java.lang.ClassCastException: java.lang.Integer
at java.lang.String.compareTo(Unknown Source)
at java.util.TreeMap.compare(Unknown Source)
at java.util.TreeMap.getEntry(Unknown Source)
at java.util.TreeMap.get(Unknown Source)
at metodi.count(metodi.java:148)
at metodi.index(metodi.java:88)
at metodi.main(metodi.java:48)
Exception in thread "main"
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