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-- !!! Test getCPUTime
import System.CPUTime
import System.IO
main :: IO ()
main = do
t28 <- timeFib 28
t29 <- timeFib 29
t30 <- timeFib 30
print (t28 <= t29, t29 <= t30)
timeFib :: Integer -> IO Integer
timeFib n = do
start <- getCPUTime
print (nfib n)
end <- getCPUTime
return (end - start)
nfib :: Integer -> Integer
nfib n
| n <= 1 = 1
| otherwise = (n1 + n2 + 1)
where
n1 = nfib (n-1)
n2 = nfib (n-2)
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