## Sunday, December 22, 2019

### A Dasha week

Welcome to the Christmas marathon :)

TopCoder SRM 766 was the first round of the Sep 9 - Sep 15 week (problems, results, top 5 on the left, analysis). With his 44th SRM win, tourist has matched SnapDragon's second place in the record book (he has won two more since that week, but I will tell that slightly sad story later :)). Congratulations!

Codeforces Round 584 followed on Saturday (problems, results, top 5 on the left, my screencast, analysis). Problem F in this round reminded about a nice, if a bit standard, trick: you are given a connected graph with m<=105 edges, numbered with consecutive integers from 1 to m. For any path, we obtain its cost by writing down the numbers of its edges in sequence without spaces to obtain one huge number. What is the smallest cost of a path from vertex 1 to each other vertex? You need to return the costs modulo 109+7 (but the smallest cost is chosen before the modulo).

Open Cup 2019-20 Grand Prix of Warsaw was the last event of the week (problems, results, top 5 on the left, analysis), with another relatively new veteran team taking the top spot: team USA1 shares 2/3 with the last year's team MIT THREE, but this is the first season in the [ICPC] veteran status for them. Congratulations on the win and keep it going!

Thanks for reading, and check back for more.