結果

問題 No.343 手抜き工事のプロ
ユーザー uwiuwi
提出日時 2016-02-12 22:40:36
言語 Java21
(openjdk 21)
結果
AC  
実行時間 95 ms / 2,000 ms
コード長 3,317 bytes
コンパイル時間 4,124 ms
コンパイル使用メモリ 89,708 KB
実行使用メモリ 51,876 KB
最終ジャッジ日時 2024-09-22 04:44:42
合計ジャッジ時間 6,390 ms
ジャッジサーバーID
(参考情報)
judge2 / judge5
このコードへのチャレンジ
(要ログイン)

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 52 ms
50,044 KB
testcase_01 AC 52 ms
50,252 KB
testcase_02 AC 52 ms
50,268 KB
testcase_03 AC 51 ms
50,044 KB
testcase_04 AC 53 ms
50,244 KB
testcase_05 AC 52 ms
49,800 KB
testcase_06 AC 52 ms
50,256 KB
testcase_07 AC 50 ms
50,276 KB
testcase_08 AC 51 ms
50,284 KB
testcase_09 AC 52 ms
50,044 KB
testcase_10 AC 51 ms
50,148 KB
testcase_11 AC 51 ms
50,304 KB
testcase_12 AC 52 ms
50,108 KB
testcase_13 AC 56 ms
50,256 KB
testcase_14 AC 52 ms
50,276 KB
testcase_15 AC 52 ms
50,156 KB
testcase_16 AC 54 ms
50,272 KB
testcase_17 AC 51 ms
50,116 KB
testcase_18 AC 51 ms
50,248 KB
testcase_19 AC 52 ms
50,016 KB
testcase_20 AC 56 ms
50,136 KB
testcase_21 AC 79 ms
50,900 KB
testcase_22 AC 77 ms
50,924 KB
testcase_23 AC 86 ms
51,316 KB
testcase_24 AC 89 ms
51,536 KB
testcase_25 AC 95 ms
51,480 KB
testcase_26 AC 93 ms
51,876 KB
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ソースコード

diff #

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.InputMismatchException;

public class C {
	InputStream is;
	PrintWriter out;
	String INPUT = "";
	
	void solve()
	{
		int n = ni();
		int L = ni();
		int[] x = new int[n];
		for(int i = 1;i < n;i++)x[i] = ni();
		for(int i = 0;i < n-1;i++){
			if(Math.abs(x[i+1] - x[i]) >= L){
				out.println(-1);
				return;
			}
		}
		
		long w = 0;
		int num = n-1;
		for(int i = n-1;i >= 0;i--){
			if(i <= n-2){
				// a[i] < w/2/(n-1-i) < a[i]+L
				if(
						x[i] * 2L * (n-1-i) < w && w < (x[i] + L) * 2L * (n-1-i) &&
						x[i+1] * 2L * (n-1-i) < w && w < (x[i+1] + L) * 2L * (n-1-i)
						){
					num--;
				}
			}
			w += x[i] + x[i] + L;
		}
		out.println(num);
	}
	
	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 C().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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