static double dis ( pair a , pair b ) {
  return Math . sqrt ( ( ( a . x - b . x ) * ( a . x - b . x ) ) + ( ( a . y - b . y ) * ( a . y - b . y ) ) ) ;
}

static double dis ( pair a , pair b ) { return Math . sqrt ( ( ( a . x - b . x ) * ( a . x - b . x ) ) + ( ( a . y - b . y ) * ( a . y - b . y ) ) ) ; }
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