find the nth digit
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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