find the nth digit(數論)

阿新 • • 發佈：2019-02-17

假設：


S1 = 1


S2 = 12


S3 = 123


S4 = 1234


.........


S9 = 123456789


S10 = 1234567891


S11 = 12345678912


............


S18 = 123456789123456789


..................


現在我們把所有的串連線起來


S = 1121231234.......123456789123456789112345678912.........


那麼你能告訴我在S串中的第N個數字是多少嗎？

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假設： S1 = 1 S2 = 12 S3 = 123 S4 = 1234 ......... S9 = 123456789 S10 = 1234567891 S11 = 12345678912

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find the nth digit(數論)

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