[問題] 數甲問題 拜託神人求解
如圖
詳解看了還是看不懂
不知為啥小於0
有大大能幫忙解說嗎
有回有保庇
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推
07/01 19:00, , 1F
07/01 19:00, 1F
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07/01 19:02, , 2F
07/01 19:02, 2F
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07/01 19:03, , 3F
07/01 19:03, 3F
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07/01 19:03, , 4F
07/01 19:03, 4F
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07/01 19:08, , 5F
07/01 19:08, 5F
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07/01 19:11, , 6F
07/01 19:11, 6F
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07/01 19:11, , 7F
07/01 19:11, 7F
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07/01 19:11, , 8F
07/01 19:11, 8F
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07/01 19:30, , 9F
07/01 19:30, 9F
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07/01 19:47, , 10F
07/01 19:47, 10F
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07/01 19:47, , 11F
07/01 19:47, 11F
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07/01 19:47, , 12F
07/01 19:47, 12F
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07/01 20:51, , 13F
07/01 20:51, 13F
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07/01 21:34, , 14F
07/01 21:34, 14F