View Compilation Error

0_0_25189073_23775.cpp: In function 'int main()':
0_0_25189073_23775.cpp:85:31: error: expected ')' before ';' token
  while (~scanf("%d%d\n",&b,&a);) {
                               ^
0_0_25189073_23775.cpp:85:32: error: expected primary-expression before ')' token
  while (~scanf("%d%d\n",&b,&a);) {
                                ^