/in/Main.java:1: error: class, interface, enum, or record expected
    int[] sum = new int[2 * n + 1];
    ^
/in/Main.java:2: error: class, interface, enum, or record expected
    for (int i = 1; i <= 2 * n; i++) {
    ^
/in/Main.java:2: error: class, interface, enum, or record expected
    for (int i = 1; i <= 2 * n; i++) {
                    ^
/in/Main.java:2: error: class, interface, enum, or record expected
    for (int i = 1; i <= 2 * n; i++) {
                                ^
/in/Main.java:4: error: class, interface, enum, or record expected
    }
    ^
/in/Main.java:7: error: class, interface, enum, or record expected
    int[][] maxDp = new int[2 * n + 1][2 * n + 1];
    ^
/in/Main.java:9: error: class, interface, enum, or record expected
    for (int len = 2; len <= n; len++) {
    ^
/in/Main.java:9: error: class, interface, enum, or record expected
    for (int len = 2; len <= n; len++) {
                      ^
/in/Main.java:9: error: class, interface, enum, or record expected
    for (int len = 2; len <= n; len++) {
                                ^
/in/Main.java:10: error: class, interface, enum, or record expected
        for (int i = 1; i <= 2 * n - len + 1; i++) {
                        ^
/in/Main.java:10: error: class, interface, enum, or record expected
        for (int i = 1; i <= 2 * n - len + 1; i++) {
                                              ^
/in/Main.java:12: error: class, interface, enum, or record expected
            minDp[i][j] = Integer.MAX_VALUE;
            ^
/in/Main.java:13: error: class, interface, enum, or record expected
            maxDp[i][j] = Integer.MIN_VALUE;
            ^
/in/Main.java:14: error: class, interface, enum, or record expected
            int cost = sum[j] - sum[i - 1];
            ^
/in/Main.java:15: error: class, interface, enum, or record expected
            for (int k = i; k < j; k++) {
            ^
/in/Main.java:15: error: class, interface, enum, or record expected
            for (int k = i; k < j; k++) {
                            ^
/in/Main.java:15: error: class, interface, enum, or record expected
            for (int k = i; k < j; k++) {
                                   ^
/in/Main.java:17: error: class, interface, enum, or record expected
                maxDp[i][j] = Math.max(maxDp[i][j], maxDp[i][k] + maxDp[k + 1][j] + cost);
                ^
/in/Main.java:18: error: class, interface, enum, or record expected
            }
            ^
/in/Main.java:23: error: class, interface, enum, or record expected
    int maxAns = Integer.MIN_VALUE;
    ^
/in/Main.java:24: error: class, interface, enum, or record expected
    for (int i = 1; i <= n; i++) {
    ^
/in/Main.java:24: error: class, interface, enum, or record expected
    for (int i = 1; i <= n; i++) {
                    ^
/in/Main.java:24: error: class, interface, enum, or record expected
    for (int i = 1; i <= n; i++) {
                            ^
/in/Main.java:26: error: class, interface, enum, or record expected
        maxAns = Math.max(maxAns, maxDp[i][i + n - 1]);
        ^
/in/Main.java:27: error: class, interface, enum, or record expected
    }
    ^
/in/Main.java:30: error: class, interface, enum, or record expected
    System.out.println(maxAns);
    ^
/in/Main.java:31: error: class, interface, enum, or record expected
}
^
27 errors