A company sells its products with a unique serial number on it. Company has has found that there are some products that don’t sell well which are identified to have ominous numbers in the serial number of the product. So if a serial number of the product contains atmost ’k’ ominous number then it won’t sell. Given a range form s to e, you need to find number of products that would sell, leaving out the products that contains atmost ’k’ ominous numbers.
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it called ciper text. only admin known about it. same method are applied on in it
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