[r.length];
			for (int i = 0; i < r.length; i++)
				s[i] = r[i] ? '#' : '.';
			System.out.println(new String(s));
		}
		System.out.println();
	}
	
	static int[] dfs(int cur, int pre, int[][] g, int[] size)
	{
		int n = g.length;
		int r1 = 0;
		int r0 = 0;
		for(int i : g[cur]){
			if(i != pre){
				int v = 0, w = 0;
				int ap = 0;
				for(int j : g[i]){
					if(j != cur){
						int[] res = dfs(j, i, g, size);
						v = Math.max(v, res[1]);
						v = Math.max(v, res[0] + size[i]);
						w = Math.max(w, res[1]);
						w = Math.max(w, res[0]);
						if(++ap > 1)throw new RuntimeException();
					}
				}
				r1 += v;
				r0 += w;
				if(ap == 0){
					r1 += size[i];
				}
			}
		}
		return new int[]{r0, r1};
	}
	
	public static class DJSet {
		public int[] upper;

		public DJSet(int n) {
			upper = new int[n];
			Arrays.fill(upper, -1);
		}

		public int root(int x) {
			return upper[x] < 0 ? x : (upper[x] = root(upper[x]));
		}

		public boolean equiv(int x, int y) {
			return root(x) == root(y);
		}

		public boolean union(int x, int y) {
			x = root(x);
			y = root(y);
			if (x != y) {
				if (upper[y] < upper[x]) {
					int d = x;
					x = y;
					y = d;
				}
				upper[x] += upper[y];
				upper[y] = x;
			}
			return x == y;
		}

		public int count() {
			int ct = 0;
			for (int u : upper)
				if (u < 0)
					ct++;
			return ct;
		}
	}
	
	void run() throws Exception
	{
		is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
		out = new PrintWriter(System.out);
		
		long s = System.currentTimeMillis();
		solve();
		out.flush();
		if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
	}
	
	public static void main(String[] args) throws Exception { new Q795_2().run(); }
	
	private byte[] inbuf = new byte[1024];
	private int lenbuf = 0, ptrbuf = 0;
	
	private int readByte()
	{
		if(lenbuf == -1)throw new InputMismatchException();
		if(ptrbuf >= lenbuf){
			ptrbuf = 0;
			try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
			if(lenbuf <= 0)return -1;
		}
		return inbuf[ptrbuf++];
	}
	
	private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
	private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }
	
	private double nd() { return Double.parseDouble(ns()); }
	private char nc() { return (char)skip(); }
	
	private String ns()
	{
		int b = skip();
		StringBuilder sb = new StringBuilder();
		while(!(isSpaceChar(b))){ // when nextLine, (isSpaceChar(b) && b != ' ')
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}
	
	private char[] ns(int n)
	{
		char[] buf = new char[n];
		int b = skip(), p = 0;
		while(p < n && !(isSpaceChar(b))){
			buf[p++] = (char)b;
			b = readByte();
		}
		return n == p ? buf : Arrays.copyOf(buf, p);
	}
	
	private char[][] nm(int n, int m)
	{
		char[][] map = new char[n][];
		for(int i = 0;i < n;i++)map[i] = ns(m);
		return map;
	}
	
	private int[] na(int n)
	{
		int[] a = new int[n];
		for(int i = 0;i < n;i++)a[i] = ni();
		return a;
	}
	
	private int ni()
	{
		int num = 0, b;
		boolean minus = false;
		while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
		if(b == '-'){
			minus = true;
			b = readByte();
		}
		
		while(true){
			if(b >= '0' && b <= '9'){
				num = num * 10 + (b - '0');
			}else{
				return minus ? -num : num;
			}
			b = readByte();
		}
	}
	
	private long nl()
	{
		long num = 0;
		int b;
		boolean minus = false;
		while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
		if(b == '-'){
			minus = true;
			b = readByte();
		}
		
		while(true){
			if(b >= '0' && b <= '9'){
				num = num * 10 + (b - '0');
			}else{
				return minus ? -num : num;
			}
			b = readByte();
		}
	}
	
	private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); }
}

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結果

テストケース

ソースコード