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Not able to understand the formula given in editorial
In english tutorial of https://codeforces.net/contest/460/problem/A, it is given that answer can be calculated using formula
, but I am not able to understand how we reached at this formula. Please help me in this.
Here is my accepted submission , but my solution will exceed time limit if value of n is very large. Fortunately in this question input size limit is very small, hence my solution works.
| Rev. | Язык | Кто | Когда | Δ | Комментарий | |
|---|---|---|---|---|---|---|
| en5 |
|
shinghalrishabh | 2020-04-11 15:17:21 | 0 | (published) | |
| en4 |
|
shinghalrishabh | 2020-04-11 15:16:52 | 70 | ||
| en3 |
|
shinghalrishabh | 2020-04-11 15:13:20 | 1 | Tiny change: 'very small hence my ' -> 'very small, hence my ' (saved to drafts) | |
| en2 |
|
shinghalrishabh | 2020-04-11 15:07:28 | 61 | ||
| en1 |
|
shinghalrishabh | 2020-04-11 15:06:22 | 597 | Initial revision (published) |
