題目計算1加到n的總和，例如: n為10，總和為1+2+3+4+5+6+7+8+9+10=55。 解法一時間複雜度: O(n) 12345678910111213141516171819202122232425262728293031"""透過數學累加方式進行計算總和若n=10計算方式:0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 55步驟1 => total + 1 => 0 + 1 = 1步驟2 => total + 2 => 1 + 2 = 3步驟3 => total + 3 => 3 + 3 = 6步驟4 => total + 4 => 6 + 4 = 10步驟5 => total + 5 => 10 + 5 = 15步驟6 => total + 6 => 15 + 6 = 21步驟7 => total + 7 => 21 + 7 = 28步驟8 => total + 8 => 28 + 8 = 3 ...

題目給定一個字串，列印出所有可能的組合，例如: abc -> aaa, aab, aac, aba, abb, abc, aca, acb, acc, baa, bab, bac, bba, bbb, bbc, bca, bcb, bcc, caa, cab, cac,cba, cbb, cbc, cca, ccb, ccc 解法一123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110"""思路in_put = 'abc'n = 3個字元組合數量 = n^n = 3^3 = 27Big O: O(n^n)"""def ...

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