Contest link: https://codeforces.com/contest/1593
My submissions: https://codeforces.com/submissions/ga...

Apparently I hacked another tester with the test that got myself, got another unexpected verdict, which means either the author's or a tester's solution was hacked too (not on camera this time, though) . Test 15 is mine - any TLE will be my fault. It's just that there's no bound on the sum of K, so an O(tK) solution will probably die.

Timestamps:
Intro 00:00
A (solving) 00:18
B (solving) 02:00
D1 (solving) 05:50
C (solving) 08:31
E (solving) + losing my compiler 13:58
D2 (solving) 21:40
G (solving) 39:00
F (solving) 1:00:00
Contest reflection 1:10:49
A (solution + code) 1:16:32
B (solution + code) 1:18:30
C (solution + code) 1:22:10
D1 (solution + code) 1:28:08
D2 (solution + code) 1:37:50
E (solution + code), and realizing I'm hackable 1:41:08
F (solution + code) 1:49:50
G (solution) 1:54:29
Conclusion 2:01:00