Problems are not stop signs; they are guidelines.
問(wèn)題的出現(xiàn)不是讓你止步,而是給你指路。———— Robert Schuller
收藏下這些小程序,以后可能會(huì)用到~ 經(jīng)網(wǎng)友 Rming 的指正,由之前的ceil函數(shù)修改為floor函數(shù)。~