Help translating c++ code to java in the cutting sticks problem

Im not used to code in java so i need help to translate this code to from c++ to java in a functional way. I tried it myself but the result was always 0. It is the CUTTING STICKS PROBLEM.

#include <iostream>

#define MAXINT 2147483647
#define NCUTS 50
using namespace std;


int main() {

    int len;
    int nc; 
    int arr[NCUTS+2];
    int dp[NCUTS+2][NCUTS+2];

    while((cin >> len) && (len != 0)) {
        cin >> nc;

        for(int i=0; i<nc; i++) {
            cin >> arr[i+1];
        }

        arr[0] = 0;
        nc++;
        arr[nc] = len;

        for(int i=0; i<=NCUTS+1; i++) {
            for(int j=0;j<=NCUTS+1;j++) {
                dp[i][j] = MAXINT;
            }
        }

        for(int i=0; i<=nc; i++) {
            dp[i][i] = 0;
            dp[i][i+1] = 0;
   开发者_如何学Go         dp[i][i+2] = arr[i+2] - arr[i];
        }

        for(int k=3; k<=nc; k++) {
            for(int i=0; i<=nc-k; i++) {
                for(int j=i+1; j<=i+k-1; j++) {
                    if((dp[i][j] + dp[j][i+k] + arr[i+k] - arr[i]) < dp[i][i+k]) {
                        dp[i][i+k] = dp[i][j] + dp[j][i+k] + arr[i+k] - arr[i];
                    }
                }
            }
        }
        cout << "The minimum cutting is "<< dp[0][nc] << "." << endl;
    }
}

---

I won't post the full translation, but some specific differences between C++ and Java that will be relevant here:

• You need to wrap everything in a class, such as public class CuttingSticks.
• Replace #define NAME value with a private static final, for example, private static final int NAME = value;.
• MAXINT is just Integer.MAX_VALUE.
• main must be defined as public static void main(String[] args), even if you don't use args.
• You can't use fixed-size arrays. You must allocate them. For example, int[] arr = new int[NCUTS+2]. There are no 2D arrays, only "arrays of arrays" (you need to allocate the outer array and then allocate another array for each inner array). Alternatively, manually write your own rectangular array.
• Instead of cin, use System.in. This is an InputStream.
• Instead of cout, use System.out. This is a PrintStream -- usually you will just use System.out.println.

---

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

class MyClass {

    static final int MAXINT = Integer.MAX_VALUE;
    static final int NCUTS  = 50;

    public static void main (String [] args) throws IOException {
        int len;
        int nc; 
        int[] arr = new int[NCUTS+2];
        int[][] dp = new int[NCUTS+2][NCUTS+2];

        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        while((len = Integer.parseInt(in.readLine())) != 0) {
            nc = Integer.parseInt(in.readLine());

            for(int i=0; i<nc; i++) {
                arr[i+1] = Integer.parseInt(in.readLine());
            }

            arr[0] = 0;
            nc++;
            arr[nc] = len;

            for(int i=0; i<=NCUTS+1; i++) {
                for(int j=0;j<=NCUTS+1;j++) {
                    dp[i][j] = MAXINT;
                }
            }

            for(int i=0; i<=nc; i++) {
                dp[i][i] = 0;
                dp[i][i+1] = 0;
                dp[i][i+2] = arr[i+2] - arr[i];
            }

            for(int k=3; k<=nc; k++) {
                for(int i=0; i<=nc-k; i++) {
                    for(int j=i+1; j<=i+k-1; j++) {
                        if((dp[i][j] + dp[j][i+k] + arr[i+k] - arr[i]) < dp[i][i+k]) {
                            dp[i][i+k] = dp[i][j] + dp[j][i+k] + arr[i+k] - arr[i];
                        }
                    }
                }
            }
            System.out.println("The minimum cutting is " + dp[0][nc] + ".");
        }
    }
}