2048小游戏（C语言版）

 #include <climits>
 #include <cstdio>
 #include <cstring>
 #include <stack>
 #include <string>
 #include <map>
 #include <vector>
 #include <cmath>

 /*
 玩法说明：编译运行后，输入一个整数n，表示自己想玩的游戏中是n*n的表格，现在手机上或者电脑上一般都是4*4的，所以我们可以输入4，回车就可以开始游戏了。

 游戏开始后a s d w表示方向左 下 右 上四个方向。 

 正如真实版的2048一样，会输出两个表格，move 表格显示按输入方向平移后的结果，fill 表格显示又随机填充一个格子后的表格
 */
 using namespace std;

 const int MAXX = ;

 int box[MAXX][MAXX];

 void moveLeft(int n, bool &ret){
     for (int i = ; i < n; ++i){
         for (int j = ; j < n; ++j){
             int k;
             for (k = j - ; k >= ; --k){
                 if (box[i][k] != -){
                     break;
                 }
             }
             box[i][k + ] = box[i][j];

             if ((k + ) != j){
                 box[i][j] = -;
                 ret = true;
             }
         }
     }
 }

 void mergeLeft(int n, bool &ret){
     for (int i = ; i < n; ++i){
         for (int j = ; j < n - ; ++j){
             if (box[i][j] == -)continue;

             if (box[i][j] == box[i][j + ]){
                 box[i][j] *= ;
                 box[i][j + ] = -;
                 ret = true;
                 ++j;
             }
         }
     }
 }

 bool left(int n){
     bool ret = false;
     moveLeft(n, ret);
     mergeLeft(n, ret);
     moveLeft(n, ret);
     return ret;
 }

 void moveRight(int n, bool &ret){
     for (int i = ; i < n; ++i){
         for (int j = n - ; j >= ; --j){
             if (box[i][j] == -)continue;

             int k;
             for (k = j + ; k < n; ++k){
                 if (box[i][k] != -){
                     break;
                 }
             }

             box[i][k - ] = box[i][j];
             if ((k - ) != j){
                 box[i][j] = -;
                 ret = true;
             }
         }
     }
 }

 void mergeRight(int n, bool &ret){
     for (int i = ; i < n; ++i){
         for (int j = n - ; j >; --j){
             if (box[i][j] == -)continue;

             if (box[i][j] == box[i][j - ]){
                 box[i][j] *= ;
                 box[i][j - ] = -;
                 ret = true;
                 --j;
             }
         }
     }
 }

 bool right(int n){
     bool ret = false;
     moveRight(n, ret);
     mergeRight(n, ret);
     moveRight(n, ret);
     return ret;
 }

 void moveUp(int n, bool &ret){
     for (int j = ; j < n; ++j){
         for (int i = ; i < n; ++i){
             int k;
             for (k = i - ; k >= ; --k){
                 if (box[k][j] != -){
                     break;
                 }
             }
             box[k + ][j] = box[i][j];

             if ((k + ) != i){
                 box[i][j] = -;
                 ret = true;
             }
         }
     }
 }

 void mergeUp(int n, bool &ret){
     for (int j = ; j < n; ++j){
         for (int i = ; i < n - ; ++i){
             if (box[i][j] == -)continue;

             if (box[i][j] == box[i + ][j]){
                 box[i][j] *= ;
                 box[i + ][j] = -;
                 ret = true;
                 ++i;
             }
         }
     }
 }

 bool up(int n){
     bool ret = false;
     moveUp(n, ret);
     mergeUp(n, ret);
     moveUp(n, ret);
     return ret;
 }

 void moveDown(int n, bool &ret){
     for (int j = ; j < n; ++j){
         for (int i = n - ; i >= ; --i){
             if (box[i][j] == -)continue;

             int k;
             for (k = i + ; k < n; ++k){
                 if (box[k][j] != -)break;
             }

             box[k - ][j] = box[i][j];

             if ((k - ) != i){
                 box[i][j] = -;
                 ret = true;
             }
         }
     }
 }

 void mergeDown(int n, bool &ret){
     for (int j = ; j < n; ++j){
         for (int i = n - ; i > ; --i){
             if (box[i][j] == -)continue;

             if (box[i][j] == box[i - ][j]){
                 box[i][j] *= ;
                 box[i - ][j] = -;
                 ret = true;
                 --i;
             }
         }
     }
 }

 bool down(int n){
     bool ret = false;
     moveDown(n, ret);
     mergeDown(n, ret);
     moveDown(n, ret);
     return ret;
 }

 void line(int n){
     for (int i = ; i < n; ++i){
         printf("--------");
     }
     printf("-");
     printf("\n");
 }

 void print(int n){
     for (int i = ; i < n; ++i){
         line(n);
         for (int j = ; j < n; ++j){
             printf("|");
             if (box[i][j] == -){
                 printf("\t");
                 continue;
             }

             printf("%2d\t", box[i][j]);
         }
         printf("|");
         printf("\n");
     }
     line(n);
 }

 bool isFull(int n){
     bool mark = true;
     for (int i = ; i < n; ++i){
         for (int j = ; j < n; ++j){
             if (box[i][j] == -){
                 mark = false;
                 return mark;
             }
         }
     }
     return mark;
 }

 bool isOver(int n){
     if (!isFull(n)){
         return false;
     }
     for (int i = ; i < n; ++i){
         for (int j = ; j < n; ++j){
             if (box[i][j] == box[i][j + ] || box[i][j] == box[i + ][j]){
                 return false;
             }
         }
     }
     return true;
 }

 void fillBox(int n){
     int i, j, num;

     if (isFull(n)){
         return;
     }

     while (true){
         i = rand() % n;
         j = rand() % n;
         num = rand() %  ==  ?  : ;

         if (box[i][j] == -){
             box[i][j] = num;
             break;
         }
     }
 }

 int main(){
     //freopen("in.txt", "r", stdin);
     memset(box, -, sizeof(box));

     int n;
     bool mark;
     scanf("%d%*c", &n);

     fillBox(n);
     fillBox(n);
     print(n);

     while (true){
         char ch;
         scanf("%c%*c", &ch);
         if (ch == 'a'){
             mark = left(n);
         }
         else if (ch == 'd'){
             mark = right(n);
         }
         else if (ch == 'w'){
             mark = up(n);
         }
         else if (ch == 's'){
             mark = down(n);
         }
         else{
             continue;
         }
         system("cls");
         printf("Move:\n");
         print(n);
         if (!mark){
             continue;
         }
         fillBox(n);
         printf("Fill:\n");
         print(n);

         if (isOver(n)){
             printf("\n\nGame Over!\n\n");
             break;
         }
     }

     return ;
 }