Ruby1.9用．プロコンなどで便利かも．
"1 1 2 3 5 8 13 21".split.map(&:to_i)
# => [1, 1, 2, 3, 5, 8, 13, 21]
# 多重代入との組み合せ
w, h = "30 35".split.map(&:to_i)
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