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Code one that runs in proportion to R instead of R and N (i.e. N should be able to be arbitrarily large)

See cpinitiative/usaco-guide#1087

When icpc/ccs-specs#38 is merged, we no longer need the scoreboard.tsv export. We can replace it with something that internally gets the scoreboard API endpoint and downloads it as JSON.

...so admins know which issues still need to be addressed

We sometimes want to run tests which are not associated to specific problems (e.g. generating inputs using srand() and rand(), and check the output with assert()). For this, we can use Hello World as a dummy problem.
However, this technique is not trivial, so we should print hint messages when test files with no PROBLEM

h_1[(i3 + 1)] でなくて h3[i3 + 1] ってなっててほしい

現状:

          std::min<int64_t>(
              x2[i3][1] + std::max<int64_t>(-h_1[(i3 + 1)] + h_1[(i3 + 2)],
                                            h_1[(i3 + 1)] - h_1[(i3 + 2)]),
              x2[i3][0] + std::max<int64_t>(-h_1[i3] + h_1[(i3 + 2)],
                                            h_1[i3] - h_1[(i3 + 2)]))};