static long squareRoot ( int n ) {
  int x = n ;
  int y = 1 ;
  while ( x > y ) {
    x = ( x + y ) / 2 ;
    y = n / x ;
  }
  return ( long ) x ;
}

static long squareRoot ( int n ) { int x = n ; int y = 1 ; while ( x > y ) { x = ( x + y ) / 2 ; y = n / x ; } return ( long ) x ; }
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