public static int find ( int k , int x ) {
  int low = 1 ;
  int up = k ;
  while ( low < up ) {
    int mid = ( low + up ) / 2 ;
    if ( a [ mid ] <= x ) low = mid + 1 ;
    else up = mid ;
  }
  return low ;
}

public static int find ( int k , int x ) { int low = 1 ; int up = k ; while ( low < up ) { int mid = ( low + up ) / 2 ; if ( a [ mid ] <= x ) low = mid + 1 ; else up = mid ; } return low ; }
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