Otherwise
return 0 ; } static int count ( StringBuilder a , char c ) { int count = 0 ; for ( int i = 0 ; i < a . length ( ) ; i ++ ) if ( a . charAt ( i ) == c ) count ++ ; return count ; } static void swap ( StringBuilder s1 , int index1 , StringBuilder s2 , int index2 ) { char c = s1 . charAt ( index1 ) ; s1 . setCharAt ( index1 , s2 . charAt ( index2 ) ) ; s2 . setCharAt ( index2 , c ) ; }