Compile Error
[1 of 1] Compiling Main ( foo.hs, /tmp/Main.o )
foo.hs:3:17:
No instance for (Num String) arising from a use of `+'
In the second argument of `($)', namely `a + b'
In a stmt of a 'do' block: putStrLn $ a + b
In the expression:
do { [a, b] <- (map read . words) `fmap` getLine;
putStrLn $ a + b }
自豪的采用 HydroJudge 进行评测(github.com/hydro-dev/HydroJudge)
