static int subarrayCount ( int arr [ ] , int n ) {
  int result = 0 ;
  int fast = 0 , slow = 0 ;
  for ( int i = 1 ;
  i < n ;
  i ++ ) {
    if ( arr [ i ] - arr [ i - 1 ] == 1 ) {
      fast ++ ;
    }
    else {
      int len = fast - slow + 1 ;
      result += len * ( len - 1 ) / 2 ;
      fast = i ;
      slow = i ;
    }
  }
  if ( fast != slow ) {
    int len = fast - slow + 1 ;
    result += len * ( len - 1 ) / 2 ;
  }
  return result ;
}

static int subarrayCount ( int arr [ ] , int n ) { int result = 0 ; int fast = 0 , slow = 0 ; for ( int i = 1 ; i < n ; i ++ ) { if ( arr [ i ] - arr [ i - 1 ] == 1 ) { fast ++ ; } else { int len = fast - slow + 1 ; result += len * ( len - 1 ) / 2 ; fast = i ; slow = i ; } } if ( fast != slow ) { int len = fast - slow + 1 ; result += len * ( len - 1 ) / 2 ; } return result ; }
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