驚いた 頭の体操ポパイの算数幼児でも解ける算数 簡単?難問?幼児でも解ける算数問題!頭を柔らかくして考えてね! This problem can be solved by pre-school children in five to ten minutes, by programmers in an hour ... 2015.1.19 FUNDO(KUSUTA)