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Column-wise backtracking over the letters of the cryptarithm, assigning digits and checking the sum of each column against the target. Registers the exercise in config.json. Verified with bin/verify-exercises-in-docker (the current test runner image) and with V 0.5.2 for bin/test. configlet lint passes, and v fmt -l / v vet are clean on the new files.
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What
Adds the Alphametics practice exercise (difficulty 7), split out of #307.
alphametics.v— stub.meta/example.v— example solutionrun_test.v— 10 tests, built from the canonical data inproblem-specifications.meta/config.json,.meta/tests.toml,.docs/config.json— registers the exerciseColumn-wise backtracking over the letters of the cryptarithm.
One self-contained commit that touches nothing outside the exercise, so it can be merged on its own.
Verification
bin/verify-exercises-in-docker(the currentvlang-test-runnerimage, V 0.4.8): pass, 10/10 tests.vlang/setup-vinstalls forbin/testin CI: pass.configlet lintpasses;v fmt -landv vetare clean on the new files.For the merge commit
Not needed: a brand new exercise does not change the outcome of any existing exercise's tests.