View Compilation Error

0_0_24258948_3298.c: In function 'Partt':
0_0_24258948_3298.c:37:29: error: expected expression before '/' token
   else if (start == end - 1)//only for one point (base)
                             ^
0_0_24258948_3298.c:41:7: error: expected expression before '/' token
   else// other situations
       ^
0_0_24258948_3298.c: In function 'main':
0_0_24258948_3298.c:64:3: error: expected expression before '/' token
   //freopen("output.txt", "r", stdin);
   ^
0_0_24258948_3298.c:68:6: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
      for (int i = 0; i<total; i++)
      ^
0_0_24258948_3298.c:68:6: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_24258948_3298.c:71:34: error: expected expression before '/' token
   double mdp = Partt(0, total-1);//mdp=min dis of pair point
                                  ^