[理工] [離散]-似乎是鴿籠
題目
A useful feature of black-and-white pictures in the average brightness of
the picture.
Let us say that two pictures are similar if their average brightness differs
by no more than some fixed value. Show that among six pictures,
there are either three that are mutually similar or three that are mutually
dissimilar.
題目沒有很懂
我的理解是
兩張黑白照片的平均brightness差值如果在一個固定的區間內，那就稱為相似
然後要證，六張黑白照片，會有三張照片兩兩相似，或三張照片兩兩不相似
可是我沒有概念要怎麼證 - - 有人願意幫忙嗎 感謝
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