We have unweighted undirected graph with n vertices and m edges (n < 1e5, m < 1e6). You need to find sum of d(u, v) over all pairs of u v, where d(u, v) — minimal distance between u and v.
# | User | Rating |
---|---|---|
1 | tourist | 3757 |
2 | jiangly | 3647 |
3 | Benq | 3581 |
4 | orzdevinwang | 3570 |
5 | Geothermal | 3569 |
5 | cnnfls_csy | 3569 |
7 | Radewoosh | 3509 |
8 | ecnerwala | 3486 |
9 | jqdai0815 | 3474 |
10 | gyh20 | 3447 |
# | User | Contrib. |
---|---|---|
1 | maomao90 | 171 |
2 | awoo | 165 |
3 | adamant | 163 |
4 | TheScrasse | 159 |
5 | maroonrk | 155 |
6 | nor | 154 |
7 | -is-this-fft- | 152 |
8 | Petr | 147 |
9 | orz | 146 |
10 | pajenegod | 145 |
We have unweighted undirected graph with n vertices and m edges (n < 1e5, m < 1e6). You need to find sum of d(u, v) over all pairs of u v, where d(u, v) — minimal distance between u and v.
Name |
---|
I have a certain problem in a previous contest in mind, almost exactly same with this problem, only difference being the constraints for $$$m$$$. Can you please state the source of this problem?
It was on a Belarusian National Olympiad in 2009...
Okay, the problem I was thinking of was "Distance Sum", NERC 2018. The problem was authored by tourist, so he should be able to help better than I can. Good luck on solving the problem.