public static int canDo ( int [ ] coast , int R ) {
  int slots_available = 0 ;
  int promotions = 0 ;
  for ( int i = 1 ;
  i < coast . length ;
  ++ i ) {
    if ( coast [ i ] > R ) {
      if ( coast [ i ] - R > slots_available ) {
        return - 1 ;
      }
      int p = ( coast [ i ] - R ) ;
      slots_available -= p ;
      promotions += p ;
    }
    else if ( coast [ i ] == R ) {
    }
    else {
      slots_available += R - coast [ i ] ;
    }
  }
  return promotions ;
}

public static int canDo ( int [ ] coast , int R ) { int slots_available = 0 ; int promotions = 0 ; for ( int i = 1 ; i < coast . length ; ++ i ) { if ( coast [ i ] > R ) { if ( coast [ i ] - R > slots_available ) { return - 1 ; } int p = ( coast [ i ] - R ) ; slots_available -= p ; promotions += p ; } else if ( coast [ i ] == R ) { } else { slots_available += R - coast [ i ] ; } } return promotions ; }
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