#05AB1E, 4 bytes

Code:

Ô¹ÙQ 

Explanation:

Ô # Push connected uniquified input. E.g. 111223345565 would give 1234565. ¹ # Push input again. Ù # Uniquify the input. E.g. 111223345565 would give 123456. Q # Check if equal, which yields 1 or 0. 

Uses CP-1252 encoding.

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05AB1E, 4 bytes

Code:

Ô¹ÙQ 

Explanation:

Ô # Push connected uniquified input. E.g. 111223345565 would give 1234565. ¹ # Push input again. Ù # Uniquify the input. E.g. 111223345565 would give 123456. Q # Check if equal, which yields 1 or 0. 

Uses CP-1252 encoding.

Try it online!

#05AB1E, 4 bytes

Code:

Ô¹ÙQ 

Try it online!

#05AB1E, 4 bytes

Code:

Ô¹ÙQ 

Explanation:

Ô # Push connected uniquified input. E.g. 111223345565 would give 1234565. ¹ # Push input again. Ù # Uniquify the input. E.g. 111223345565 would give 123456. Q # Check if equal, which yields 1 or 0. 

Uses CP-1252 encoding.

Try it online!