01.程序结构划分

02.去零

有序向量“唯一化”的思路。

        /// <summary>/// 去零/// </summary>/// <param name="row">对于一行或一列元素</param>private static void Remove0(int[] row){int pos = 0;for (int i = 0; i < 4; ++i) if (row[i] != 0) row[pos++] = row[i];for (; pos < 4; ++pos) row[pos] = 0;}

03.合并

        /// <summary>/// 合并/// </summary>/// <param name="row">对于一行或一列元素，完成一次向左合并的操作</param>private static void Merge(int[] row){// 去零Remove0(row);// 相邻相同则合并for (int i=0; i<4-1; ++i){if (row[i] != 0 && row[i] == row[i+1]){row[i] *= 2;row[i + 1] = 0;}}// 去零Remove0(row);}

04.上移

        /// <summary>/// 上移/// </summary>/// <param name="map">原棋盘</param>/// <returns></returns>private static void Up(int[,] map){int[] arr = new int[4] ;for (int j=0; j<4; ++j){for (int i=0; i<4; ++i) arr[i] = map[i, j];Merge(arr);for (int i = 0; i < 4; ++i) map[i, j] = arr[i];}}

05.下移/左移/右移，只是取数据的方向不同

比如，“下移” 取数据和还数据的方向与“上移”相反。

        /// <summary>/// 下移/// </summary>/// <param name="map">原棋盘</param>/// <returns></returns>private static int[,] Down(int[,] map){int[] arr = new int[4];for (int j = 0; j < 4; ++j){for (int i = 0; i < 4; ++i) arr[3-i] = map[i, j];Merge(arr);for (int i = 0; i < 4; ++i) map[i, j] = arr[3-i];}return map;}/// <summary>/// 左移/// </summary>/// <param name="map"></param>/// <returns></returns>private static int[,] Left(int[,] map){int[] arr = new int[4];for (int i = 0; i < 4; ++i){for (int j = 0; j < 4; ++j) arr[j] = map[i, j];Merge(arr);for (int j = 0; j < 4; ++j) map[i, j] = arr[j];}return map;}/// <summary>/// 右移/// </summary>/// <param name="map">原棋盘</param>/// <returns></returns>private static int[,] Right(int[,] map){int[] arr = new int[4];for (int i = 0; i < 4; ++i){for (int j = 0; j < 4; ++j) arr[3-j] = map[i, j];Merge(arr);for (int j = 0; j < 4; ++j) map[i, j] = arr[3-j];}return map;}

06.提高可读性

枚举
enum Direction { up, down, left, right }

        /// <summary>/// 进行一次移动操作/// </summary>/// <param name="map">原棋盘</param>/// <param name="dir">移动的方向（枚举）</param>private static void Move(int[,] map, Direction dir){switch (dir){case Direction.up:Up(map); break;case Direction.down:Down(map); break;case Direction.left:Left(map); break;case Direction.right:Right(map); break;}}