from AtCoder Library Practice Contest ACLPC_C C - Floor Sum
- 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
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Find the number of grid points under the line y=(Ax+B)/M
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