java - 我正在尝试这个简单的数独

Question

I am trying a simple sudoku program. i started by taking the values in a 3D array and then copied them into a 1D array by using mr.serpardum's method. i know that there is an error at the point where i am trying to find
duplicate elements,because even if i give same numbers as input the output says "its a sudoku" but i can't to find it...apparently i can't add any image coz i dont have enough credits

    public class SecondAssignment {
    @SuppressWarnings("unused")
    public static void main(String[] args) throws IOException {
    int i = 0, j = 0, k = 0;
    boolean result = false;
    int arr1[][];
    arr1 = new int[3][3];
    int arr2[];
    arr2 = new int[9];
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    System.out.println("Enter the elements in the sudoku block");
    //getting elements into array
    for (i = 0; i < 3; i++) {
        for (j = 0; j < 3; j++) {
            arr1[i][j] = Integer.parseInt(br.readLine());
        }
    }
    //printing it in matrix form
    for (i = 0; i < 3; i++) {
        for (j = 0; j < 3; j++) {
            System.out.print(arr1[i][j] + "\t");
        }
        System.out.println(" ");
    }
    //copying array1 elements into array 2
    for (i = 0; i < 3; i++) { 
        for (j = 0; j < 3; j++) {
            arr2[i * 3 + j] = arr1[i][j];
        }
    }

    //finding duplicate elements
    for (i = 0; i < arr2.length; i++) {
        for (int m = i + 1; m < arr2.length; m++) {
            if (arr2[i] == (arr2[m])) {
                System.out.println("Not a sudoku");
                //result = true;
            } else {
                System.out.println("Its a sudoku");
                //result = false;
            }
          }
      }
  }
}

Answer 1

您可以将代码更新为以下内容

//finding duplicate elements
for( i = 0; i < arr2.length; i++){
 for(int m = i+1; m < arr2.length; m++){
    if(arr2[i] == (arr2[m])){ 
      result = true;
      break;
    }
 }
}  
if(result){
System.out.println("\nNot a sudoku");
}
else{
System.out.println("\nIts a sudoku");
}

您应该在找到匹配项后立即使用中断。此代码仅检查数组(大小为 9)中是否存在重复元素。