public static int extendedEuclid ( int a , int b ) {
  if ( b == 0 ) {
    x = 1 ;
    y = 0 ;
    return a ;
  }
  int f = extendedEuclid ( b , a % b ) ;
  int t = x ;
  x = y ;
  y = t - ( a / b ) * y ;
  return f ;
}

public static int extendedEuclid ( int a , int b ) { if ( b == 0 ) { x = 1 ; y = 0 ; return a ; } int f = extendedEuclid ( b , a % b ) ; int t = x ; x = y ; y = t - ( a / b ) * y ; return f ; }
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