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import std/[sugar, unittest]
from std/math import sqrt
from std/sequtils import map, toSeq
# run tests with following command:
# nim c -r ch_1.nim
proc three_power(n: Natural): bool =
let
powers = map(toSeq(0..int(sqrt(to!float(n)))), x => x * x * x)
return n in powers
suite "three power":
test "27":
check(three_power(27) == true)
test "0":
check(three_power(0) == true)
test "6":
check(three_power(6) == false)
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