| # | User | Rating |
|---|---|---|
| 1 | tourist | 4009 |
| 2 | jiangly | 3831 |
| 3 | Radewoosh | 3646 |
| 4 | jqdai0815 | 3620 |
| 4 | Benq | 3620 |
| 6 | orzdevinwang | 3529 |
| 7 | ecnerwala | 3446 |
| 8 | Um_nik | 3396 |
| 9 | gamegame | 3386 |
| 10 | ksun48 | 3373 |
| # | User | Contrib. |
|---|---|---|
| 1 | cry | 164 |
| 1 | maomao90 | 164 |
| 3 | Um_nik | 163 |
| 4 | atcoder_official | 160 |
| 5 | -is-this-fft- | 158 |
| 6 | awoo | 157 |
| 7 | adamant | 156 |
| 8 | TheScrasse | 154 |
| 8 | nor | 154 |
| 10 | Dominater069 | 153 |
I want to get nth digit of the lucky string . Lucky string is made by the concatenation of lucky digits i.e. 4 and 7 in the increasing order . Thus lucky string is 4744477477444.... and so on.
Value of n is of the order 10^15 .
How to solve this type of problem ? Is there any DP solution ?
Example : n=1 ans is 4 . n=10 ans is 4.
Please increase the frequency of contests , and list the upcoming contests of the month at the beginning of the month . Its hurts to see 'No contests' in the Contests tab .
-A wannabe coder
