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103台大資工離散第5題
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李昀澤
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Jan 10, 2020, 2:17:03 AM
1/10/20
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to 黃子嘉 - 線代離散研究室
題目: 求 x_1 + x_2 + ... + x_ n = r, 且滿足 1 <= x_1 < x_2 < ... < x_n <= r 之非負整數解;
附圖為網上之參考答案, 但我認為其假設之新條件和原條件感覺不同, 例如取 x_1 = x_2 = 2 時並不滿足原條件?
或是我對他的解法理解有誤呢, 謝謝各位~
1578638453766.jpg
Szem Arnold
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Jan 19, 2020, 9:41:55 PM
1/19/20
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to 黃子嘉 - 線代離散研究室
x_1 , x_2 之間不存在等號喔
呂紹樺
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Mar 9, 2020, 10:38:54 AM
3/9/20
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to 黃子嘉 - 線代離散研究室
你都寫了 "且滿足 1 <= x_1 < x_2 < ... < x_n <= r 之非負整數解"
x_2一定會比x_1 大,x_1 是1的話,x_2必是2以上阿
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