ACLPC C
from AtCoder Library Practice Contest
ACLPC_C
C - Floor Sum
https://gyazo.com/93cb826c504be76e1238ebb8f1dd9e6a
floor_sum What kind of application is a mystery
Calculate recursively
Ah, I see, it's the number of grid points under the line.
https://twitter.com/kyopro_friends/status/1304063876019793921?s=21
Find the number of grid points under the line y=(Ax+B)/M
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