private static int search ( int x ) {
  int first = 0 , last = primes . size ( ) - 1 ;
  int result = - 1 ;
  while ( first <= last ) {
    int mid = ( first + last ) / 2 ;
    if ( x <= primes . get ( mid ) ) {
      result = mid ;
      last = mid - 1 ;
    }
    else first = mid + 1 ;
  }
  return result ;
}

private static int search ( int x ) { int first = 0 , last = primes . size ( ) - 1 ; int result = - 1 ; while ( first <= last ) { int mid = ( first + last ) / 2 ; if ( x <= primes . get ( mid ) ) { result = mid ; last = mid - 1 ; } else first = mid + 1 ; } return result ; }
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