static int minimumDeletions ( int a [ ] , int n ) {
  if ( n <= 2 ) return 0 ;
  int count = 0 ;
  for ( int i = 0 ;
  i < n - 2 ;
  i ++ ) {
    if ( ( a [ i ] < a [ i + 1 ] && a [ i + 1 ] < a [ i + 2 ] ) || ( a [ i ] > a [ i + 1 ] && a [ i + 1 ] > a [ i + 2 ] ) ) count ++ ;
  }
  return count ;
}

static int minimumDeletions ( int a [ ] , int n ) { if ( n <= 2 ) return 0 ; int count = 0 ; for ( int i = 0 ; i < n - 2 ; i ++ ) { if ( ( a [ i ] < a [ i + 1 ] && a [ i + 1 ] < a [ i + 2 ] ) || ( a [ i ] > a [ i + 1 ] && a [ i + 1 ] > a [ i + 2 ] ) ) count ++ ; } return count ; }
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