Language: Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Comparator;
import java.util.StringJoiner;
import java.util.StringTokenizer;
import java.util.function.IntUnaryOperator;
import java.util.function.LongUnaryOperator;

import static com.yu212.Utils.println;

public class Main {
    static In in = new In();
    static Out out = new Out();
    static final long mod = 1000000007;
    static final long inf = 0xfffffffffffffffL;
    static final int iinf = 0xfffffff;
    static final int[] da = {-1, 0, 1, 0, -1, 1, 1, -1, -1};

    void solve() {
        int n = in.nextInt();
        int[] a = in.nextIntArray(n);
        int[] b = new int[n];
        for (int i = 0; i < n; i++) {
            b[i] = i;
        }
        sort(b, Comparator.comparingInt(i -> -a[i]));
        long[][] dp = new long[n + 1][n + 1];
        for (int i = 0; i <= n; i++) {
            Arrays.fill(dp[i], -iinf);
            dp[i][0] = 0;
        }
        for (int i = 0; i < n; i++) {
            for (int j = 0; j <= i; j++) {
                int r = n - 1 - j;
                int l = i - j;
                println(i, j, r, l);
                dp[i + 1][j] = Math.max(dp[i + 1][j], dp[i][j] + (a[b[i]] * Math.abs(b[i] - l)));
                dp[i + 1][j + 1] = Math.max(dp[i + 1][j + 1], dp[i][j] + (a[b[i]] * Math.abs(b[i] - r)));
            }
        }
        Arrays.stream(dp[n]).max().ifPresent(System.out::println);
    }

    void sort(int[] a, Comparator<Integer> comparator) {
        Integer[] b = new Integer[a.length];
        for (int i = 0; i < a.length; i++) {
            b[i] = a[i];
        }
        Arrays.sort(b, comparator);
        for (int i = 0; i < a.length; i++) {
            a[i] = b[i];
        }
    }

    public static void main(String[]$) {
        new Main().solve();
        out.flush();
    }
}

class In {
    private BufferedReader reader = new BufferedReader(new InputStreamReader(System.in), 0x10000);
    private StringTokenizer tokenizer;

    String next() {
        try {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                tokenizer = new StringTokenizer(reader.readLine());
            }
        } catch (IOException ignored) {
        }
        return tokenizer.nextToken();
    }

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

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

    char[][] nextCharArray(int n, int m) {
        char[][] a = new char[n][m];
        for (int i = 0; i < n; i++) {
            a[i] = next().toCharArray();
        }
        return a;
    }

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

    int[] nextIntArray(int n, IntUnaryOperator op) {
        int[] a = new int[n];
        for (int i = 0; i < n; i++) {
            a[i] = op.applyAsInt(nextInt());
        }
        return a;
    }

    long[] nextLongArray(int n) {
        long[] a = new long[n];
        for (int i = 0; i < n; i++) {
            a[i] = nextLong();
        }
        return a;
    }

    long[] nextLongArray(int n, LongUnaryOperator op) {
        long[] a = new long[n];
        for (int i = 0; i < n; i++) {
            a[i] = op.applyAsLong(nextLong());
        }
        return a;
    }
}

class Out {
    private PrintWriter out = new PrintWriter(System.out);
    boolean autoFlush = false;

    void println(Object... a) {
        StringJoiner joiner = new StringJoiner(" ");
        for (Object obj : a) {
            joiner.add(String.valueOf(obj));
        }
        out.println(joiner);
        if (autoFlush) {
            out.flush();
        }
    }

    void println(int[] a) {
        StringJoiner joiner = new StringJoiner(" ");
        for (int i : a) {
            joiner.add(Integer.toString(i));
        }
        out.println(joiner);
        if (autoFlush) {
            out.flush();
        }
    }

    void println(long[] a) {
        StringJoiner joiner = new StringJoiner(" ");
        for (long i : a) {
            joiner.add(Long.toString(i));
        }
        out.println(joiner);
        if (autoFlush) {
            out.flush();
        }
    }

    void flush() {
        out.flush();
    }
}


Compiler output:
Main.java:12: error: package com.yu212 does not exist
import static com.yu212.Utils.println;
                       ^
Main.java:12: error: static import only from classes and interfaces
import static com.yu212.Utils.println;
^
Main.java:39: error: cannot find symbol
                println(i, j, r, l);
                ^
  symbol:   method println(int,int,int,int)
  location: class Main
3 errors