Project Euler

Personal solutions to Project Euler problems, written mainly in Go with some accompanying JavaScript.

Structure

Tasks are grouped in decades of folders (tasks_001-010, tasks_011-020, tasks_021-030, ...).

tasks_001-010 uses the current, expected layout — each task lives in its own zero-padded folder:

tasks_001-010/task_001/
├── README.md   # problem statement and link to projecteuler.net
├── go/         # solution(s), tests, and benchmark results
└── js/         # solution(s) in JavaScript

tasks_011-020 and tasks_021-030 still hold an older, ad hoc structure (standalone .js files/folders, no README, no Go). These get migrated to the layout above one task at a time as each is revisited.

Tests

Each Go solution has a _test.go file with table-driven test cases. Run everything:

go test ./...

Run a single task:

go test ./tasks_001-010/task_001/go -v

A passing test means the solution produces the correct answer for the known sample/check values; it does not by itself guarantee the code is efficient — see benchmarks below for that.

Benchmarks

Each task's go/benchmark.txt holds the last recorded go test -bench output (ops/sec, ns/op, memory allocations) for that solution, useful for comparing alternative approaches to the same problem. Regenerate it for a single task with the Taskfile.yml at the repo root, passing the task number:

task benchmark -- 11

This resolves the task number to its tasks_XXX-YYY/task_NNN/go folder, runs go test -bench=. -benchmem, and writes the result to that task's go/benchmark.txt.

Lower ns/op and fewer allocs/op are better — use it to compare solutions to the same task, not across different tasks.