This problem concerns the so-called balanced ternary system for representing numbers. It is a Base 3 system in which the digits can be 1, 0, or -1.
In balanced ternary, the number 8 would be represented as 9 (or 3^2) minus 1 (or 3^0). Typographically we will use "|" for one, "o" for zero (that's a lower-case O), and "-" for negative one. So if the decimal input d is the number 8, the balanced ternary output is the string "|o-". Thus
dec 8 => bt "|o-"
Here are some more examples.
dec 3 => bt "|o" dec 15 => bt "|--o" dec 52 => bt "|-o-|"
Given an integer d, return the string bt. Leading zeros should always be suppressed.
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