Check some

public static boolean checkDuplicateWithinK(int[][] mat, int k){
    class Cell{
        int row;
        int col;
        public Cell(int r, int c){
            this.row = r;
            this.col = c;
        }
    }
    int n = mat.length;
    int m = mat[0].length;
    k = Math.min(k, n*m);
    //map from distance to cell postions of the matrix
    Map> map = new HashMap>();
    for(int i = 0; i  k){
                        map.remove(c);
                    }
                }
                map.get(mat[i][j]).add(new Cell(i, j));
            }
            else{
                map.put(mat[i][j], new HashSet());
                map.get(mat[i][j]).add(new Cell(i, j));
            }
        }
    }
    return false;
}

public boolean checkDuplicatesWithinK(int[][] matrix, int k) {
        //convert matrix to an array
        int[] arr = Arrays.stream(matrix)
                .flatMapToInt(Arrays::stream)
                .toArray();


        // Creates an empty hashset
        HashSet set = new HashSet();

        // Traverse the input array
        for (int i = 0; i = k)
                set.remove(arr[i - k]);
        }


        return false;
    }

关键字：java, int, mat, arr

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