結果

問題 No.74 貯金箱の退屈
ユーザー uwiuwi
提出日時 2014-11-20 23:28:33
言語 Java
(openjdk 23)
結果
AC  
実行時間 78 ms / 5,000 ms
コード長 5,290 bytes
コンパイル時間 2,587 ms
コンパイル使用メモリ 84,988 KB
実行使用メモリ 52,320 KB
最終ジャッジ日時 2025-01-02 19:26:39
合計ジャッジ時間 5,824 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge3
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 30
権限があれば一括ダウンロードができます

ソースコード

diff # 

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

public class Main {
	static InputStream is;
	static PrintWriter out;
	static String INPUT = "";
	
	static void solve()
	{
		int n = ni();
		int[] d = na(n);
		int[] w = na(n);
		boolean[] v = new boolean[n];
		boolean[][] m = new boolean[n][n];
		for(int i = 0;i < n;i++){
			m[(i+d[i])%n][i] = m[(i+n*1000-d[i])%n][i] = true;
			v[i] = w[i] == 0;
		}
		Result res = gaussElimination(m, v);
		out.println(res.exists ? "Yes" : "No");
	}
	
	public static Result gaussElimination(boolean[][] M, boolean[] v)
	{
		int n = M.length, m = M[0].length;
		int[] head = new int[n];
		
		// Forward Elimination
		int row = 0;
		for(int col = 0;col < m;col++){
			// select pivot
			boolean pivotFound = false;
			out:
			for(int prow = row;prow < n;prow++){
				if(M[prow][col]){
					// pivot found
					if(prow != row){
						// swap rows
						for(int k = 0;k < m;k++){
							boolean u = M[prow][k]; M[prow][k] = M[row][k]; M[row][k] = u;
						}
						boolean dum = v[prow]; v[prow] = v[row]; v[row] = dum;
					}
					pivotFound = true;
					break out;
				}
			}
			if(!pivotFound)continue;
			head[row] = col;
			
			for(int j = row+1;j < n;j++){
				if(M[j][col]){
					for(int k = col;k < m;k++){
						M[j][k] ^= M[row][k];
					}
					v[j] ^= v[row];
				}
			}
			row++;
		}
		
		Result ret = new Result();
		ret.mat = M;
		for(int i = row;i < n;i++){
			if(v[i]){
				ret.rank = row;
				ret.exists = false;
				return ret;
			}
		}
		
		for(int i = row-1;i >= 0;i--){
			for(int j = i-1;j >= 0;j--){
				if(M[j][head[i]]){
					for(int k = head[i];k < m;k++){
						M[j][k] ^= M[i][k];
					}
					v[j] ^= v[i];
				}
			}
		}
		
		boolean[] retv = new boolean[n];
		for(int i = 0;i < row;i++){
			retv[head[i]] = v[i];
		}
		
		ret.sol = retv;
		ret.rank = row;
		ret.exists = true;
		return ret;
	}
	
	public static class Result
	{
		public boolean[][] mat;
		public boolean[] sol;
		public int rank;
		public boolean exists;
	}
	
	public static void main(String[] args) throws Exception
	{
		long S = System.currentTimeMillis();
		is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
		out = new PrintWriter(System.out);
		
		solve();
		out.flush();
		long G = System.currentTimeMillis();
		tr(G-S+"ms");
	}
	
	private static boolean eof()
	{
		if(lenbuf == -1)return true;
		int lptr = ptrbuf;
		while(lptr < lenbuf)if(!isSpaceChar(inbuf[lptr++]))return false;
		
		try {
			is.mark(1000);
			while(true){
				int b = is.read();
				if(b == -1){
					is.reset();
					return true;
				}else if(!isSpaceChar(b)){
					is.reset();
					return false;
				}
			}
		} catch (IOException e) {
			return true;
		}
	}
	
	private static byte[] inbuf = new byte[1024];
	static int lenbuf = 0, ptrbuf = 0;
	
	private static 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 static boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
	private static int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }
	
	private static double nd() { return Double.parseDouble(ns()); }
	private static char nc() { return (char)skip(); }
	
	private static 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 static 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 static 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 static int[] na(int n)
	{
		int[] a = new int[n];
		for(int i = 0;i < n;i++)a[i] = ni();
		return a;
	}
	
	private static 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 static 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) { if(INPUT.length() != 0)System.out.println(Arrays.deepToString(o)); }
}
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