static int modInverse ( int a , int m ) {
  int m0 = m ;
  int y = 0 , x = 1 ;
  if ( m == 1 ) return 0 ;
  while ( a > 1 ) {
    int q = a / m ;
    int t = m ;
    m = a % m ;
    a = t ;
    t = y ;
    y = x - q * y ;
    x = t ;
  }
  if ( x < 0 ) x += m0 ;
  return x ;
}

static int modInverse ( int a , int m ) { int m0 = m ; int y = 0 , x = 1 ; if ( m == 1 ) return 0 ; while ( a > 1 ) { int q = a / m ; int t = m ; m = a % m ; a = t ; t = y ; y = x - q * y ; x = t ; } if ( x < 0 ) x += m0 ; return x ; }
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