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He is talking about map.containsValue NOT containsKey. So you basically have to iterate through the map to know whether desired value is present in the map or not. And that's O(n). where n is the number of keys present in the map.
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He is talking about map.containsValue NOT containsKey. So you basically have to iterate through the map to know whether desired value is present in the map or not. And that's O(n). where n is the number of keys present in the map.