結果

問題 No.4 おもりと天秤
ユーザー amyuamyu
提出日時 2015-12-09 02:21:17
言語 Java21
(openjdk 21)
結果
AC  
実行時間 52 ms / 5,000 ms
コード長 3,963 bytes
コンパイル時間 2,937 ms
コンパイル使用メモリ 74,240 KB
実行使用メモリ 49,744 KB
最終ジャッジ日時 2023-09-08 16:29:12
合計ジャッジ時間 4,134 ms
ジャッジサーバーID
（参考情報） 		judge12 / judge13
このコードへのチャレンジ（β）

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 43 ms
49,744 KB
testcase_01 AC 43 ms
49,136 KB
testcase_02 AC 42 ms
49,264 KB
testcase_03 AC 43 ms
49,160 KB
testcase_04 AC 43 ms
49,124 KB
testcase_05 AC 49 ms
49,244 KB
testcase_06 AC 42 ms
49,124 KB
testcase_07 AC 48 ms
49,272 KB
testcase_08 AC 42 ms
49,324 KB
testcase_09 AC 52 ms
49,244 KB
testcase_10 AC 50 ms
49,468 KB
testcase_11 AC 43 ms
49,364 KB
testcase_12 AC 46 ms
49,252 KB
testcase_13 AC 46 ms
49,412 KB
testcase_14 AC 47 ms
49,344 KB
testcase_15 AC 45 ms
49,120 KB
testcase_16 AC 43 ms
49,156 KB
testcase_17 AC 43 ms
49,292 KB
testcase_18 AC 48 ms
49,276 KB
testcase_19 AC 49 ms
49,376 KB
testcase_20 AC 50 ms
49,456 KB
testcase_21 AC 49 ms
49,120 KB
testcase_22 AC 49 ms
49,104 KB
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.util.*;
import java.io.*;

public class Main{
    static final Reader sc = new Reader();
    static final PrintWriter out = new PrintWriter(System.out,false);

    public static void main(String[] args) throws Exception {
    	int n = sc.nextInt();
    	int[] w = new int[n];
    	int ans = 0;
    	for(int i=0;i<n;i++){
    		w[i] = sc.nextInt();
    		ans += w[i];
    	}
    	if(ans%2!=0){
    		out.println("impossible");
    	}
    	else{
    		boolean[] judge = new boolean[ans+1];
    		judge[0] = true;
    		for(int i=0;i<n;i++){
    			for(int j=ans/2-1;j>=0;j--){
    				if(judge[j]){
    					judge[j+w[i]] = true;
    				}
    			}
    		}
    		if(judge[ans/2]){
    			out.println("possible");
    		}
    		else{
    			out.println("impossible");
    		}
    	}
    	out.flush();
        sc.close();
        out.close();
    }

    static void trace(Object... o) { System.out.println(Arrays.deepToString(o));}
}

class Reader {

    private final InputStream in;
    private final byte[] buf = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;

    public Reader() { this(System.in);}
    public Reader(InputStream source) { this.in = source;}

    private boolean hasNextByte() {
        if (ptr < buflen) return true;
        ptr = 0;
        try{
            buflen = in.read(buf);
        }catch (IOException e) {e.printStackTrace();}
        if (buflen <= 0) return false;
        return true;
    }

    private int readByte() { if (hasNextByte()) return buf[ptr++]; else return -1;}

    private boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}

    private void skip() { while(hasNextByte() && !isPrintableChar(buf[ptr])) ptr++;}

    public boolean hasNext() {skip(); 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();
        boolean minus = false;
        long num = readByte();

        if(num == '-'){
            num = 0;
            minus = true;
        }else if (num < '0' || '9' < num){
            throw new NumberFormatException();
        }else{
            num -= '0';
        }

        while(true){
            int b = readByte();
            if('0' <= b && b <= '9')
                num = num * 10 + (b - '0');
            else if(b == -1 || !isPrintableChar(b))
                return minus ? -num : num;
            else
                throw new NoSuchElementException();
        }
    }

    public int nextInt() {
        long num = nextLong();
        if (num < Integer.MIN_VALUE || Integer.MAX_VALUE < num)
            throw new NumberFormatException();
        return (int)num;
    }

    public double nextDouble() {
        return Double.parseDouble(next());
    }

    public char nextChar() {
        if (!hasNext()) throw new NoSuchElementException();
        return (char)readByte();
    }

    public String nextLine() {
        while (hasNextByte() && (buf[ptr] == '\n' || buf[ptr] == '\r')) ptr++;
        if (!hasNextByte()) throw new NoSuchElementException();

        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (b != '\n' && b != '\r') {
            sb.appendCodePoint(b);
            b = readByte();
        }

        return sb.toString();
    }

    public int[] nextIntArray(int n) {
        int[] res = new int[n];
        for (int i=0; i<n; i++) res[i] = nextInt();
        return res;
    }

    public char[] nextCharArray(int n) {
        char[] res = new char[n];
        for (int i=0; i<n; i++) res[i] = nextChar();
        return res;
    }

    public void close() {try{ in.close();}catch(IOException e){ e.printStackTrace();}};
}
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