A number having all digits even is called a lucky number. Example 244, 566...
Find Kth lucky number(1st lucky number is 0).
Constraint 1<=k<=10^12
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A number having all digits even is called a lucky number. Example 244, 566...
Find Kth lucky number(1st lucky number is 0).
Constraint 1<=k<=10^12
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isn't it just generating k-th number in base 5 and changing digits?
You were a bit faster :)
One has to present $$$K-1$$$ in quinary number system (with base 5) and double all its digits, that will be the answer.