Replace In Array

        public static void replaceInArray(ref int[] arr, int find, int replace)
        {
            int[] newArr = getIndices(arr, find);

            for(int i = 0; i < newArr.Length - 1; i++)
            {
                arr[newArr[i]] = replace;
            }
        }

        public static int[] getIndices(int[] arr, int find)
        {
            int[] newArr = new int[arr.Length - 1];
            int count = 0;

            for (int i = 0; i < arr.Length; i++)
            {
                if (arr[i] == find)
                {
                    newArr[i] = i;
                    count++;
                }
            }

            int[] indexArr = new int[count];

            for(int i = 0; i < indexArr.Length; i++)
            {
                indexArr[i] = newArr[i];
            }

            return indexArr;
        }