Submission #993008

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Source Code Expand

import java.io.*;
import java.util.*;

public class Main {
	FastScanner in;
	PrintWriter out;

	void solve() {
		int n = in.nextInt();
		int[] a = new int[n];
		for (int i = 0; i + 1 < n; i++) {
			a[i] = in.nextInt();
		}
		int m = in.nextInt();
		if (m != 1) {
			return;
		}
		a[n - 1] = in.nextInt();
		long[] dp = new long[n];
		dp[n - 2] = a[n - 1];
		for (int opPos = n - 2; opPos >= 1; opPos--) {
			dp[opPos] = Math.max(dp[opPos + 1] - a[opPos + 1], a[opPos + 1]
					- dp[opPos + 1]);
		}
		out.println(dp[1] + a[0] - a[1]);
	}

	void run() {
		try {
			in = new FastScanner(new File("object.in"));
			out = new PrintWriter(new File("object.out"));

			solve();

			out.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
	}

	void runIO() {

		in = new FastScanner(System.in);
		out = new PrintWriter(System.out);

		solve();

		out.close();
	}

	class FastScanner {
		BufferedReader br;
		StringTokenizer st;

		public FastScanner(File f) {
			try {
				br = new BufferedReader(new FileReader(f));
			} catch (FileNotFoundException e) {
				e.printStackTrace();
			}
		}

		public FastScanner(InputStream f) {
			br = new BufferedReader(new InputStreamReader(f));
		}

		String next() {
			while (st == null || !st.hasMoreTokens()) {
				String s = null;
				try {
					s = br.readLine();
				} catch (IOException e) {
					e.printStackTrace();
				}
				if (s == null)
					return null;
				st = new StringTokenizer(s);
			}
			return st.nextToken();
		}

		boolean hasMoreTokens() {
			while (st == null || !st.hasMoreTokens()) {
				String s = null;
				try {
					s = br.readLine();
				} catch (IOException e) {
					e.printStackTrace();
				}
				if (s == null)
					return false;
				st = new StringTokenizer(s);
			}
			return true;
		}

		int nextInt() {
			return Integer.parseInt(next());
		}

		long nextLong() {
			return Long.parseLong(next());
		}

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

	public static void main(String[] args) {
		new Thread(null, new Runnable() {
			public void run() {
				new Main().runIO();
			}
		}, "1", 1 << 26).start();
	}
}

Submission Info

Judge Result