Submission #19435429


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import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.NoSuchElementException;

public class Main {

	static long mod = 1000000007;
	static int inf = Integer.MAX_VALUE-1;
	static long infL = 0xfffffffffffffffL;

	public static void main(String[] args) {
		FastScanner sc = new FastScanner(System.in);
		int n = sc.nextInt();

		if(n <= 2) {
			System.out.println("POSSIBLE");
			return;
		}

		int[] p = new int[n];
		p[0] = 0;
		for(int i = 1; i < n; i++) {
			p[i] = sc.nextInt()-1;
		}
		int[] x = new int[n];
		for(int i = 0; i < n; i++) {
			x[i] = sc.nextInt();
		}

		boolean[] f = new boolean[n];
		int[][] dp = new int[n][5001];
		for(int i = 0; i < n-1; i++) {
			Arrays.fill(dp[i], -1);
		}

		for(int i = n-1; i > 0; i--) {
			int o = p[i];



			if(!f[i]) {

				if(!f[o]) {
					f[o] = true;
					dp[o][x[i]] = 0;
					dp[o][0] = x[i];
				}else {
					for(int j = 5000; j >= 0; j--) {
						if(dp[o][j] == -1)
							continue;




						int tmp = dp[o][j];
						dp[o][j] = -1;
						if(j <= 5000)
							dp[o][j] = x[i] + tmp;
						if(x[i]+j <= 5000)
							dp[o][x[i]+j] = tmp;
					}
				}

			}else {
				int min = 10000;
				for(int j = 0; j <= x[i]; j++) {
					if(dp[i][j] != -1 && min > dp[i][j])
						min = dp[i][j];
				}
				if(min == 10000) {
					System.out.println("IMPOSSIBLE");
					return;
				}
				if(min > 5000) {
					System.out.println("WA");
					return;
				}

				if(!f[o]) {
					f[o] = true;

					dp[o][x[i]] = min;
					dp[o][min] = x[i];

				}else {

					for(int j = 5000; j >= 0; j--) {
						if(dp[o][j] == -1) {
							dp[o][j] = -1;
							continue;
						}

						int tmp = dp[o][j];
						dp[o][j] = -1;
						if(min+j <= 5000)
							dp[o][min+j] = x[i]+tmp;
						if(x[i]+j <= 5000)
							dp[o][x[i]+j] = min+tmp;

					}
				}
			}
		}

		String ans = "IMPOSSIBLE";
		for(int i = 0; i <= x[0]; i++) {
			if(dp[0][i] != -1) {
				ans = "POSSIBLE";
				break;
			}
		}

		System.out.println(ans);

	}

	private static int binarySearch2D(long key, long[][] ps, int ind, int fromIndex, int toIndex) {

		int low = fromIndex;
		int high = toIndex - 1;

		while (low <= high) {
		int mid = (low + high) >>> 1;
		long midVal = ps[mid][ind];

		if (midVal < key)
			low = mid + 1;
		else if (midVal > key)
			high = mid - 1;
		else
			return mid; // key found
		}
		return -(low + 1);  // key not found.
	}
}

class Pair{
	int v;
	long h;

	public Pair(int v, long h) {
		this.v = v;
		this.h = h;
	}
}

class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    public FastScanner(InputStream in2) {
		// TODO 自動生成されたコンストラクター・スタブ
	}
	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());}
}

Submission Info

Submission Time
Task E - Bichrome Tree
User kiruto398
Language Java (OpenJDK 11.0.6)
Score 0
Code Size 4907 Byte
Status WA
Exec Time 172 ms
Memory 66700 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 0 / 700
Status
AC × 4
AC × 41
WA × 3
Set Name Test Cases
Sample subtask0_0.txt, subtask0_1.txt, subtask0_2.txt, subtask0_3.txt
All 01.txt, 02.txt, 03.txt, 04.txt, 05.txt, 06.txt, 07.txt, 08.txt, 09.txt, 10.txt, 11.txt, 12.txt, 13.txt, 14.txt, 15.txt, 16.txt, 17.txt, 18.txt, 19.txt, 20.txt, 21.txt, 22.txt, 23.txt, 24.txt, 25.txt, 26.txt, 27.txt, 28.txt, 29.txt, 30.txt, 31.txt, 32.txt, 33.txt, 34.txt, 35.txt, 36.txt, 37.txt, 38.txt, 39.txt, 40.txt, subtask0_0.txt, subtask0_1.txt, subtask0_2.txt, subtask0_3.txt
Case Name Status Exec Time Memory
01.txt AC 161 ms 65928 KB
02.txt WA 134 ms 65460 KB
03.txt AC 96 ms 63336 KB
04.txt AC 147 ms 66008 KB
05.txt AC 145 ms 65880 KB
06.txt AC 139 ms 65868 KB
07.txt AC 140 ms 65864 KB
08.txt AC 161 ms 66412 KB
09.txt AC 159 ms 66536 KB
10.txt AC 103 ms 63168 KB
11.txt WA 130 ms 64468 KB
12.txt AC 123 ms 44888 KB
13.txt AC 123 ms 65020 KB
14.txt AC 143 ms 66052 KB
15.txt AC 146 ms 65976 KB
16.txt AC 150 ms 65824 KB
17.txt AC 100 ms 63128 KB
18.txt AC 105 ms 63352 KB
19.txt AC 147 ms 66100 KB
20.txt AC 144 ms 66104 KB
21.txt WA 126 ms 64488 KB
22.txt AC 102 ms 63232 KB
23.txt AC 159 ms 66352 KB
24.txt AC 162 ms 66400 KB
25.txt AC 172 ms 66700 KB
26.txt AC 142 ms 65692 KB
27.txt AC 138 ms 65152 KB
28.txt AC 131 ms 64848 KB
29.txt AC 138 ms 65912 KB
30.txt AC 138 ms 64864 KB
31.txt AC 138 ms 66064 KB
32.txt AC 146 ms 65888 KB
33.txt AC 95 ms 63296 KB
34.txt AC 105 ms 63364 KB
35.txt AC 103 ms 63148 KB
36.txt AC 104 ms 63280 KB
37.txt AC 99 ms 63272 KB
38.txt AC 98 ms 63116 KB
39.txt AC 96 ms 63116 KB
40.txt AC 103 ms 63248 KB
subtask0_0.txt AC 75 ms 32188 KB
subtask0_1.txt AC 64 ms 31992 KB
subtask0_2.txt AC 75 ms 32252 KB
subtask0_3.txt AC 74 ms 32076 KB