static void maxCircularSum ( int [ ] arr , int n , int k ) {
  if ( n < k ) {
    System . out . println ( "Invalid" ) ;
    return ;
  }
  int sum = 0 , start = 0 , end = k - 1 ;
  for ( int i = 0 ;
  i < k ;
  i ++ ) sum += arr [ i ] ;
  int ans = sum ;
  for ( int i = k ;
  i < n + k ;
  i ++ ) {
    sum += arr [ i % n ] - arr [ ( i - k ) % n ] ;
    if ( sum > ans ) {
      ans = sum ;
      start = ( i - k + 1 ) % n ;
      end = i % n ;
    }
  }
  System . out . println ( "max circular sum = " + ans ) ;
  System . out . println ( "start index = " + start + "\nend index = " + end ) ;
}

static void maxCircularSum ( int [ ] arr , int n , int k ) { if ( n < k ) { System . out . println ( " Invalid " ) ; return ; } int sum = 0 , start = 0 , end = k - 1 ; for ( int i = 0 ; i < k ; i ++ ) sum += arr [ i ] ; int ans = sum ; for ( int i = k ; i < n + k ; i ++ ) { sum += arr [ i % n ] - arr [ ( i - k ) % n ] ; if ( sum > ans ) { ans = sum ; start = ( i - k + 1 ) % n ; end = i % n ; } } System . out . println ( " max ▁ circular ▁ sum ▁ = ▁ " + ans ) ; System . out . println ( " start ▁ index ▁ = ▁ " + start + " \n end ▁ index ▁ = ▁ " + end ) ; }
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