1:05:38完全不懂 全部還給老師:face-blue-smiling::face-blue-smiling:
1:07:29:face-red-heart-shape::face-red-heart-shape::face-red-heart-shape:
1:07:49:face-red-heart-shape::face-red-heart-shape::face-red-heart-shape:
1:09:39:face-red-heart-shape::face-red-heart-shape::face-red-heart-shape:
1:09:47:finger-red-number-one::finger-red-number-one:
1:09:56:face-red-heart-shape::face-red-heart-shape:
他
1:11:34反過來不行,群組不論順序,所以他會包含A+B、B+A的群組,但這兩個是同一個,所以n!-1會出現大量重複群組,要的話只能用2^n -n -1這樣速算,扣掉0人跟1人的狀況
1:12:05(≧ω≦):clapping_hands::clapping_hands::clapping_hands::clapping_hands:
1:12:17:clapping_hands::clapping_hands::clapping_hands:
1:12:32不對 好像是C3取3+C3取2+C3取1-1:_CLAP::_CLAP::_CLAP: