/in/foo.cc:5:105: error: extended character 。 is not valid in an identifier
    5 | 优化一：经过Excel实验或理论分析，发现random()函数具有周期性，并且c-1为其周期，所以只要验证前min(2*c,n-1)项即可。
      |                                                                                                         ^
/in/foo.cc:9:40: error: extended character 。 is not valid in an identifier
    9 | 优化二：经过Excel实验或理论分析，在n>c+1时，发现当x与a确定时，b最多只有一个符合要求。
      |                                        ^
/in/foo.cc:13:62: error: extended character 。 is not valid in an identifier
   13 | 优化三：当i>c时，任意数字mod c mod i==该数字mod c，即不需mod i。
      |                                                              ^
/in/foo.cc:14:12: error: extended character 。 is not valid in an identifier
   14 | 提高10%~20%左右效率。
      |            ^
/in/foo.cc:1:8: error: expected constructor, destructor, or type conversion before '(' token
    1 | 以下是O(c^3)的暴力做法（含几处优化），95%的测试点Accept（除了第四个变态的测试点）
      |        ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:36:13: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'long int*' [-Wformat=]
   36 |     scanf("%d%d",&n,&c);
      |            ~^    ~~
      |             |    |
      |             int* long int*
      |            %ld
/in/foo.cc:36:15: warning: format '%d' expects argument of type 'int*', but argument 3 has type 'long int*' [-Wformat=]
   36 |     scanf("%d%d",&n,&c);
      |              ~^     ~~
      |               |     |
      |               int*  long int*
      |              %ld
/in/foo.cc:37:35: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'long int*' [-Wformat=]
   37 |     for (int i=1;i<n;i++) scanf("%d",&ans[i]);
      |                                  ~^  ~~~~~~~
      |                                   |  |
      |                                   |  long int*
      |                                   int*
      |                                  %ld
/in/foo.cc:48:24: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   48 |                 if (i>c&&f!=ans[i]||f%i!=ans[i]) //优化三
      |                     ~~~^~~~~~~~~~~
/in/foo.cc:57:34: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long int' [-Wformat=]
   57 |                         printf("%d %d %d\n",x,a,b);
      |                                 ~^          ~
      |                                  |          |
      |                                  int        long int
      |                                 %ld
/in/foo.cc:57:37: warning: format '%d' expects argument of type 'int', but argument 3 has type 'long int' [-Wformat=]
   57 |                         printf("%d %d %d\n",x,a,b);
      |                                    ~^         ~
      |                                     |         |
      |                                     int       long int
      |                                    %ld
/in/foo.cc:57:40: warning: format '%d' expects argument of type 'int', but argument 4 has type 'long int' [-Wformat=]
   57 |                         printf("%d %d %d\n",x,a,b);
      |                                       ~^        ~
      |                                        |        |
      |                                        int      long int
      |                                       %ld