Problem 324. 7 segment LED display

Created by Alan Chalker

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Given a whole number, output how many segments would be lit up to display it on a 7 segment LED display (see Wikipedia: http://en.wikipedia.org/wiki/Seven-segment_display)
Examples:
1 -> 2
34 -> 9

Solve

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658 Solutions
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Last Solution submitted on Dec 18, 2025

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goc3 on 2 Jan 2018

Additional test cases have been added.

TurqoiseInt on 22 Jan 2018

How to pass test 15, I see only integer converted to float in my function, then back to the int64 is too late, I have lost last digit.

Hannes on 13 Feb 2018

In addition to the remark of TurqoiseInt, y_correct seems to be wrong for test 15. I guess y_correct = 86 assumes x = 12345678987654000.

Sergey Kasyanov on 11 Apr 2018

Test 15 is wrong. True number of segment in number 12345678987654321 is 80. If last digit is losted then true number become 84. In this test correct answer is 86. Maybe it is misprint?

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