public class Solution {
    public int[,] MatrixReshape(int[,] nums, int r, int c) {
        if (nums.Length < r * c) return nums;
            int[,] result = new int[r,c];
            List<int> temp = new List<int>();
            //先放到集合里
            foreach (var item in nums)
            {
                temp.Add(item);
            }
            int k = 0;
            for (int i = 0; i < r; i++)
            {
                for (int j = 0; j < c; j++)
                {
                    result[i, j] = temp[k++];
                }
            }
            return result;
    }
}