无法找出哪些测试案例导致spoj问题BYTESM2中的WA

Question

这是代码。它适用于单行，单列以及整个零行或列测试用例。

import java.util.Scanner;
class SpojBytesMTwo {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int t = Integer.parseInt(sc.nextLine());
        while(t-->0) {
            String s[] = (sc.nextLine()).split(" ");
            int r=Integer.parseInt(s[0]);
            int c = Integer.parseInt(s[1]);
            int [][]arr = new int[r][c];
            for (int i = 0; i < r; i++) {
                String s1[] = (sc.nextLine()).split(" ");
                for (int j = 0; j < c; j++) {
                    arr[i][j]= Integer.parseInt(s1[j]);
                }
            }

            //populated the array above
            if(!(r==1 || c==1)) {
                // handle single row or column case separately
                for (int i = r-2; i>=0; i--) {
                    for (int j = 0; j < c; j++) {
                        if(j==0) {
                            arr[i][j] += Math.max(arr[i+1][j],arr[i+1][j+1]);
                        }
                        else if(j==c-1) {
                            arr[i][j] += Math.max(arr[i+1][j-1],arr[i+1][j]);
                        }
                        else {
                            arr[i][j] += Math.max(arr[i+1][j-1],Math.max(arr[i+1][j],arr[i+1][j+1]));
                        }
                    }
                }
            }
            int big = arr[0][0];
            //calculating the biggest sum

            //checking the first row for this 
            if(c>1) {
                for (int j = 1; j < c; j++) {
                    if(arr[0][j]>big) {
                        big = arr[0][j];
                    }
                }
            }
            else {
                for(int i=1;i<r;i++)
                    big += arr[i][0];
            }
            System.out.println(big);             
        }
    }    
}

有人可以建议其他可能给我错误答案的测试用例吗？