create map of banned words
for ( int i = 0 ; i < S2 . length ( ) ; i ++ ) { String s = " " ; while ( i < S2 . length ( ) && S2 . charAt ( i ) != ' ▁ ' ) s += S2 . charAt ( i ++ ) ; banned . put ( s , banned . get ( s ) == null ? 1 : banned . get ( s ) + 1 ) ; } HashMap < String , Integer > result = new HashMap < > ( ) ; String ans = " " ; int freq = 0 ;