View Compilation Error

0_0_39099163_26394.cpp: In function 'int main()':
0_0_39099163_26394.cpp:16:38: error: expected ')' before '{' token
   16 |         while(next_permutation(a,a+n)
      |              ~                       ^
      |                                      )
   17 |         {
      |         ~