private static boolean issquare ( long t ) {
  long low = 1 ;
  long high = Integer . MAX_VALUE ;
  while ( low <= high ) {
    long mid = ( low + high ) / 2 ;
    long v = mid * mid ;
    if ( v == t ) {
      return true ;
    }
    if ( v < t ) {
      low = mid + 1 ;
    }
    else {
      high = mid - 1 ;
    }
  }
  return false ;
}

private static boolean issquare ( long t ) { long low = 1 ; long high = Integer . MAX_VALUE ; while ( low <= high ) { long mid = ( low + high ) / 2 ; long v = mid * mid ; if ( v == t ) { return true ; } if ( v < t ) { low = mid + 1 ; } else { high = mid - 1 ; } } return false ; }
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